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https://issues.apache.org/jira/browse/SOLR-16473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bruno Roustant resolved SOLR-16473.
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Fix Version/s: 9.2
Resolution: Fixed
> Race condition in shard split when a sub-shard is put in recovery state
> -----------------------------------------------------------------------
>
> Key: SOLR-16473
> URL: https://issues.apache.org/jira/browse/SOLR-16473
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Bruno Roustant
> Assignee: Bruno Roustant
> Priority: Major
> Fix For: 9.2
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> There is a race condition in shard splits code when a sub-shard is put in
> RECOVERY state and the remaining replicas are added. The problem is that the
> code does not wait to ensure the sub-shard state is indeed changed to
> RECOVERY.
> [~andyvuong] reproduced the bug by adding some artificial delay, and this
> race condition seems to be the root cause of indexing holes.
> The fix is to wait for the RECOVERY state.
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