mongo 2.0.0 primary saturates CPU

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Dan Spinosa

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Sep 14, 2011, 11:21:43 AM9/14/11

to mongodb-user

-Background-

I recently upgraded 1.8.2 to 2.0.0. Had to re-sync my secondary from
scratch (my own fault - third in set is an arbiter). Upon resync, not
all indexes on secondary were v:1 (three bugs have been filed by Tony
Hannan). Have not taken any further action to re-index. Things
seemed to be working fine for a while; rs.status(), mongostat, iostat,
top on both machines all looked healthy...

-Issue-

At some point (late evening, of course) all client connections started
failing and then wouldn't connect. Running `top` on the primary
server showed mondgod using normal memory but 200% CPU (on a 4 CPU
quad-core rackspace cloud machine w/ 15GB ram allocated to my image).
From the secondary, rs.status() reporting the following errors for
primary:

>>>>
{
"_id" : 0,
"name" : "dba:27017",
"health" : 0,
"state" : 8,
"stateStr" : "(not reachable/healthy)",
"uptime" : 0,
"optime" : {
"t" : 1315969591000,
"i" : 145
},
"optimeDate" : ISODate("2011-09-14T03:06:31Z"),
"lastHeartbeat" : ISODate("2011-09-14T03:06:59Z"),
"pingMs" : 0,
"errmsg" : "DBClientBase::findN: transport error: dba:27017 query:
{ replSetHeartbeat: \"shelbySet\", v: 7, pv: 1, checkEmpty: false,
from: \"dbb:27018\" }"
}
<<<<

Grepping the primary's logs for "transport" I thought this might be
useful:

>>>>
Wed Sep 14 02:48:26 [conn12857] warning: virtual size (345785MB) -
mapped size (340604MB) is large. could indicate a memory leak
...
Wed Sep 14 02:49:49 [rsHealthPoll] DBClientCursor::init call() failed
Wed Sep 14 02:49:49 [rsHealthPoll] replSet info dbb:27018 is down (or
slow to respond): DBClientBase::findN: transport error: dbb:27018
query: { replSetHeartbeat: "shelbySet", v: 7, pv: 1, checkEmpty:
false, from: "dba:27017" }
Wed Sep 14 02:49:49 [rsHealthPoll] replSet member dbb:27018 is now in
state DOWN
<<<<

A simple restart of the primary db worked and the problem has not
reappeared in the last 12 hours.

Any ideas what could be going on/wrong or what you need to further
debug?

Thanks,
d...@shelby.tv

Eliot Horowitz

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Sep 14, 2011, 1:28:39 PM9/14/11

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Can you send more of the logs?
A common cause is running out of file descriptors.

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Dan Spinosa

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Sep 14, 2011, 3:17:51 PM9/14/11

to mongodb-user

Sure, here are 100 lines before and after the line with
"DBClientBase::findN" ... [Thanks Eliot]

Wed Sep 14 02:39:33 [initandlisten] connection accepted from lp2:36100
#12775
Wed Sep 14 02:39:33 [initandlisten] connection accepted from lp2:36101
#12776
Wed Sep 14 02:39:33 [initandlisten] connection accepted from lp2:36102
#12777
Wed Sep 14 02:40:16 [initandlisten] connection accepted from lp2:36105
#12778
Wed Sep 14 02:40:16 [conn12777] end connection lp2:36105
Wed Sep 14 02:40:37 [initandlisten] connection accepted from lp2:36108
#12779
Wed Sep 14 02:41:04 [initandlisten] connection accepted from lp2:36109
#12780
Wed Sep 14 02:41:04 [initandlisten] connection accepted from lp2:36110
#12781
Wed Sep 14 02:47:10 [initandlisten] connection accepted from lp2:35598
#12782
Wed Sep 14 02:47:10 [conn12781] end connection lp2:35598
Wed Sep 14 02:47:31 [initandlisten] connection accepted from lp2:35601
#12783
Wed Sep 14 02:47:37 [initandlisten] connection accepted from lp2:35657
#12784
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35678
#12785
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35679
#12786
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35680
#12787
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35681
#12788
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35682
#12789
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35683
#12790
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35684
#12791
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35685
#12792
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35686
#12793
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35687
#12794
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35688
#12795
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35689
#12796
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35690
#12797
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35691
#12798
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35692
#12799
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35693
#12800
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35694
#12801
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35695
#12802
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35696
#12803
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35697
#12804
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35698
#12805
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35699
#12806
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35700
#12807
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35701
#12808
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35702
#12809
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35703
#12810
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35704
#12811
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35705
#12812
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35706
#12813
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35707
#12814
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35708
#12815
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35709
#12816
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35710
#12817
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35711
#12818
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35712
#12819
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35713
#12820
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35714
#12821
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35715
#12822
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35716
#12823
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35717
#12824
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35718
#12825
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35719
#12826
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35720
#12827
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35721
#12828
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35722
#12829
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35723
#12830
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35724
#12831
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35725
#12832
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35726
#12833
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35727
#12834
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35728
#12835
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35729
#12836
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35730
#12837
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35731
#12838
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35732
#12839
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35733
#12840
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35734
#12841
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35735
#12842
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35736
#12843
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35737
#12844
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35738
#12845
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35739
#12846
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35740
#12847
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35741
#12848
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35742
#12849
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35743
#12850
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35744
#12851
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35745
#12852
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35746
#12853
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35747
#12854
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35748
#12855
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35749
#12856
Wed Sep 14 02:47:38 [initandlisten] connection accepted from lp2:35750
#12857
Wed Sep 14 02:48:20 [initandlisten] connection accepted from
127.0.0.1:35944 #12858
Wed Sep 14 02:48:20 [conn12857] warning: virtual size (345785MB) -

mapped size (340604MB) is large. could indicate a memory leak

Wed Sep 14 02:48:21 [conn12857] warning: virtual size (345785MB) -

mapped size (340604MB) is large. could indicate a memory leak

Wed Sep 14 02:48:22 [conn12857] warning: virtual size (345785MB) -

mapped size (340604MB) is large. could indicate a memory leak

Wed Sep 14 02:48:23 [conn12857] warning: virtual size (345785MB) -

mapped size (340604MB) is large. could indicate a memory leak

Wed Sep 14 02:48:24 [conn12857] warning: virtual size (345785MB) -

mapped size (340604MB) is large. could indicate a memory leak

Wed Sep 14 02:48:25 [conn12857] warning: virtual size (345785MB) -

mapped size (340604MB) is large. could indicate a memory leak
Wed Sep 14 02:48:26 [conn12857] warning: virtual size (345785MB) -
mapped size (340604MB) is large. could indicate a memory leak

Wed Sep 14 02:48:27 [conn12857] end connection 127.0.0.1:35944
Wed Sep 14 02:48:28 [initandlisten] connection accepted from lp1:60228
#12859
Wed Sep 14 02:48:28 [conn12858] end connection lp1:60228
Wed Sep 14 02:48:29 [initandlisten] connection accepted from
127.0.0.1:35945 #12860
Wed Sep 14 02:48:49 [initandlisten] connection accepted from lp1:60231
#12861
Wed Sep 14 02:49:47 [conn4] end connection dbb:52961

Wed Sep 14 02:49:49 [rsHealthPoll] DBClientCursor::init call() failed
Wed Sep 14 02:49:49 [rsHealthPoll] replSet info dbb:27018 is down (or
slow to respond): DBClientBase::findN: transport error: dbb:27018
query: { replSetHeartbeat: "shelbySet", v: 7, pv: 1, checkEmpty:
false, from: "dba:27017" }
Wed Sep 14 02:49:49 [rsHealthPoll] replSet member dbb:27018 is now in
state DOWN

Wed Sep 14 02:50:05 [conn12859] end connection 127.0.0.1:35945
Wed Sep 14 02:50:17 [initandlisten] connection accepted from lp2:33723
#12862
Wed Sep 14 02:50:17 [conn12861] end connection lp2:33723
Wed Sep 14 02:50:17 got kill or ctrl c or hup signal 15 (Terminated),
will terminate after current cmd ends

***** SERVER RESTARTED *****

Wed Sep 14 02:51:11 [initandlisten] MongoDB starting : pid=12324
port=27017 dbpath=/var/lib/mongodb 64-bit host=nos-db
Wed Sep 14 02:51:11 [initandlisten] db version v2.0.0, pdfile version
4.5
Wed Sep 14 02:51:11 [initandlisten] git version:
695c67dff0ffc361b8568a13366f027caa406222
Wed Sep 14 02:51:11 [initandlisten] build info: Linux bs-
linux64.10gen.cc 2.6.21.7-2.ec2.v1.2.fc8xen #1 SMP Fri Nov 20 17:48:28
EST 2009 x86_64 BOOST_LIB_VERSION=1_41
Wed Sep 14 02:51:11 [initandlisten] options: { config: "/etc/
mongodb.conf", dbpath: "/var/lib/mongodb", journal: true, logappend:
"true", logpath: "/var/log/mongodb/mongodb.log", noauth: "true", port:
27017, replSet: "shelbySet", shardsvr: true }
Wed Sep 14 02:51:11 [initandlisten] journal dir=/var/lib/mongodb/
journal
Wed Sep 14 02:51:11 [initandlisten] recover begin
Wed Sep 14 02:51:11 [initandlisten] recover lsn: 25091670
Wed Sep 14 02:51:11 [initandlisten] recover /var/lib/mongodb/journal/
j._0
Wed Sep 14 02:51:11 [initandlisten] recover skipping application of
section seq:0 < lsn:25091670
Wed Sep 14 02:51:11 [initandlisten] recover skipping application of
section seq:47722 < lsn:25091670
Wed Sep 14 02:51:11 [initandlisten] recover skipping application of
section seq:106798 < lsn:25091670
Wed Sep 14 02:51:11 [initandlisten] recover skipping application of
section seq:163205 < lsn:25091670
Wed Sep 14 02:51:11 [initandlisten] recover skipping application of
section seq:221923 < lsn:25091670
Wed Sep 14 02:51:11 [initandlisten] recover skipping application of
section seq:281229 < lsn:25091670
Wed Sep 14 02:51:11 [initandlisten] recover skipping application of
section seq:340583 < lsn:25091670
Wed Sep 14 02:51:11 [initandlisten] recover skipping application of
section seq:399931 < lsn:25091670
Wed Sep 14 02:51:11 [initandlisten] recover skipping application of
section seq:458857 < lsn:25091670
Wed Sep 14 02:51:12 [initandlisten] recover skipping application of
section more...
Wed Sep 14 02:51:17 [initandlisten] recover /var/lib/mongodb/journal/
j._1
Wed Sep 14 02:51:23 [initandlisten] recover cleaning up
Wed Sep 14 02:51:23 [initandlisten] removeJournalFiles
Wed Sep 14 02:51:23 [initandlisten] recover done
Wed Sep 14 02:51:24 [websvr] admin web console waiting for connections
on port 28017
Wed Sep 14 02:51:24 [initandlisten] waiting for connections on port
27017
Wed Sep 14 02:51:24 [initandlisten] connection accepted from
127.0.0.1:48581 #1
Wed Sep 14 02:51:24 [initandlisten] connection accepted from
api1:50254 #2
Wed Sep 14 02:51:25 [conn2] command nos-production.$cmd command:
{ ismaster: 1 } ntoreturn:1 reslen:160 309ms
Wed Sep 14 02:51:25 [rsStart] replSet STARTUP2
Wed Sep 14 02:51:25 [rsHealthPoll] couldn't connect to dbb:27018:
couldn't connect to server dbb:27018
Wed Sep 14 02:51:25 [rsHealthPoll] replSet info dbb:27018 is down (or
slow to respond): socket exception
Wed Sep 14 02:51:25 [rsHealthPoll] replSet member dbb:27018 is now in
state DOWN
Wed Sep 14 02:51:25 [rsSync] replSet SECONDARY
Wed Sep 14 02:51:25 [initandlisten] connection accepted from app:42058
#3
Wed Sep 14 02:51:26 [initandlisten] connection accepted from app:42060
#4
Wed Sep 14 02:51:26 [conn4] end connection app:42060
Wed Sep 14 02:51:27 [initandlisten] connection accepted from
api1:50257 #5
Wed Sep 14 02:51:27 [conn5] end connection api1:50257
Wed Sep 14 02:51:27 [rsHealthPoll] replSet info member app:27017 is up
Wed Sep 14 02:51:27 [rsHealthPoll] replSet member app:27017 is now in
state ARBITER
Wed Sep 14 02:51:27 [rsMgr] not electing self, app:27017 would veto
Wed Sep 14 02:51:33 [rsMgr] replSet info electSelf 0
Wed Sep 14 02:51:33 [rsMgr] replSet PRIMARY
Wed Sep 14 02:51:36 [initandlisten] connection accepted from
127.0.0.1:48591 #6
Wed Sep 14 02:51:38 [initandlisten] connection accepted from app:42073
#7
Wed Sep 14 02:51:38 [conn7] end connection app:42073
Wed Sep 14 02:51:38 [initandlisten] connection accepted from app:42076
#8
Wed Sep 14 02:51:42 [conn6] end connection 127.0.0.1:48591
Wed Sep 14 02:51:42 [initandlisten] connection accepted from app:42080
#9
Wed Sep 14 02:51:42 [conn9] end connection app:42080
Wed Sep 14 02:51:42 [initandlisten] connection accepted from app:42082
#10
Wed Sep 14 02:51:42 [initandlisten] connection accepted from app:42084
#11
Wed Sep 14 02:51:42 [conn11] end connection app:42084
Wed Sep 14 02:51:42 [initandlisten] connection accepted from app:42086
#12
Wed Sep 14 02:51:43 [initandlisten] connection accepted from app:42088
#13
Wed Sep 14 02:51:43 [conn13] end connection app:42088
Wed Sep 14 02:51:43 [initandlisten] connection accepted from app:42090
#14
Wed Sep 14 02:51:43 [initandlisten] connection accepted from app:42092
#15
Wed Sep 14 02:51:43 [conn15] end connection app:42092
Wed Sep 14 02:51:43 [initandlisten] connection accepted from app:42094
#16
Wed Sep 14 02:51:43 [initandlisten] connection accepted from app:42096
#17
Wed Sep 14 02:51:43 [conn17] end connection app:42096
Wed Sep 14 02:51:43 [initandlisten] connection accepted from app:42098
#18
Wed Sep 14 02:51:43 [initandlisten] connection accepted from app:42100
#19
Wed Sep 14 02:51:43 [conn19] end connection app:42100
Wed Sep 14 02:51:43 [initandlisten] connection accepted from app:42102
#20
Wed Sep 14 02:51:44 [initandlisten] connection accepted from
127.0.0.1:48596 #21
Wed Sep 14 02:51:53 [initandlisten] connection accepted from dbb:51929
#22
Wed Sep 14 02:51:55 [rsHealthPoll] replSet info member dbb:27018 is up
Wed Sep 14 02:51:55 [rsHealthPoll] replSet member dbb:27018 is now in
state SECONDARY
Wed Sep 14 02:52:00 [initandlisten] connection accepted from dbb:51930
#23
Wed Sep 14 02:52:16 [initandlisten] connection accepted from lp1:54772
#24
Wed Sep 14 02:52:16 [conn24] end connection lp1:54772
Wed Sep 14 02:52:17 [initandlisten] connection accepted from lp2:33737
#25
Wed Sep 14 02:52:17 [conn25] end connection lp2:33737
Wed Sep 14 02:52:18 [initandlisten] connection accepted from app:42116
#26
Wed Sep 14 02:52:18 [conn26] end connection app:42116
Wed Sep 14 02:52:18 [initandlisten] connection accepted from app:42119
#27
Wed Sep 14 02:52:18 [initandlisten] connection accepted from lp1:54775
#28
Wed Sep 14 02:52:18 [conn28] end connection lp1:54775
Wed Sep 14 02:52:19 [initandlisten] connection accepted from lp2:33740
#29
Wed Sep 14 02:52:19 [conn29] end connection lp2:33740
Wed Sep 14 02:52:21 [initandlisten] connection accepted from lp2:33743
#30
Wed Sep 14 02:52:21 [conn30] end connection lp2:33743
Wed Sep 14 02:52:22 [initandlisten] connection accepted from lp2:33746
#31
Wed Sep 14 02:52:22 [conn31] end connection lp2:33746
Wed Sep 14 02:52:22 [conn27] end connection app:42119
Wed Sep 14 02:52:23 [initandlisten] connection accepted from app:42121
#32
Wed Sep 14 02:52:23 [conn32] end connection app:42121
Wed Sep 14 02:52:23 [initandlisten] connection accepted from app:42123
#33

Mathias Stearn

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Sep 14, 2011, 6:52:25 PM9/14/11

to mongod...@googlegroups.com

Did you run reIndex on the secondary? If so, we found an unfortunate bug with that: https://jira.mongodb.org/browse/SERVER-3866

Eliot Horowitz

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Sep 15, 2011, 12:46:01 AM9/15/11

to mongod...@googlegroups.com

Was there any other message during shutdown?
If it happens again, can you send db.currentOp()?

Dan Spinosa

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Sep 15, 2011, 9:23:44 AM9/15/11

to mongodb-user

Mathias - I did resync the secondary from scratch, which caused some
v0 and some v1 indexes on the secondary, but they're all there. The
primary still has all v0 indexes (though when you do a
db.coll.getIndexes() some of them show v:0 and some don't show a v
field at all). Assuming that's not causing issues (?)

Eliot - Just a db.currentOp() or db.currentOp(true)? It happened
again last night, but before your reply.

Thanks,

> ...
>
> read more »

Dan Spinosa

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Sep 15, 2011, 10:42:14 AM9/15/11

to mongodb-user

Mongo just jumped to 200% CPU usage while I was running mongostat.
Here are some of the last lines before mongostat hung:

insert query update delete getmore command flushes mapped vsize
res faults locked % idx miss % qr|qw ar|aw netIn netOut
conn set repl time
0 230 205 0 6 3 0 168g 338g
1.28g 70 16 0 0|0 0|0 181k 354k 289
shelbySet M 14:18:54
0 161 139 0 1 1 0 168g 338g
1.28g 11 0.3 0 118|120 120|119 20k 39k 289
shelbySet M 14:18:55
0 154 111 0 0 3 0 168g 338g
1.29g 63 22 0 0|95 18|94 128k 197k 289
shelbySet M 14:18:56
0 265 222 0 0 1 0 168g 338g
1.28g 83 21.5 0 14|35 22|35 242k 232k 289
shelbySet M 14:18:57
0 232 200 0 0 3 0 168g 338g
1.29g 63 17 0 2|4 3|4 255k 849k 289
shelbySet M 14:18:58
0 236 170 0 32 2 0 168g 338g
1.29g 60 20.6 0 0|0 1|0 239k 806k 289
shelbySet M 14:18:59
0 209 164 0 3 2 0 168g 338g
1.28g 87 22.7 5.2 9|33 9|34 186k 361k 289
shelbySet M 14:19:00
0 143 140 0 13 2 0 168g 338g
1.29g 44 18.9 0 0|0 0|0 210k 502k 289
shelbySet M 14:19:01
0 190 201 0 2 3 0 168g 338g
1.29g 71 28.4 0 0|1 0|2 211k 338k 290
shelbySet M 14:19:02
0 142 105 0 23 2 0 168g 338g
1.29g 41 11.2 0 35|19 36|19 83k 148k 290
shelbySet M 14:19:03
insert query update delete getmore command flushes mapped vsize
res faults locked % idx miss % qr|qw ar|aw netIn netOut
conn set repl time
0 175 160 0 26 2 0 168g 338g
1.29g 55 22.6 4.1 0|0 1|0 196k 305k 289
shelbySet M 14:19:04
0 106 77 0 22 2 0 168g 338g
1.29g 34 10.1 0 2|4 3|4 64k 127k 289
shelbySet M 14:19:05
0 175 141 0 31 2 0 168g 338g
1.28g 40 15.4 0 0|0 0|0 119k 196k 289
shelbySet M 14:19:06
0 168 121 0 48 2 0 168g 338g
1.28g 21 2.4 0 3|8 4|8 83k 174k 290
shelbySet M 14:19:07
0 233 126 0 41 2 0 168g 338g
1.28g 47 9.4 0 5|3 6|3 108k 256k 359
shelbySet M 14:19:08

I had just started another background process that does some heavy DB
querying; you'll notice the connections move from a steady 290 to 359
just before hang.

The mongo shell just hangs after "connecting to: test" so I'm unable
to run db.currentOp().

The dead primaries logs just show normal queries and the new
connection; have not received any updates since CPU saturation.

rs.status() on secondary (now primary) shows the following for the
dead primary:

{
"_id" : 0,
"name" : "dba:27017",
"health" : 0,
"state" : 8,
"stateStr" : "(not reachable/healthy)",
"uptime" : 0,
"optime" : {

"t" : 1316096347000,
"i" : 96
},
"optimeDate" : ISODate("2011-09-15T14:19:07Z"),
"lastHeartbeat" : ISODate("2011-09-15T14:19:11Z"),
"pingMs" : 0,
"errmsg" : "DBClientBase::findN: transport error: dba:27017 query:

{ replSetHeartbeat: \"shelbySet\", v: 7, pv: 1, checkEmpty: false,

from: \"dbb:27018\" }"
}

A graceful restart of mongod resolved the hang. Mongod recovered from
journal (didn't have to apply any sections), went SECONDARY then
ROLLBACK, rolled back to find common point, went SECONDARY, then I had
the other primary step down and this one came back as PRIMARY.

What else can I do to help get to the bottom of this?

Thanks,

> ...
>
> read more »

Dan Spinosa

unread,

Sep 15, 2011, 12:51:30 PM9/15/11

to mongodb-user

As performance starts to degrade, I've noticed very slow operations
via db.currentOp() - all like this one:

{
"opid" : 1360907,
"active" : true,
"lockType" : "read",
"waitingForLock" : true,
"secs_running" : 135,
"op" : "query",
"ns" : "nos-production.users",
"query" : {
"authentications.provider" : "twitter",
"authentications.uid" : "19312115"
},
"client" : "10.180.164.129:48912",
"desc" : "conn",
"threadId" : "0x7f8dcd7d7700",
"connectionId" : 1165,
"numYields" : 298
}

The explain for the above looks like:

PRIMARY> db.users.find({"authentications.provider" : "twitter",
"authentications.uid" : "19312115"}).explain()
{
"cursor" : "BtreeCursor
authentications.provider_1_authentications.uid_1",
"nscanned" : 1480,
"nscannedObjects" : 1480,
"n" : 1,
"millis" : 2038,
"nYields" : 9,
"nChunkSkips" : 0,
"isMultiKey" : true,
"indexOnly" : false,
"indexBounds" : {
"authentications.provider" : [
[
"twitter",
"twitter"
]
],
"authentications.uid" : [
[
{
"$minElement" : 1
},
{
"$maxElement" : 1
}
]
]
}
}

The compound index covering that query looks like:

{
"name" : "authentications.provider_1_authentications.uid_1",
"ns" : "nos-production.users",
"key" : {
"authentications.provider" : 1,
"authentications.uid" : 1
},
"background" : true,
"v" : 0
}

Is it normal for nscanned to be so high when covered by an index like
this?

> ...
>
> read more »

Mathias Stearn

unread,

Sep 15, 2011, 1:04:37 PM9/15/11

to mongod...@googlegroups.com

Try this:

db.users.find({"authentications" : {$elemMatch: {"provider" : "twitter", "uid" : "19312115"}}).explain()

Dan Spinosa

unread,

Sep 15, 2011, 3:26:32 PM9/15/11

to mongodb-user

Thanks, Mathias.

Same results querying per your suggestion (below). Is this normal? I
would expect the min/max on authentications.uid to narrow the query
down a bit more... unless that collection is so small (2k docs) the
BTree hasn't split it further?

SECONDARY> db.users.find({"authentications" : {$elemMatch:

{"provider" : "twitter", "uid" : "19312115"}}}).explain()

{
"cursor" : "BtreeCursor
authentications.provider_1_authentications.uid_1",
"nscanned" : 1481,
"nscannedObjects" : 1481,
"n" : 1,
"millis" : 48,
"nYields" : 2,

"nChunkSkips" : 0,
"isMultiKey" : true,
"indexOnly" : false,
"indexBounds" : {
"authentications.provider" : [
[
"twitter",
"twitter"
]
],
"authentications.uid" : [
[
{
"$minElement" : 1
},
{
"$maxElement" : 1
}
]
]
}
}

Dan Spinosa

unread,

Sep 20, 2011, 4:51:02 PM9/20/11

to mongodb-user, Eliot Horowitz

Secondary just pegged CPU again; noticed something very strange in the
logs just before the restart:

<bunch of seemingly normal stuff>...
Tue Sep 20 20:20:23 [initandlisten] connection accepted from
192.168.100.192:35044 #2572
Tue Sep 20 20:20:23 [initandlisten] connection accepted from
192.168.100.192:35047 #2573
d Sep 7 02:40:00 [replica set sync] nos-production Btree::insert

***** SERVER RESTARTED *****

Tue Sep 20 20:36:55 [initandlisten] MongoDB starting : pid=2315
port=27018 dbpath=/var/lib/mongodb 64-bit host=nos-db-s0-b
...<more seemingly normal startup stuff>

I cleared the logs earlier today, so every entry (other than the
suspicious one above) is from today, Tue Sep 20. What is up with the
partial [replica set sync] line from a week ago?

Thanks,
Dan

Dan Spinosa

unread,

Sep 20, 2011, 10:50:10 PM9/20/11

to mongodb-user

Was finally able to run db.CurrentOp() on the mongod after it
saturated the CPU and took down the cluster:

SECONDARY> db.currentOp()
{
"inprog" : [
{
"opid" : 414406,

"active" : true,
"lockType" : "read",

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://www.digital-photography-school.com/sweet-spots-why-
your-f1-8-isnt-so-great-at-f1-8"
},
"client" : "10.180.164.129:50749",
"desc" : "conn",
"threadId" : "0x7ec649c9c700",
"connectionId" : 735,
"numYields" : 0
},
{
"opid" : 415319,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://www.youtube.com/watch?
v=H_fp3FKOYxY&feature=player_embedded"
},
"client" : "10.180.164.129:50702",
"desc" : "conn",
"threadId" : "0x7ec64bebe700",
"connectionId" : 701,
"numYields" : 0
},
{
"opid" : 414419,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,
"op" : "query",
"ns" : "nos-production.video_processing_link_caches",
"query" : {
"url" : "http://www.youtube.com/watch?
v=H_fp3FKOYxY&feature=player_embedded"
},
"client" : "10.180.164.129:50700",
"desc" : "conn",
"threadId" : "0x7ec64c0c0700",
"connectionId" : 698,
"numYields" : 0
},
{
"opid" : 414389,
"active" : false,
"lockType" : "write",
"waitingForLock" : true,
"op" : "none",
"ns" : "",
"query" : {

},
"client" : "",
"desc" : "rsSync",
"threadId" : "0x7f15be7e3700",
"numYields" : 0
},
{
"opid" : 414465,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,
"op" : "query",
"ns" : "nos-production.link_resolving_caches",
"query" : {
"original_url" : "http://bit.ly/ncGBKA"
},
"client" : "192.168.100.192:45983",
"desc" : "conn",
"threadId" : "0x7ec6ba9e9700",
"connectionId" : 465,
"numYields" : 0
},
{
"opid" : 414477,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://www.facebook.com/common/browser.php"
},
"client" : "192.168.100.192:45985",
"desc" : "conn",
"threadId" : "0x7ec6ba8e8700",
"connectionId" : 467,
"numYields" : 0
},
{
"opid" : 414417,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,
"op" : "query",
"ns" : "nos-production.video_processing_link_caches",
"query" : {
"url" : "http://www.denverpost.com/breakingnews/ci_18935113?
source=rss&utm_medium=twitter&cref=twitter"
},
"client" : "192.168.100.192:38573",
"desc" : "conn",
"threadId" : "0x7ec68d7d7700",
"connectionId" : 617,
"numYields" : 0
},
{
"opid" : 414393,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,

"op" : "query",
"ns" : "nos-production.users",
"query" : {

"_id" : ObjectId("4de64c73f6db243dd7000008")
},
"client" : "192.168.100.192:45972",
"desc" : "conn",
"threadId" : "0x7ec6c97c2700",
"connectionId" : 461,
"numYields" : 0
},
{
"opid" : 414414,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,

"op" : "query",
"ns" : "nos-production.users",
"query" : {

"_id" : ObjectId("4db99d8ff6db240d2f000008")
},
"client" : "192.168.100.192:45953",
"desc" : "conn",
"threadId" : "0x7ec6a9ede700",
"connectionId" : 458,
"numYields" : 0
},
{
"opid" : 414563,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://www.handelsblatt.com/lifestyle/kunstmarkt/messen/
geheimtipp-kunst-der-60er-jahre/4626342.html"
},
"client" : "192.168.100.192:45993",
"desc" : "conn",
"threadId" : "0x7ec6ba5e5700",
"connectionId" : 474,
"numYields" : 0
},
{
"opid" : 414689,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:46001",
"desc" : "conn",
"threadId" : "0x7ec6bb8f8700",
"connectionId" : 482,
"numYields" : 0
},
{
"opid" : 414564,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:45994",
"desc" : "conn",
"threadId" : "0x7ec6bb3f3700",
"connectionId" : 475,
"numYields" : 0
},
{
"opid" : 414566,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:45995",
"desc" : "conn",
"threadId" : "0x7ec6bb2f2700",
"connectionId" : 476,
"numYields" : 0
},
{
"opid" : 414575,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:45996",
"desc" : "conn",
"threadId" : "0x7ec6ba6e6700",
"connectionId" : 477,
"numYields" : 0
},
{
"opid" : 414584,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43259",
"desc" : "conn",
"threadId" : "0x7ec68cdcd700",
"connectionId" : 235,
"numYields" : 0
},
{
"opid" : 414446,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,
"op" : "query",
"ns" : "nos-production.video_processing_link_caches",
"query" : {
"url" : "http://www.denverpost.com/breakingnews/ci_18935113?
source=rss&utm_medium=twitter&cref=twitter"
},
"client" : "192.168.100.192:38579",
"desc" : "conn",
"threadId" : "0x7ec6848c8700",
"connectionId" : 622,
"numYields" : 0
},
{
"opid" : 414399,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,

"op" : "query",
"ns" : "nos-production.users",
"query" : {

"_id" : ObjectId("4e4e754bf6db2434440000db")
},
"client" : "192.168.100.192:45937",
"desc" : "conn",
"threadId" : "0x7ec6c91bc700",
"connectionId" : 457,
"numYields" : 0
},
{
"opid" : 414398,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,
"op" : "query",
"ns" : "nos-production.link_resolving_caches",
"query" : {
"original_url" : "http://us-cars-oldtimer-news.blogspot.com/
2011/09/clio-renault-sport-online-race.html"
},
"client" : "192.168.100.192:45980",
"desc" : "conn",
"threadId" : "0x7ec6baaea700",
"connectionId" : 463,
"numYields" : 0
},
{
"opid" : 414717,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:38618",
"desc" : "conn",
"threadId" : "0x7ec64eaea700",
"connectionId" : 651,
"numYields" : 0
},
{
"opid" : 414390,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,

"op" : "query",
"ns" : "nos-production.users",
"query" : {

"_id" : ObjectId("4e5287aaf6db242da2000003")
},
"client" : "192.168.100.192:45962",
"desc" : "conn",
"threadId" : "0x7ec6bb0f0700",
"connectionId" : 459,
"numYields" : 0
},
{
"opid" : 414532,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"user_id" : ObjectId("4db9e128f6db246002000001"),
"special" : 1
},
"client" : "10.180.164.129:50688",
"desc" : "conn",
"threadId" : "0x7ec64cccc700",
"connectionId" : 687,
"numYields" : 0
},
{
"opid" : 414892,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"_id" : ObjectId("4dac7011f6db24112600002d")
},
"client" : "10.180.179.163:36912",
"desc" : "conn",
"threadId" : "0x7ec6c9cc7700",
"connectionId" : 454,
"numYields" : 0
},
{
"opid" : 414574,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://www.startupnation.com/business-blogs/index.php/
2011/09/16/5-ways-customer-stories-build-brands/"
},
"client" : "192.168.100.192:45997",
"desc" : "conn",
"threadId" : "0x7ec6bb4f4700",
"connectionId" : 478,
"numYields" : 0
},
{
"opid" : 414572,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:45998",
"desc" : "conn",
"threadId" : "0x7ec6bb5f5700",
"connectionId" : 479,
"numYields" : 0
},
{
"opid" : 414673,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:45999",
"desc" : "conn",
"threadId" : "0x7ec6bb6f6700",
"connectionId" : 480,
"numYields" : 0
},
{
"opid" : 414391,

"active" : true,
"lockType" : "read",

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"original_url" : "http://bit.ly/ncGBKA"
},
"client" : "192.168.100.192:42474",
"desc" : "conn",
"threadId" : "0x7ec6b98d8700",
"connectionId" : 98,
"numYields" : 0
},
{
"opid" : 414547,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:42498",
"desc" : "conn",
"threadId" : "0x7ec6ab1f1700",
"connectionId" : 113,
"numYields" : 0
},
{
"opid" : 414470,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"original_url" : "http://bit.ly/ncGBKA"
},
"client" : "192.168.100.192:42484",
"desc" : "conn",
"threadId" : "0x7ec6ab8f8700",
"connectionId" : 106,
"numYields" : 0
},
{
"opid" : 414410,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,

"op" : "query",
"ns" : "nos-production.users",
"query" : {

"_id" : ObjectId("4e1e5da8f6db243adb000033")
},
"client" : "10.180.164.129:53010",
"desc" : "conn",
"threadId" : "0x7ec6a82c2700",
"connectionId" : 531,
"numYields" : 0
},
{
"opid" : 414462,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,
"op" : "query",
"ns" : "nos-production.link_resolving_caches",
"query" : {
"original_url" : "http://bit.ly/ncGBKA"
},
"client" : "192.168.100.192:42482",
"desc" : "conn",
"threadId" : "0x7ec6ab9f9700",
"connectionId" : 105,
"numYields" : 0
},
{
"opid" : 414460,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,
"op" : "query",
"ns" : "nos-production.video_processing_link_caches",
"query" : {
"url" : "http://staffordfm.com/stafford-fm-news/mbs/"
},
"client" : "192.168.100.192:42481",
"desc" : "conn",
"threadId" : "0x7ec6abafa700",
"connectionId" : 104,
"numYields" : 0
},
{
"opid" : 414890,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://blog.us.playstation.com/2011/09/20/ico-shadow-of-
the-colossus-collection-next-week-bonus-content-preview/?
utm_source=twitter&utm_medium=social&utm_campaign=ICOPreview_091911"
},
"client" : "192.168.100.192:42516",
"desc" : "conn",
"threadId" : "0x7ec6b92d2700",
"connectionId" : 131,
"numYields" : 0
},
{
"opid" : 414500,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"original_url" : "http://bit.ly/ncGBKA"
},
"client" : "192.168.100.192:42492",
"desc" : "conn",
"threadId" : "0x7ec6ab7f7700",
"connectionId" : 107,
"numYields" : 0
},
{
"opid" : 414421,

"active" : true,
"lockType" : "read",

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://abduzeedo.com/tuesday-total-textures-89?
utm_source=twitterfeed&utm_medium=twitter&utm_campaign=Feed%3A
+abduzeedo+%28Abduzeedo+Feed%29"
},
"client" : "192.168.100.192:42521",
"desc" : "conn",
"threadId" : "0x7ec6b8dcd700",
"connectionId" : 136,
"numYields" : 0
},
{
"opid" : 414452,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,
"op" : "query",
"ns" : "nos-production.link_resolving_caches",
"query" : {
"original_url" : "http://bit.ly/ncGBKA"
},
"client" : "192.168.100.192:42479",
"desc" : "conn",
"threadId" : "0x7ec6abcfc700",
"connectionId" : 102,
"numYields" : 0
},
{
"opid" : 414867,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://blog.us.playstation.com/2011/09/20/ico-shadow-of-
the-colossus-collection-next-week-bonus-content-preview/?
utm_source=twitter&utm_medium=social&utm_campaign=ICOPreview_091911"
},
"client" : "192.168.100.192:46022",
"desc" : "conn",
"threadId" : "0x7ec6c86b1700",
"connectionId" : 503,
"numYields" : 0
},
{
"opid" : 414872,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://blog.us.playstation.com/2011/09/20/ico-shadow-of-
the-colossus-collection-next-week-bonus-content-preview/?
utm_source=twitter&utm_medium=social&utm_campaign=ICOPreview_091911"
},
"client" : "192.168.100.192:46023",
"desc" : "conn",
"threadId" : "0x7ec6c85b0700",
"connectionId" : 504,
"numYields" : 0
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"url" : "http://www.ajemadrid.es/¡¡arranca-la-iv-edicion-del-club-
de-tu-negocio/"
},
"client" : "10.180.164.129:50715",
"desc" : "conn",
"threadId" : "0x7ec64b1b1700",
"connectionId" : 714,
"numYields" : 0
},
{
"opid" : 414483,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"user_id" : ObjectId("4dfc0f05f6db24572800001f"),
"special" : 1
},
"client" : "10.180.164.129:50699",
"desc" : "conn",
"threadId" : "0x7ec64c1c1700",
"connectionId" : 697,
"numYields" : 0
},
{
"opid" : 414688,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:38615",
"desc" : "conn",
"threadId" : "0x7ec64eded700",
"connectionId" : 648,
"numYields" : 0
},
{
"opid" : 414685,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:38614",
"desc" : "conn",
"threadId" : "0x7ec64eeee700",
"connectionId" : 647,
"numYields" : 0
},
{
"opid" : 414677,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:38613",
"desc" : "conn",
"threadId" : "0x7ec64efef700",
"connectionId" : 646,
"numYields" : 0
},
{
"opid" : 414555,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:38600",
"desc" : "conn",
"threadId" : "0x7ec64fafa700",
"connectionId" : 635,
"numYields" : 0
},
{
"opid" : 414516,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://www.digital-photography-school.com/sweet-spots-why-
your-f1-8-isnt-so-great-at-f1-8"
},
"client" : "10.180.164.129:50748",
"desc" : "conn",
"threadId" : "0x7ec649d9d700",
"connectionId" : 734,
"numYields" : 0
},
{
"opid" : 414467,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"authentications.provider" : "twitter",
"authentications.uid" : "3334111"
},
"client" : "10.180.164.129:50695",
"desc" : "conn",
"threadId" : "0x7ec64c5c5700",
"connectionId" : 694,
"numYields" : 0
},
{
"opid" : 414672,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:38611",
"desc" : "conn",
"threadId" : "0x7ec64f1f1700",
"connectionId" : 644,
"numYields" : 0
},
{
"opid" : 414895,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"original_url" : "http://bit.ly/nfp6ly"
},
"client" : "10.180.164.129:53050",
"desc" : "conn",
"threadId" : "0x7ec6a95d5700",
"connectionId" : 571,
"numYields" : 0
},
{
"opid" : 414605,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://www.sfgirlbybay.com/2011/09/20/tuesdays-girl-
mighty-summit/"
},
"client" : "192.168.100.192:38606",
"desc" : "conn",
"threadId" : "0x7ec64f5f5700",
"connectionId" : 641,
"numYields" : 0
},
{
"opid" : 414701,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:46009",
"desc" : "conn",
"threadId" : "0x7ec6c99c4700",
"connectionId" : 490,
"numYields" : 0
},
{
"opid" : 414708,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:46014",
"desc" : "conn",
"threadId" : "0x7ec6c8fba700",
"connectionId" : 495,
"numYields" : 0
},
{
"opid" : 414498,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"authentications.provider" : "twitter",
"authentications.uid" : "14178417"
},
"client" : "10.180.164.129:50728",
"desc" : "conn",
"threadId" : "0x7ec64a5a5700",
"connectionId" : 727,
"numYields" : 0
},
{
"opid" : 414454,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,
"op" : "query",
"ns" : "nos-production.link_resolving_caches",
"query" : {
"original_url" : "http://moi.st/277c8c"
},
"client" : "10.180.164.129:50689",
"desc" : "conn",
"threadId" : "0x7ec64cbcb700",
"connectionId" : 688,
"numYields" : 0
},
{
"opid" : 414485,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"user_id" : ObjectId("4d90d73af6db246bda000027"),
"special" : 1
},
"client" : "10.180.164.129:50726",
"desc" : "conn",
"threadId" : "0x7ec64a6a6700",
"connectionId" : 725,
"numYields" : 0
},
{
"opid" : 414501,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://ferrari-f50-in-london-news.blogspot.com/2011/09/
first-is-standard-gauge.html"
},
"client" : "10.180.164.129:50716",
"desc" : "conn",
"threadId" : "0x7ec64b0b0700",
"connectionId" : 715,
"numYields" : 0
},
{
"opid" : 414514,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"original_url" : "http://bit.ly/ncGBKA"
},
"client" : "10.180.164.129:50732",
"desc" : "conn",
"threadId" : "0x7ec64a1a1700",
"connectionId" : 730,
"numYields" : 0
},
{
"opid" : 414481,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://www.cirugiaesteticayspa.cl/blog/?
p=1209&utm_medium=twitter&utm_source=twitterfeed"
},
"client" : "10.180.164.129:50717",
"desc" : "conn",
"threadId" : "0x7ec64afaf700",
"connectionId" : 716,
"numYields" : 0
},
{
"opid" : 414482,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"user_id" : ObjectId("4d9deeb8f6db245ba9000001"),
"special" : 1
},
"client" : "10.180.164.129:50718",
"desc" : "conn",
"threadId" : "0x7ec64aeae700",
"connectionId" : 717,
"numYields" : 0
},
{
"opid" : 414437,

"active" : true,
"lockType" : "read",

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:38616",
"desc" : "conn",
"threadId" : "0x7ec64ecec700",
"connectionId" : 649,
"numYields" : 0
},
{
"opid" : 414450,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,
"op" : "query",
"ns" : "nos-production.link_resolving_caches",
"query" : {
"original_url" : "http://bit.ly/ncGBKA"
},
"client" : "192.168.100.192:38592",
"desc" : "conn",
"threadId" : "0x7ec6843c3700",
"connectionId" : 629,
"numYields" : 0
},
{
"opid" : 414597,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43267",
"desc" : "conn",
"threadId" : "0x7ec68c5c5700",
"connectionId" : 243,
"numYields" : 0
},
{
"opid" : 414589,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43256",
"desc" : "conn",
"threadId" : "0x7ec68cece700",
"connectionId" : 234,
"numYields" : 0
},
{
"opid" : 414596,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43268",
"desc" : "conn",
"threadId" : "0x7ec68c4c4700",
"connectionId" : 247,
"numYields" : 0
},
{
"opid" : 414578,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43234",
"desc" : "conn",
"threadId" : "0x7ec68cfcf700",
"connectionId" : 233,
"numYields" : 0
},
{
"opid" : 414606,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43272",
"desc" : "conn",
"threadId" : "0x7ec687fff700",
"connectionId" : 248,
"numYields" : 0
},
{
"opid" : 414622,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43284",
"desc" : "conn",
"threadId" : "0x7ec6874f4700",
"connectionId" : 259,
"numYields" : 0
},
{
"opid" : 414627,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43286",
"desc" : "conn",
"threadId" : "0x7ec6872f2700",
"connectionId" : 261,
"numYields" : 0
},
{
"opid" : 414647,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43306",
"desc" : "conn",
"threadId" : "0x7ec6860e0700",
"connectionId" : 280,
"numYields" : 0
},
{
"opid" : 414678,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43316",
"desc" : "conn",
"threadId" : "0x7ec6856d6700",
"connectionId" : 289,
"numYields" : 0
},
{
"opid" : 414676,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43317",
"desc" : "conn",
"threadId" : "0x7ec6855d5700",
"connectionId" : 290,
"numYields" : 0
},
{
"opid" : 414632,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43293",
"desc" : "conn",
"threadId" : "0x7ec686ded700",
"connectionId" : 266,
"numYields" : 0
},
{
"opid" : 414648,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43307",
"desc" : "conn",
"threadId" : "0x7ec685fdf700",
"connectionId" : 279,
"numYields" : 0
},
{
"opid" : 414633,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43290",
"desc" : "conn",
"threadId" : "0x7ec686eee700",
"connectionId" : 265,
"numYields" : 0
},
{
"opid" : 414654,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43311",
"desc" : "conn",
"threadId" : "0x7ec685bdb700",
"connectionId" : 284,
"numYields" : 0
},
{
"opid" : 414651,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:43308",
"desc" : "conn",
"threadId" : "0x7ec685ede700",
"connectionId" : 281,
"numYields" : 0
},
{
"opid" : 415310,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://blog.us.playstation.com/2011/09/20/ico-shadow-of-
the-colossus-collection-next-week-bonus-content-preview/?
utm_source=twitter&utm_medium=social&utm_campaign=ICOPreview_091911"
},
"client" : "192.168.100.192:42523",
"desc" : "conn",
"threadId" : "0x7ec6b8bcb700",
"connectionId" : 138,
"numYields" : 0
},
{
"opid" : 414876,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://blog.us.playstation.com/2011/09/20/ico-shadow-of-
the-colossus-collection-next-week-bonus-content-preview/?
utm_source=twitter&utm_medium=social&utm_campaign=ICOPreview_091911"
},
"client" : "192.168.100.192:42512",
"desc" : "conn",
"threadId" : "0x7ec6b96d6700",
"connectionId" : 127,
"numYields" : 0
},
{
"opid" : 414512,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:42494",
"desc" : "conn",
"threadId" : "0x7ec6ab5f5700",
"connectionId" : 109,
"numYields" : 0
},
{
"opid" : 414559,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:42500",
"desc" : "conn",
"threadId" : "0x7ec6aafef700",
"connectionId" : 115,
"numYields" : 0
},
{
"opid" : 414562,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:42501",
"desc" : "conn",
"threadId" : "0x7ec6aaeee700",
"connectionId" : 116,
"numYields" : 0
},
{
"opid" : 414665,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:42504",
"desc" : "conn",
"threadId" : "0x7ec6aabeb700",
"connectionId" : 119,
"numYields" : 0
},
{
"opid" : 414852,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://www.ustream.tv/recorded/
15417696#utm_campaign=synclickback&source=http://smalltown.140conf.com/
&medium=15417696"
},
"client" : "192.168.100.192:42510",
"desc" : "conn",
"threadId" : "0x7ec6aa5e5700",
"connectionId" : 125,
"numYields" : 0
},
{
"opid" : 414523,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:42471",
"desc" : "conn",
"threadId" : "0x7ec6b9ada700",
"connectionId" : 96,
"numYields" : 0
},
{
"opid" : 414430,

"active" : true,
"lockType" : "read",

"waitingForLock" : false,
"secs_running" : 338,
"op" : "query",
"ns" : "nos-production.link_resolving_caches",
"query" : {
"original_url" : "http://bit.ly/ncGBKA"
},
"client" : "192.168.100.192:42473",
"desc" : "conn",
"threadId" : "0x7ec6b99d9700",
"connectionId" : 97,
"numYields" : 0
},
{
"opid" : 414663,
"active" : false,

"lockType" : "read",
"waitingForLock" : true,

"op" : "query",
"ns" : "",
"query" : {
"url" : "http://papers.ssrn.com/sol3/papers.cfm?
abstract_id=1930272"
},
"client" : "192.168.100.192:42505",
"desc" : "conn",
"threadId" : "0x7ec6aaaea700",
"connectionId" : 120,
"numYields" : 0
}
]
}

And here is the db.currentOp() on the primary which remained healthy
(didn't have to be rebooted):

PRIMARY> db.currentOp()
{
"inprog" : [
{
"opid" : 3472321,
"active" : false,
"lockType" : "write",
"waitingForLock" : false,
"op" : "none",
"ns" : "",
"query" : {

},
"client" : "",
"desc" : "rsSync",
"threadId" : "0x7f1c9b2e3700",
"numYields" : 0
}
]
}

Thanks,
Dan

On Sep 15, 12:46 am, Eliot Horowitz <el...@10gen.com> wrote:

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axlfu

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Sep 21, 2011, 8:10:42 AM9/21/11

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You should create indexes on url and origin_url

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axlfu

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Sep 21, 2011, 8:15:35 AM9/21/11

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You should create indexes on url and origin_url

On Sep 21, 10:50 am, Dan Spinosa <spin...@gmail.com> wrote:

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Dan Spinosa

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Sep 21, 2011, 10:11:00 AM9/21/11

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We are indexed on url.

Why do you mention origin_url? I don't believe I posted anything that
included it...

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Dan Spinosa

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Sep 21, 2011, 10:13:01 AM9/21/11

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To keep this thread up to date, a couple of notes on the current
status:

- The main issue is CPU hitting 100% * num_cores. The other issues in
the thread are not taking down the entire replica set; probably just
distractions.

- The CPU issues are not strictly showing up on the primary.
Initially this seemed like the case, but now they're only happening on
a secondary. They do seem to have one thing in common though: always
seem to happen to the same machine, repeatedly.

I've also setup MMS to help 10gen engineers dig deeper into this.

Thanks all.
-Dan

On Sep 21, 8:15 am, axlfu <freesearc...@gmail.com> wrote:

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付玉

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Sep 22, 2011, 5:54:25 AM9/22/11

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{
"opid" : 414465,
"active" : true,
"lockType" : "read",
"waitingForLock" : false,
"secs_running" : 338,
"op" : "query",
"ns" : "nos-production.link_resolving_caches",
"query" : {
"original_url" : "http://bit.ly/ncGBKA"
},
"client" : "192.168.100.192:45983",
"desc" : "conn",
"threadId" : "0x7ec6ba9e9700",
"connectionId" : 465,
"numYields" : 0
}

what about db.stats(),db.serverStatus(), and iostat?

2011/9/21 Dan Spinosa <spi...@gmail.com>

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