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https://issues.apache.org/jira/browse/SOLR-9278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15552320#comment-15552320
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Mark Miller commented on SOLR-9278:
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Commits are accidently logged in the dupe issue FYI: SOLR-9470
Commit ce22c2697c1342fd670e3bac460a53aef90d1d80 in lucene-solr's branch
refs/heads/master from markrmiller
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=ce22c26 ]
SOLR-9470: Index replication interactions with IndexWriter can cause deadlock.
Commit 82440f307a211d8f05fe729ec1361bcd1abd0e4e in lucene-solr's branch
refs/heads/branch_6x from markrmiller
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=82440f3 ]
SOLR-9470: Index replication interactions with IndexWriter can cause deadlock.
> Possible deadlock in replication
> --------------------------------
>
> Key: SOLR-9278
> URL: https://issues.apache.org/jira/browse/SOLR-9278
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Server
> Affects Versions: 6.2
> Environment: Linux
> Reporter: Xunlong
> Assignee: Mark Miller
> Labels: replication
> Fix For: 6.3, master (7.0)
>
> Attachments: SOLR-9278.patch
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> There is a bug in IndexFetcher for replication logic, it may cause deadlock
> issue, and it's very easy to reproduce. If you change your solrconfig to keep
> more than 1 commit points, this operation will causes 2 issues:
> 1. Slave has to download whole index directory of Master, instead of
> incremental udpates only;
> 2. If you click "replicate now" button manually, this is cause deadlock, stop
> both "indexFetcher" thread and "explicitFetcher" thread.
> The first issue is a design issue, can be worked around by keep only 1 commit
> point. But the second issue can always happen if there is some file located
> in slave's index directory, but can not be deleted by index delete policy
> (due to permission issue etc), I have fixed this issue for my service, would
> happy to contribute to Solr community to benefit others.
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