Can't rebalance
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Lasse Schou
Mar 23, 2014, 5:07:39 PM3/23/14
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Hi,
I have two Couchbase clusters that run pretty smoothly, however whenever I try to rebalance one of the cluster if always fails with a "wait_backfill_complete, infinity" message. I know that I have had issues with memory fragmentation due to the fact that I write small documents that are later changed to bigger ones, so I've tried installing the latest tcmalloc as suggested by Aliaksey. I've tried restarting all the nodes, while stopping all incoming data, but the result is always the same. When reaching the bucket "html" it constantly fails after a while.
I hope someone can help shed some light on the cause of these issues and let me know how to complete the rebalance. You can find the cbcollect_info zip file links below.
Thanks,
Lasse Schou
Aliaksey Kandratsenka
Mar 24, 2014, 6:13:02 PM3/24/14
to couc...@googlegroups.com
On Sun, Mar 23, 2014 at 2:07 PM, Lasse Schou <lasse...@gmail.com> wrote:
Hi,I have two Couchbase clusters that run pretty smoothly, however whenever I try to rebalance one of the cluster if always fails with a "wait_backfill_complete, infinity" message. I know that I have had issues with memory fragmentation due to the fact that I write small documents that are later changed to bigger ones, so I've tried installing the latest tcmalloc as suggested by Aliaksey. I've tried restarting all the nodes, while stopping all incoming data, but the result is always the same. When reaching the bucket "html" it constantly fails after a while.I hope someone can help shed some light on the cause of these issues and let me know how to complete the rebalance. You can find the cbcollect_info zip file links below.
Here's what I see so far:
* you successfully built and installed gperftools 2.1. I'm seeing it is used (lsof + memcached memory map confirms that)
* I do see significant swap usage
* I do see some very long IO ops in stats. And erlang timeouts. Both point to swap storm
* I still see very bad tcmalloc stats (see below) on node .47. And that's part I struggle to understand. tcmalloc 2.1 is supposed to prevent this from happening. Particularly, the fix for https://code.google.com/p/gperftools/issues/detail?id=368 is supposed to at least return all those unused pages back to OS when such severe memory fragmentation occurs. But this is not what happens in your case.
* Interestingly I only see bad malloc stats from node .47 and not from other nodes. But other nodes apparently don't deal with very large items so extensively.
Can you send me malloc stats from node .47 during rebalance ? That will be output of # /opt/couchbase/bin/cbstats 127.0.0.1:11210 raw allocator -b mouseflow_html
You may want to restart service on node .47 before doing it.
Here's malloc stats from box .47
detailed: ------------------------------------------------
MALLOC: 5751436528 ( 5485.0 MiB) Bytes in use by application
MALLOC: + 26852524032 (25608.6 MiB) Bytes in page heap freelist
MALLOC: + 396512360 ( 378.1 MiB) Bytes in central cache freelist
MALLOC: + 13468944 ( 12.8 MiB) Bytes in transfer cache freelist
MALLOC: + 39827864 ( 38.0 MiB) Bytes in thread cache freelists
MALLOC: + 86208664 ( 82.2 MiB) Bytes in malloc metadata
MALLOC: ------------
MALLOC: = 33139978392 (31604.7 MiB) Actual memory used (physical + swap)
MALLOC: + 816209920 ( 778.4 MiB) Bytes released to OS (aka unmapped)
MALLOC: ------------
MALLOC: = 33956188312 (32383.1 MiB) Virtual address space used
MALLOC:
MALLOC: 443221 Spans in use
MALLOC: 24 Thread heaps in use
MALLOC: 8192 Tcmalloc page size
------------------------------------------------
Call ReleaseFreeMemory() to release freelist memory to the OS (via madvise()).
Bytes released to the OS take up virtual address space but no physical memory.
------------------------------------------------
Total size of freelists for per-thread caches,
transfer cache, and central cache, by size class
------------------------------------------------
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123 pages * 20 spans ~ 19.2 MiB; 12636.9 MiB cum; unmapped: 0.0 MiB; 36.4 MiB cum
124 pages * 14 spans ~ 13.6 MiB; 12650.5 MiB cum; unmapped: 0.0 MiB; 36.4 MiB cum
125 pages * 20 spans ~ 19.5 MiB; 12670.0 MiB cum; unmapped: 0.0 MiB; 36.4 MiB cum
126 pages * 25 spans ~ 24.6 MiB; 12694.6 MiB cum; unmapped: 0.0 MiB; 36.4 MiB cum
127 pages * 16 spans ~ 15.9 MiB; 12710.5 MiB cum; unmapped: 0.0 MiB; 36.4 MiB cum
>255 large * 1563 spans ~ 13676.5 MiB; 26387.0 MiB cum; unmapped: 742.0 MiB; 778.4 MiB cum
Thanks,Lasse Schou
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