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https://issues.apache.org/jira/browse/SOLR-12504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cassandra Targett updated SOLR-12504:
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Component/s: SolrCloud
> Leader should compute its fingerprint and retrieve recent updates in an
> atomic way
> ----------------------------------------------------------------------------------
>
> Key: SOLR-12504
> URL: https://issues.apache.org/jira/browse/SOLR-12504
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Reporter: Cao Manh Dat
> Assignee: Cao Manh Dat
> Priority: Major
>
> SOLR-11216 solved many cases in the PeerSync (in doing recovery). But there
> are still cases when PeerSync will fail because of mismatch in fingerprint
> comparison. The main reason here is fingerprint and recent versions of leader
> is not computed/retrieved in an atomic way.
> For example: when an update made into leader's tlog after fingerprint is
> computed but before recent versions are retrieved.
> Leader's fingerprint : (contains updates from 1-10)
> Leader's recent versions : (contains updates from 1-12)
> Replica's fingerprint : (contains updates from 1-12)
> --> A mismatch in fingerprint between leader and replica.
> But it seems that blocking updates in leader for {{getVersions}} operation is
> not a good idea (it will degrade indexing performance). Still struggling on
> finding a solution.
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