items not sticking around

Sunny Side Up

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Dec 5, 2016, 6:02:05 PM12/5/16

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Hi,

Can anyone help me with this question:

http://stackoverflow.com/questions/40964315/stop-memcache-from-removing-data-in-php-silverstripe-zend-cache

I have recently installed memcache(d), but the data only seems to stay in the cache for a minute or so, even though I have set the expiration to three days. I am trying to cache 1000s of items, but only a few seem to stick! Here are the stats:

STAT pid 31586
STAT uptime 253023
STAT time 1480889337
STAT version 1.4.14 (Ubuntu)
STAT libevent 2.0.21-stable
STAT pointer_size 64
STAT rusage_user 17.270251
STAT rusage_system 72.982928
STAT curr_connections 5
STAT total_connections 9083
STAT connection_structures 15
STAT reserved_fds 20
STAT cmd_get 577101
STAT cmd_set 217153
STAT cmd_flush 19612
STAT cmd_touch 0
STAT get_hits 382249
STAT get_misses 194852
STAT delete_misses 10
STAT delete_hits 0
STAT incr_misses 0
STAT incr_hits 0
STAT decr_misses 0
STAT decr_hits 0
STAT cas_misses 0
STAT cas_hits 0
STAT cas_badval 0
STAT touch_hits 0
STAT touch_misses 0
STAT auth_cmds 0
STAT auth_errors 0
STAT bytes_read 544127879
STAT bytes_written 1028900006
STAT limit_maxbytes 536870912
STAT accepting_conns 1
STAT listen_disabled_num 0
STAT threads 4
STAT conn_yields 0
STAT hash_power_level 16
STAT hash_bytes 524288
STAT hash_is_expanding 0
STAT expired_unfetched 0
STAT evicted_unfetched 0
STAT bytes 434350
STAT curr_items 163
STAT total_items 217153
STAT evictions 0
STAT reclaimed 111319

and here are the stats for the items:

stats items
STAT items:3:number 1
STAT items:3:age 133084
STAT items:3:evicted 0
STAT items:3:evicted_nonzero 0
STAT items:3:evicted_time 0
STAT items:3:outofmemory 0
STAT items:3:tailrepairs 0
STAT items:3:reclaimed 0
STAT items:3:expired_unfetched 0
STAT items:3:evicted_unfetched 0
STAT items:4:number 4
STAT items:4:age 857
STAT items:4:evicted 0
STAT items:4:evicted_nonzero 0
STAT items:4:evicted_time 0
STAT items:4:outofmemory 0
STAT items:4:tailrepairs 0
STAT items:4:reclaimed 616
STAT items:4:expired_unfetched 0
STAT items:4:evicted_unfetched 0
STAT items:5:number 2
STAT items:5:age 52
STAT items:5:evicted 0
STAT items:5:evicted_nonzero 0
STAT items:5:evicted_time 0
STAT items:5:outofmemory 0
STAT items:5:tailrepairs 0
STAT items:5:reclaimed 1364
STAT items:5:expired_unfetched 0
STAT items:5:evicted_unfetched 0
STAT items:6:number 39
STAT items:6:age 46
STAT items:6:evicted 0
STAT items:6:evicted_nonzero 0
STAT items:6:evicted_time 0
STAT items:6:outofmemory 0
STAT items:6:tailrepairs 0
STAT items:6:reclaimed 17782
STAT items:6:expired_unfetched 0
STAT items:6:evicted_unfetched 0
STAT items:7:number 55
STAT items:7:age 51
STAT items:7:evicted 0
STAT items:7:evicted_nonzero 0
STAT items:7:evicted_time 0
STAT items:7:outofmemory 0
STAT items:7:tailrepairs 0
STAT items:7:reclaimed 15681
STAT items:7:expired_unfetched 0
STAT items:7:evicted_unfetched 0
STAT items:8:number 24
STAT items:8:age 51
STAT items:8:evicted 0
STAT items:8:evicted_nonzero 0
STAT items:8:evicted_time 0
STAT items:8:outofmemory 0
STAT items:8:tailrepairs 0
STAT items:8:reclaimed 4980
STAT items:8:expired_unfetched 0
STAT items:8:evicted_unfetched 0
STAT items:9:number 22
STAT items:9:age 50
STAT items:9:evicted 0
STAT items:9:evicted_nonzero 0
STAT items:9:evicted_time 0
STAT items:9:outofmemory 0
STAT items:9:tailrepairs 0
STAT items:9:reclaimed 6601
STAT items:9:expired_unfetched 0
STAT items:9:evicted_unfetched 0
STAT items:10:number 20
STAT items:10:age 52
STAT items:10:evicted 0
STAT items:10:evicted_nonzero 0
STAT items:10:evicted_time 0
STAT items:10:outofmemory 0
STAT items:10:tailrepairs 0
STAT items:10:reclaimed 20550
STAT items:10:expired_unfetched 0
STAT items:10:evicted_unfetched 0
STAT items:11:number 26
STAT items:11:age 50
STAT items:11:evicted 0
STAT items:11:evicted_nonzero 0
STAT items:11:evicted_time 0
STAT items:11:outofmemory 0
STAT items:11:tailrepairs 0
STAT items:11:reclaimed 7857
STAT items:11:expired_unfetched 0
STAT items:11:evicted_unfetched 0
STAT items:12:number 13
STAT items:12:age 50
STAT items:12:evicted 0
STAT items:12:evicted_nonzero 0
STAT items:12:evicted_time 0
STAT items:12:outofmemory 0
STAT items:12:tailrepairs 0
STAT items:12:reclaimed 2656
STAT items:12:expired_unfetched 0
STAT items:12:evicted_unfetched 0
STAT items:13:number 9
STAT items:13:age 50
STAT items:13:evicted 0
STAT items:13:evicted_nonzero 0
STAT items:13:evicted_time 0
STAT items:13:outofmemory 0
STAT items:13:tailrepairs 0
STAT items:13:reclaimed 2737
STAT items:13:expired_unfetched 0
STAT items:13:evicted_unfetched 0
STAT items:14:number 17
STAT items:14:age 52
STAT items:14:evicted 0
STAT items:14:evicted_nonzero 0
STAT items:14:evicted_time 0
STAT items:14:outofmemory 0
STAT items:14:tailrepairs 0
STAT items:14:reclaimed 8091
STAT items:14:expired_unfetched 0
STAT items:14:evicted_unfetched 0
STAT items:15:number 10
STAT items:15:age 49
STAT items:15:evicted 0
STAT items:15:evicted_nonzero 0
STAT items:15:evicted_time 0
STAT items:15:outofmemory 0
STAT items:15:tailrepairs 0
STAT items:15:reclaimed 2836
STAT items:15:expired_unfetched 0
STAT items:15:evicted_unfetched 0
STAT items:16:number 8
STAT items:16:age 50
STAT items:16:evicted 0
STAT items:16:evicted_nonzero 0
STAT items:16:evicted_time 0
STAT items:16:outofmemory 0
STAT items:16:tailrepairs 0
STAT items:16:reclaimed 5097
STAT items:16:expired_unfetched 0
STAT items:16:evicted_unfetched 0
STAT items:17:number 5
STAT items:17:age 50
STAT items:17:evicted 0
STAT items:17:evicted_nonzero 0
STAT items:17:evicted_time 0
STAT items:17:outofmemory 0
STAT items:17:tailrepairs 0
STAT items:17:reclaimed 3297
STAT items:17:expired_unfetched 0
STAT items:17:evicted_unfetched 0
STAT items:18:number 1
STAT items:18:age 45
STAT items:18:evicted 0
STAT items:18:evicted_nonzero 0
STAT items:18:evicted_time 0
STAT items:18:outofmemory 0
STAT items:18:tailrepairs 0
STAT items:18:reclaimed 763
STAT items:18:expired_unfetched 0
STAT items:18:evicted_unfetched 0
STAT items:19:number 2
STAT items:19:age 119
STAT items:19:evicted 0
STAT items:19:evicted_nonzero 0
STAT items:19:evicted_time 0
STAT items:19:outofmemory 0
STAT items:19:tailrepairs 0
STAT items:19:reclaimed 786
STAT items:19:expired_unfetched 0
STAT items:19:evicted_unfetched 0
STAT items:20:number 2
STAT items:20:age 52
STAT items:20:evicted 0
STAT items:20:evicted_nonzero 0
STAT items:20:evicted_time 0
STAT items:20:outofmemory 0
STAT items:20:tailrepairs 0
STAT items:20:reclaimed 820
STAT items:20:expired_unfetched 0
STAT items:20:evicted_unfetched 0
STAT items:21:number 2
STAT items:21:age 592
STAT items:21:evicted 0
STAT items:21:evicted_nonzero 0
STAT items:21:evicted_time 0
STAT items:21:outofmemory 0
STAT items:21:tailrepairs 0
STAT items:21:reclaimed 420
STAT items:21:expired_unfetched 0
STAT items:21:evicted_unfetched 0
STAT items:22:number 2
STAT items:22:age 41
STAT items:22:evicted 0
STAT items:22:evicted_nonzero 0
STAT items:22:evicted_time 0
STAT items:22:outofmemory 0
STAT items:22:tailrepairs 0
STAT items:22:reclaimed 3975
STAT items:22:expired_unfetched 0
STAT items:22:evicted_unfetched 0
STAT items:23:number 2
STAT items:23:age 52
STAT items:23:evicted 0
STAT items:23:evicted_nonzero 0
STAT items:23:evicted_time 0
STAT items:23:outofmemory 0
STAT items:23:tailrepairs 0
STAT items:23:reclaimed 2398
STAT items:23:expired_unfetched 0
STAT items:23:evicted_unfetched 0
STAT items:24:number 1
STAT items:24:age 5
STAT items:24:evicted 0
STAT items:24:evicted_nonzero 0
STAT items:24:evicted_time 0
STAT items:24:outofmemory 0
STAT items:24:tailrepairs 0
STAT items:24:reclaimed 892
STAT items:24:expired_unfetched 0
STAT items:24:evicted_unfetched 0
STAT items:25:number 1
STAT items:25:age 5
STAT items:25:evicted 0
STAT items:25:evicted_nonzero 0
STAT items:25:evicted_time 0
STAT items:25:outofmemory 0
STAT items:25:tailrepairs 0
STAT items:25:reclaimed 158
STAT items:25:expired_unfetched 0
STAT items:25:evicted_unfetched 0
STAT items:26:number 1
STAT items:26:age 546
STAT items:26:evicted 0
STAT items:26:evicted_nonzero 0
STAT items:26:evicted_time 0
STAT items:26:outofmemory 0
STAT items:26:tailrepairs 0
STAT items:26:reclaimed 19
STAT items:26:expired_unfetched 0
STAT items:26:evicted_unfetched 0
STAT items:29:number 1
STAT items:29:age 688
STAT items:29:evicted 0
STAT items:29:evicted_nonzero 0
STAT items:29:evicted_time 0
STAT items:29:outofmemory 0
STAT items:29:tailrepairs 0
STAT items:29:reclaimed 3
STAT items:29:expired_unfetched 0
STAT items:29:evicted_unfetched 0
STAT items:32:number 1
STAT items:32:age 70054
STAT items:32:evicted 0
STAT items:32:evicted_nonzero 0
STAT items:32:evicted_time 0
STAT items:32:outofmemory 0
STAT items:32:tailrepairs 0
STAT items:32:reclaimed 0
STAT items:32:expired_unfetched 0
STAT items:32:evicted_unfetched 0

There seems to be something wrong with every single item. Why is that?

I am using

Ubuntu 14.04
PHP
Silverstripe 3.5.0
Zend_Cache (part of Silvertripe)
Memcache version: 1.4.14

Below you can see some more stats.

server stats

slab stats

I would really appreciate some pointers as memcache is new to me.

Dormando

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Dec 5, 2016, 6:49:39 PM12/5/16

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90% of the time this is due to users getting the flags and ttl arguments backwards in PHP.

so they ttl after a minute instead of the intended time

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Sunny Side Up

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Dec 5, 2016, 6:54:31 PM12/5/16

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Hi Dormando,

Thank you for your reply. Can you expand on this?

Cheers

Nicolaas

Sunny Side Up

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Dec 6, 2016, 4:39:33 PM12/6/16

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This is how my key is stored:

and it disappears after just 30 seconds or so, even though the expiry is set to 6000.

Can anyone help????????

(also see: http://stackoverflow.com/questions/40964315/stop-memcache-from-removing-data-in-php-silverstripe-zend-cache)

Thank you

Nicolaas

dormando

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Dec 7, 2016, 3:16:41 AM12/7/16

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You're setting the TTL to 30, not 6000. Exactly as I responded before.

In the stats you posted, you see that *evictions* are zero, but *reclaims*
are nonzero. reclaims happen when expires items are reclaimed into the
free pool.

I don't know how you're setting the TTL wrong. PHP people can probably
help better with that.

On Tue, 6 Dec 2016, 'Sunny Side Up' via memcached wrote:

> This is how my key is stored:

> [85d4309c-bc66-11e6-8407-398d84aba6e7.png]

>
> and it disappears after just 30 seconds or so, even though the expiry is set to 6000.
>
> Can anyone help????????
>
> (also see: http://stackoverflow.com/questions/40964315/stop-memcache-from-removing-data-in-php-silverstripe-zend-cache)
>
> Thank you
>
> Nicolaas
>

Nicolaas Thiemen Francken

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Dec 7, 2016, 3:24:44 AM12/7/16

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Hi,

Thank you again for your reply.

Sorry but where or how do you know the TTL is 30? I agree that items disappear after about 30 seconds, but where or how do I set the TTL for memcache?

i have had a look in the memcached.conf file. There is no setting in there that relates to expiry or TTL or similar.

In the item, you can also see that it is set to expire in 6000 seconds.

The item basically has three pieces of info (serialised):

1. value

2. timestamp

3. seconds until expiry

dormando

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Dec 7, 2016, 3:31:17 AM12/7/16

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The expirey isn't inside the item value. It's part of the protocol when
storing the item. It's not in the server configuration, it's in the
*client* making the actual store.

ie: You have your serialized blob ($data), and then you want to store it
into memcached, you make a call that looks like:

$client = PHPGarbage->new("127.0.0.1:11211")
$client->set($data, 6000, etc);
the TTL is not in the data, but in the argument to the set command. Some
PHP clients have confusing syntax and people put the TTL into the wrong
field.

Since you've listed a stack of software abstractions, you need to go find
out exactly what thing is actually running the set() command to memcached
and what it's using as a TTL argument. My wild guess is that you're not
specifying a value to the abstraction and it's using 30 as a default.

I know the TTL is 30 because I wrote this software and that's how it
behaves.

Nicolaas Thiemen Francken

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Dec 7, 2016, 1:42:35 PM12/7/16

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Hi Dormando,

I am running the same code locally and it does not expire. I have to check a few more differences, but I am running an almost identical setup on my laptop and it appears to work fine.

What I am going to do is to compare all the settings between the server and local dev server to see if there is anything different.

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Nicolaas Thiemen Francken

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Dec 8, 2016, 3:22:04 AM12/8/16

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Hi Dormando et al.

I did a lot of testing and it definitely has nothing to do with the TTL as far as I can see:

See http://stackoverflow.com/questions/40964315/stop-memcache-from-removing-data-in-php-silverstripe-zend-cache for more details.

Basically I have two test sites and two lives sites and I found that the busier the site the more likely it is that the cache key disappears. Is there anyway I can ping / find out how / if a cache gets flushed / cleared?

dormando

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Dec 8, 2016, 3:26:19 AM12/8/16

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STAT cmd_flush 19612

you're flushing the cache constantly.

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Dec 8, 2016, 3:27:52 AM12/8/16

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ok, but how am I doing this? how can I change this?

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dormando

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Dec 8, 2016, 3:31:20 AM12/8/16

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One of the libraries is calling a flush command somewhere for some reason.
I've no idea why it would do that offhand.

You can flatly disable cmd_flush via a startup option (find it in the
manpage; I can't recall it offhand), but it's probably worth finding out
what's doing that.

The command is called "flush_all" if that helps.

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Dec 8, 2016, 3:37:00 AM12/8/16

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I had a search throughout the project and there is no mention at all of flush_all. I think it has something to do with memory management or some way we are crashing the server so it flushes itself.

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dormando

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Dec 8, 2016, 3:41:21 AM12/8/16

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What?

crashing what server? what memory management?

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dormando

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Dec 8, 2016, 3:56:14 AM12/8/16

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I just downloaded silverstripe:

framework/thirdparty/Zend/Cache/Backend/Libmemcached.php:245 ->
public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags =
array())
{
switch ($mode) {
case Zend_Cache::CLEANING_MODE_ALL:
return $this->_memcache->flush();
break;
^ calls flush(), which is probably flush_all, if you call clean() with no
args. It doesn't seem to support any other arguments.

$ grep -rn "\->clean(" * | wc -l
25

clean is called a bunch of times for a bunch of reasons. You're probably
hitting one of them every so often.

Maybe you should start harassing the SilverStripe people for using
memcached like it's 2005? While you're there; explain to them how tarballs
work and to put their shit under a subdirectory.

You'll get much better support from them than blaming the server over and
over anyway. They're obviously doing completely lazy cache invalidation by
flushing the entire server constantly. That's not how it was designed to
be used at all.

Nicolaas Thiemen Francken

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Dec 8, 2016, 7:08:28 PM12/8/16

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Hi Dormando,

I found the error! I just wanted to thank you wholeheartedly for all your input. Awesome. Much appreciated. You were 100% right i the end. Silverstripe's caching mechanisms are a bit of a mess. I have raised a ticket with them and my applications are working now.

YES!!!

Thank you for all your patience and help. I really appreciated your help and it helped me get through this dark period in my coding history ;-)))

THANK YOU - THANK YOU - THANK YOU

Nicolaas

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dormando

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Dec 10, 2016, 12:12:54 AM12/10/16

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Apologies for being a bit of a prick and missing the cmd_flush bit the
first time around.

Good luck.

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