Hi everyone,
I need some advice how to debug slow soft commits.
We use Solr for searches in a DAM system and in similar setups, soft
commits take about one to two seconds, in this case nearly ten seconds.
Solr runs on a dedicated VM with eight cores and 64 GB RAM (16G heap),
which is common scenario with our software and the index holds about 20
million documents. Queries are as fast as expected.
This is Solr 7.5.0, stand-alone, auto hard-commit set to 60 seconds, no
explicit soft-commits but documents added with commitWhitin=5000 or 1000
depending on the use case. No warm-up queries, caches set to zero.
I enabled infostream and debug logging. Here is a little test case where I
stopped any other requests to Solr and just manually added a single
document and then posted a soft commit request.
2019-05-22 17:19:42.160 INFO (qtp26728049-20) o.a.s.u.DirectUpdateHandler2
start
commit{_version_=1634245942610755584,optimize=false,openSearcher=true,waitSearcher=true,expungeDeletes=false,softCommit=true,prepareCommit=false}
2019-05-22 17:19:42.160 DEBUG (qtp26728049-20) o.a.s.u.UpdateLog TLOG:
preSoftCommit: prevMap=1930097580 new map=1023061476
2019-05-22 17:19:42.160 DEBUG (qtp26728049-20)
o.a.s.c.CachingDirectoryFactory Reusing cached directory:
CachedDir<<refCount=1;path=/solr/core-tex73oy02hnxgx1dqc14p5o-index1;done=false>>
2019-05-22 17:19:42.160 DEBUG (qtp26728049-20)
o.a.s.c.CachingDirectoryFactory Releasing directory:
/solr/core-tex73oy02hnxgx1dqc14p5o-index1 0 false
2019-05-22 17:19:42.160 INFO (qtp26728049-20) o.a.s.u.LoggingInfoStream
[DW][qtp26728049-20]: anyChanges? numDocsInRam=1 deletes=true
hasTickets:false pendingChangesInFullFlush: false
2019-05-22 17:19:42.160 INFO (qtp26728049-20) o.a.s.u.LoggingInfoStream
[IW][qtp26728049-20]: nrtIsCurrent: infoVersion matches: false; DW changes:
true; BD changes: false
2019-05-22 17:19:42.160 INFO (qtp26728049-20) o.a.s.u.LoggingInfoStream
[IW][qtp26728049-20]: flush at getReader
... a lot of things logged here (omitted) that happen within milli-seconds
...
2019-05-22 17:19:42.168 INFO (qtp26728049-20) o.a.s.u.LoggingInfoStream
[IW][qtp26728049-20]: getReader took 8 msec
2019-05-22 17:19:47.499 INFO (qtp26728049-20) o.a.s.s.SolrIndexSearcher
Opening [Searcher@6211242f[core-tex73oy02hnxgx1dqc14p5o-index1] main]
2019-05-22 17:19:47.499 DEBUG (qtp26728049-20)
o.a.s.c.CachingDirectoryFactory incRef'ed:
CachedDir<<refCount=4;path=/solr/core-tex73oy02hnxgx1dqc14p5o-index1/index;done=false>>
2019-05-22 17:19:50.233 DEBUG (qtp26728049-20) o.a.s.s.SolrIndexSearcher
Closing [Searcher@78d9785[core-tex73oy02hnxgx1dqc14p5o-index1] realtime]
2019-05-22 17:19:50.233 INFO (qtp26728049-20) o.a.s.u.LoggingInfoStream
[IW][qtp26728049-20]: decRefDeleter for NRT reader version=10560246
segments=_22lfz(7.5.0):c1033782/56603:delGen=2772
_22lfp(7.5.0):c1025574/39055:delGen=2113
_22lfr(7.5.0):c759249/32191:delGen=1386
_26q49(7.5.0):c923418/29825:delGen=958
_22lfx(7.5.0):c684064/30952:delGen=1098
_22lfv(7.5.0):c856317/78777:delGen=928
_22lg1(7.5.0):c1062384/188447:delGen=1750
_22lg0(7.5.0):c561881/1480:delGen=386
_22lg5(7.5.0):c1104218/1004:delGen=139 _22lgh(7.5.0):c1156482/46:delGen=33
_22lgf(7.5.0):c626273/27:delGen=19 _22lfy(7.5.0):c697224/6:delGen=6
_22lgd(7.5.0):c399283/6:delGen=3 _22lgg(7.5.0):c482373/3:delGen=3
_22lg4(7.5.0):c656746/2:delGen=2 _22lgc(7.5.0):c664274/3:delGen=3
_22lg7(7.5.0):c703377 _22lfu(7.5.0):c700340/3:delGen=3
_22lg2(7.5.0):c743334 _22lg6(7.5.0):c1091387/44659:delGen=946
_22lfs(7.5.0):c845018 _22lg8(7.5.0):c675649 _22lg9(7.5.0):c686292
_22lft(7.5.0):c636751/1004:delGen=300 _22lgb(7.5.0):c664531
_22lga(7.5.0):c647696/1:delGen=1 _22lge(7.5.0):c659794
_22lfw(7.5.0):c568537/1:delGen=1 _22lg3(7.5.0):c837568/1426:delGen=423
_26r20(7.5.0):c63899/10456:delGen=257 _273qn(7.5.0):c39076/8075:delGen=323
_27q6g(7.5.0):c40830/8111:delGen=195 _27aii(7.5.0):c30182/6777:delGen=287
_27tkq(7.5.0):c57620/6234:delGen=162 _27jrm(7.5.0):c33298/4797:delGen=202
_280zq(7.5.0):c60476/2341:delGen=173 _28h7x(7.5.0):c48570/453:delGen=35
_28c75(7.5.0):c29536/1088:delGen=47 _28h71(7.5.0):c1191/138:delGen=5
_28idl(7.5.0):c782/57:delGen=6 _28ihc(7.5.0):c5398/348:delGen=9
_28ig3(7.5.0):c1118/302:delGen=4 _28j1s(7.5.0):c917/269:delGen=2
_28iu9(7.5.0):c758/129:delGen=4 _28j23(7.5.0):c567/70:delGen=2
_28j3j(7.5.0):c802/11:delGen=1 _28j3u(7.5.0):c697/11:delGen=2
_28iz5(7.5.0):c858/116:delGen=4 _28j2n(7.5.0):c566/78:delGen=1
_28j3t(7.5.0):C20/11:delGen=1 _28j3v(7.5.0):C13/8:delGen=1 _28j3y(7.5.0):C1
2019-05-22 17:19:50.234 DEBUG (qtp26728049-20)
o.a.s.c.CachingDirectoryFactory Releasing directory:
/solr/core-tex73oy02hnxgx1dqc14p5o-index1/index 3 false
2019-05-22 17:19:50.234 INFO (qtp26728049-20) o.a.s.u.DirectUpdateHandler2
end_commit_flush
2019-05-22 17:19:50.234 DEBUG
(searcherExecutor-10-thread-1-processing-x:core-tex73oy02hnxgx1dqc14p5o-index1)
o.a.s.s.SolrIndexSearcher autowarming
[Searcher@6211242f[core-tex73oy02hnxgx1dqc14p5o-index1]
main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_22lfz(7.5.0):c1033782/56603:delGen=2772)
... <shortened> ...Uninverting(_28j3z(7.5.0):C1)))}] from
[Searcher@680b1764[core-tex73oy02hnxgx1dqc14p5o-index1]
main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_22lfz(7.5.0):c1033782/56603:delGen=2772)
... <shortened> ... Uninverting(_28j3y(7.5.0):C1)))}]
fieldValueCache{lookups=0, hits=0, cumulative_evictions=0, size=0,
hitratio=0.0, evictions=0, cumulative_lookups=0, cumulative_hitratio=0.0,
warmupTime=0, inserts=0, cumulative_inserts=0, cumulative_hits=0}
2019-05-22 17:19:50.234 DEBUG
(searcherExecutor-10-thread-1-processing-x:core-tex73oy02hnxgx1dqc14p5o-index1)
o.a.s.s.SolrIndexSearcher autowarming result for
[Searcher@6211242f[core-tex73oy02hnxgx1dqc14p5o-index1]
main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_22lfz(7.5.0):c1033782/56603:delGen=2772)
... Uninverting(_28j3z(7.5.0):C1)))}]
fieldValueCache
2019-05-22 17:19:50.234 DEBUG
(searcherExecutor-10-thread-1-processing-x:core-tex73oy02hnxgx1dqc14p5o-index1)
o.a.s.s.SolrIndexSearcher autowarming
[Searcher@6211242f[core-tex73oy02hnxgx1dqc14p5o-index1]
main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_22lfz(7.5.0):c1033782/56603:delGen=2772)
... <shortened> ... Uninverting(_28j3z(7.5.0):C1)))}] from
[Searcher@680b1764[core-tex73oy02hnxgx1dqc14p5o-index1]
main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_22lfz(7.5.0):c1033782/56603:delGen=2772)
... <shortened> ... Uninverting(_28j3y(7.5.0):C1)))}]
filterCache{lookups=0, hits=0, cumulative_evictions=0, size=0,
hitratio=0.0, evictions=0, cumulative_lookups=0, cumulative_hitratio=0.0,
warmupTime=0, inserts=0, cumulative_inserts=0, cumulative_hits=0}
2019-05-22 17:19:50.234 DEBUG
(searcherExecutor-10-thread-1-processing-x:core-tex73oy02hnxgx1dqc14p5o-index1)
o.a.s.s.SolrIndexSearcher autowarming result for
[Searcher@6211242f[core-tex73oy02hnxgx1dqc14p5o-index1]
main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_22lfz(7.5.0):c1033782/56603:delGen=2772)
... <shortened> ... Uninverting(_28j3z(7.5.0):C1)))}]
filterCache
2019-05-22 17:19:50.235 DEBUG
(searcherExecutor-10-thread-1-processing-x:core-tex73oy02hnxgx1dqc14p5o-index1)
o.a.s.s.SolrIndexSearcher autowarming
[Searcher@6211242f[core-tex73oy02hnxgx1dqc14p5o-index1]
main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_22lfz(7.5.0):c1033782/56603:delGen=2772)
... <shortened> ... Uninverting(_28j3z(7.5.0):C1)))}] from
[Searcher@680b1764[core-tex73oy02hnxgx1dqc14p5o-index1]
main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_22lfz(7.5.0):c1033782/56603:delGen=2772)
... Uninverting(_28j3y(7.5.0):C1)))}]
queryResultCache{lookups=3, hits=2, cumulative_evictions=0, size=1,
hitratio=0.67, evictions=0, cumulative_lookups=865,
cumulative_hitratio=0.97, warmupTime=0, inserts=1, cumulative_inserts=29,
cumulative_hits=836}
2019-05-22 17:19:50.235 DEBUG
(searcherExecutor-10-thread-1-processing-x:core-tex73oy02hnxgx1dqc14p5o-index1)
o.a.s.s.SolrIndexSearcher autowarming result for
[Searcher@6211242f[core-tex73oy02hnxgx1dqc14p5o-index1]
main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_22lfz(7.5.0):c1033782/56603:delGen=2772)
... Uninverting(_28j3z(7.5.0):C1)))}]
queryResultCache
2019-05-22 17:19:50.235 DEBUG
(searcherExecutor-10-thread-1-processing-x:core-tex73oy02hnxgx1dqc14p5o-index1)
o.a.s.s.SolrIndexSearcher autowarming
[Searcher@6211242f[core-tex73oy02hnxgx1dqc14p5o-index1]
main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_22lfz(7.5.0):c1033782/56603:delGen=2772)
... <shortened> ... Uninverting(_28j3z(7.5.0):C1)))}] from
[Searcher@680b1764[core-tex73oy02hnxgx1dqc14p5o-index1]
main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_22lfz(7.5.0):c1033782/56603:delGen=2772)
... <shortened> ... Uninverting(_28j3y(7.5.0):C1)))}]
documentCache{lookups=0, hits=0, cumulative_evictions=0, size=0,
hitratio=0.0, evictions=0, cumulative_lookups=0, cumulative_hitratio=0.0,
warmupTime=0, inserts=0, cumulative_inserts=0, cumulative_hits=0}
2019-05-22 17:19:50.235 DEBUG
(searcherExecutor-10-thread-1-processing-x:core-tex73oy02hnxgx1dqc14p5o-index1)
o.a.s.s.SolrIndexSearcher autowarming result for
[Searcher@6211242f[core-tex73oy02hnxgx1dqc14p5o-index1]
main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_22lfz(7.5.0):c1033782/56603:delGen=2772)
... Uninverting(_28j3z(7.5.0):C1)))}]
documentCache
2019-05-22 17:19:50.236 INFO
(searcherExecutor-10-thread-1-processing-x:core-tex73oy02hnxgx1dqc14p5o-index1)
o.a.s.c.SolrCore [core-tex73oy02hnxgx1dqc14p5o-index1] Registered new
searcher Searcher@6211242f[core-tex73oy02hnxgx1dqc14p5o-index1]
main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_22lfz(7.5.0):c1033782/56603:delGen=2772)
... <shortened> ... Uninverting(_28j3z(7.5.0):C1)))}
2019-05-22 17:19:50.237 DEBUG
(searcherExecutor-10-thread-1-processing-x:core-tex73oy02hnxgx1dqc14p5o-index1)
o.a.s.s.SolrIndexSearcher Closing
Searcher@680b1764[core-tex73oy02hnxgx1dqc14p5o-index1]
main
fieldValueCache{lookups=0, hits=0, cumulative_evictions=0, size=0,
hitratio=0.0, evictions=0, cumulative_lookups=0, cumulative_hitratio=0.0,
warmupTime=0, inserts=0, cumulative_inserts=0, cumulative_hits=0}
filterCache{lookups=0, hits=0, cumulative_evictions=0, size=0,
hitratio=0.0, evictions=0, cumulative_lookups=0, cumulative_hitratio=0.0,
warmupTime=0, inserts=0, cumulative_inserts=0, cumulative_hits=0}
queryResultCache{lookups=3, hits=2, cumulative_evictions=0, size=1,
hitratio=0.67, evictions=0, cumulative_lookups=865,
cumulative_hitratio=0.97, warmupTime=0, inserts=1, cumulative_inserts=29,
cumulative_hits=836}
documentCache{lookups=0, hits=0, cumulative_evictions=0, size=0,
hitratio=0.0, evictions=0, cumulative_lookups=0, cumulative_hitratio=0.0,
warmupTime=0, inserts=0, cumulative_inserts=0, cumulative_hits=0}
2019-05-22 17:19:50.237 INFO
(searcherExecutor-10-thread-1-processing-x:core-tex73oy02hnxgx1dqc14p5o-index1)
o.a.s.u.LoggingInfoStream
[IW][searcherExecutor-10-thread-1-processing-x:core-tex73oy02hnxgx1dqc14p5o-index1]:
decRefDeleter for NRT reader version=10560244
segments=_22lfz(7.5.0):c1033782/56603:delGen=2772
_22lfp(7.5.0):c1025574/39055:delGen=2113
_22lfr(7.5.0):c759249/32191:delGen=1386
_26q49(7.5.0):c923418/29825:delGen=958
_22lfx(7.5.0):c684064/30952:delGen=1098
_22lfv(7.5.0):c856317/78777:delGen=928
_22lg1(7.5.0):c1062384/188447:delGen=1750
_22lg0(7.5.0):c561881/1480:delGen=386
_22lg5(7.5.0):c1104218/1004:delGen=139 _22lgh(7.5.0):c1156482/46:delGen=33
_22lgf(7.5.0):c626273/27:delGen=19 _22lfy(7.5.0):c697224/6:delGen=6
_22lgd(7.5.0):c399283/6:delGen=3 _22lgg(7.5.0):c482373/3:delGen=3
_22lg4(7.5.0):c656746/2:delGen=2 _22lgc(7.5.0):c664274/3:delGen=3
_22lg7(7.5.0):c703377 _22lfu(7.5.0):c700340/3:delGen=3
_22lg2(7.5.0):c743334 _22lg6(7.5.0):c1091387/44659:delGen=946
_22lfs(7.5.0):c845018 _22lg8(7.5.0):c675649 _22lg9(7.5.0):c686292
_22lft(7.5.0):c636751/1004:delGen=300 _22lgb(7.5.0):c664531
_22lga(7.5.0):c647696/1:delGen=1 _22lge(7.5.0):c659794
_22lfw(7.5.0):c568537/1:delGen=1 _22lg3(7.5.0):c837568/1426:delGen=423
_26r20(7.5.0):c63899/10456:delGen=257 _273qn(7.5.0):c39076/8075:delGen=323
_27q6g(7.5.0):c40830/8111:delGen=195 _27aii(7.5.0):c30182/6777:delGen=287
_27tkq(7.5.0):c57620/6234:delGen=162 _27jrm(7.5.0):c33298/4797:delGen=202
_280zq(7.5.0):c60476/2341:delGen=173 _28h7x(7.5.0):c48570/453:delGen=35
_28c75(7.5.0):c29536/1088:delGen=47 _28h71(7.5.0):c1191/138:delGen=5
_28idl(7.5.0):c782/57:delGen=6 _28ihc(7.5.0):c5398/348:delGen=9
_28ig3(7.5.0):c1118/302:delGen=4 _28j1s(7.5.0):c917/269:delGen=2
_28iu9(7.5.0):c758/129:delGen=4 _28j23(7.5.0):c567/70:delGen=2
_28j3j(7.5.0):c802/11:delGen=1 _28j3u(7.5.0):c697/11:delGen=2
_28iz5(7.5.0):c858/116:delGen=4 _28j2n(7.5.0):c566/78:delGen=1
_28j3t(7.5.0):C20/11:delGen=1 _28j3v(7.5.0):C13/8:delGen=1 _28j3y(7.5.0):C1
2019-05-22 17:19:50.237 DEBUG
(searcherExecutor-10-thread-1-processing-x:core-tex73oy02hnxgx1dqc14p5o-index1)
o.a.s.c.CachingDirectoryFactory Releasing directory:
/solr/core-tex73oy02hnxgx1dqc14p5o-index1/index 2 false
2019-05-22 17:19:50.237 DEBUG (qtp26728049-20) [
x:core-tex73oy02hnxgx1dqc14p5o-index1] o.a.s.u.p.LogUpdateProcessorFactory
PRE_UPDATE FINISH {{params(),defaults(wt=xml)}}
2019-05-22 17:19:50.237 INFO (qtp26728049-20) [
x:core-tex73oy02hnxgx1dqc14p5o-index1] o.a.s.u.p.LogUpdateProcessorFactory
[core-tex73oy02hnxgx1dqc14p5o-index1] webapp=/solr path=/update
params={}{commit=} 0 8078
You see the part (line 10 from the log excerpt) where it spends approx.
five seconds without logging anything.
Now I am aware that there could be several reasons for it, but it would
probably help me I knew what is actually being done in that part of code
where it is silent so I can look further.
This is not GC related, btw, this was one of the first things I checked and
the pause is always at the same place and it is always taking approx. the
same time.
Thanks,
André
