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Posted to dev@lucene.apache.org by "Cao Manh Dat (JIRA)" <ji...@apache.org> on 2018/05/02 10:49:00 UTC
[jira] [Commented] (SOLR-10398) Multiple LIR requests can fail
PeerSync even if it succeeds
[ https://issues.apache.org/jira/browse/SOLR-10398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16460861#comment-16460861 ]
Cao Manh Dat commented on SOLR-10398:
-------------------------------------
Right [~varunthacker], this problem is fixed by SOLR-11702
> Multiple LIR requests can fail PeerSync even if it succeeds
> -----------------------------------------------------------
>
> Key: SOLR-10398
> URL: https://issues.apache.org/jira/browse/SOLR-10398
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Varun Thacker
> Priority: Major
> Fix For: 7.3
>
>
> I've seen a scenario where multiple LIRs happen around the same time.
> In this case even if PeerSync succeeded we ended up failing causing a full index fetch.
> Sequence of events:
> T1: Leader puts replica in LIR and replica's LIRState as DOWN
> T2: Replica begins PeerSync and LIRState changes
> T3: Leader puts replica in LIR again and replica's LIRState is set to DOWN
> T4: PeerSync from T1 succeeds and examines it's own LIRState which is now DOWN and fails triggering a full replication
> Log snippet
> T1 from the Leader Logs
> {code}
> solr.log.2:12779:2017-03-23 03:03:18.706 INFO (qtp1076677520-9812) [c:test s:shard73 r:core_node44 x:test_shard73_replica1] o.a.s.c.ZkController Put replica core=test_shard73_replica2 coreNodeName=core_node247 on server:8993_solr into leader-initiated recovery.
> {code}
> T2 from the replica logs:
> {code}
> solr.log.1:2017-03-23 03:03:26.724 INFO (RecoveryThread-test_shard73_replica2) [c:test s:shard73 r:core_node247 x:test_shard73_replica2] o.a.s.c.RecoveryStrategy Attempting to PeerSync from http://server:8983/solr/test_shard73_replica1/ - recoveringAfterStartup=false
> {code}
> T3 from the Leader Logs
> {code}
> solr.log.2:2017-03-23 03:03:43.268 INFO (qtp1076677520-9796) [c:test s:shard73 r:core_node44 x:test_shard73_replica1] o.a.s.c.ZkController Put replica core=test_shard73_replica2 coreNodeName=core_node247 on server:8993_solr into leader-initiated recovery.
> {code}
> T4 from the replica logs:
> {code}
> 2017-03-23 03:05:38.009 INFO (RecoveryThread-test_shard73_replica2) [c:test s:shard73 r:core_node247 x:test_shard73_replica2] o.a.s.c.RecoveryStrategy PeerSync Recovery was successful - registering as Active.
> 2017-03-23 03:05:38.012 ERROR (RecoveryThread-test_shard73_replica2) [c:test s:shard73 r:core_node247 x:test_shard73_replica2] o.a.s.c.RecoveryStrategy Error while trying to recover.:org.apache.solr.common.SolrException: Cannot publish state of core 'test_shard73_replica2' as active without recovering first!
> at org.apache.solr.cloud.ZkController.publish(ZkController.java:1179)
> at org.apache.solr.cloud.ZkController.publish(ZkController.java:1135)
> at org.apache.solr.cloud.ZkController.publish(ZkController.java:1131)
> at org.apache.solr.cloud.RecoveryStrategy.doRecovery(RecoveryStrategy.java:415)
> at org.apache.solr.cloud.RecoveryStrategy.run(RecoveryStrategy.java:227)
> 2017-03-23 03:05:47.014 INFO (RecoveryThread-test_shard73_replica2) [c:test s:shard73 r:core_node247 x:test_shard73_replica2] o.a.s.h.IndexFetcher Starting download to NRTCachingDirectory(MMapDirectory@/data4/test_shard73_replica2/data/index.20170323030546697 lockFactory=org.apache.lucene.store.NativeFSLockFactory@4aa1e5c0; maxCacheMB=48.0 maxMergeSizeMB=4.0) fullCopy=true
> {code}
> I don't know whats the best approach to tackle the problem is but I'll post suggestions after doing some research. I wanted to create the Jira to track the issue
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