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https://issues.apache.org/jira/browse/SOLR-13418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16830342#comment-16830342
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Gus Heck commented on SOLR-13418:
---------------------------------
Since our latest comments have drifted to mostly be about the patch for
SOLR-13420 I'm replying over there...
> ZkStateReader.PropsWatcher synchronizes on a string value & doesn't track zk
> version
> ------------------------------------------------------------------------------------
>
> Key: SOLR-13418
> URL: https://issues.apache.org/jira/browse/SOLR-13418
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Affects Versions: 8.0, master (9.0)
> Reporter: Gus Heck
> Assignee: Gus Heck
> Priority: Major
> Fix For: 8.1, master (9.0)
>
>
> While contemplating adding better caching to collection properties to avoid
> repeated calls to ZK from code that wishes to consult collection properties,
> I noticed that the existing PropsWatcher class is synchronizing on a string
> value for the name of a collection. Synchronizing on strings is bad practice,
> given that you never know if the string might have been interned, and
> therefore someone else might also synchronizing on the same object without
> your knowledge creating contention or even deadlocks. Also this code doesn't
> seem to be doing anything to check ZK version information, so it seems
> possible that out of order processing by threads could wind up caching out of
> date data.
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