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https://issues.apache.org/jira/browse/SOLR-13897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16985459#comment-16985459
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Shalin Shekhar Mangar commented on SOLR-13897:
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The onTermUpdates might receive updates out of order (i.e. monotonic term
versions are not guaranteed inside onTermUpdates) but it is not a problem in
the default RecoveringCoreTermWatcher implementation because it tracks the last
term that triggered recovery and returns if it is greater (or equal) to the
current term. This patch adds javadocs to the CoreTermWatcher interface and
calls out the behavior of these invocations.
> Unsafe publication of Terms object in ZkShardTerms
> --------------------------------------------------
>
> Key: SOLR-13897
> URL: https://issues.apache.org/jira/browse/SOLR-13897
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Affects Versions: 8.2, 8.3
> Reporter: Shalin Shekhar Mangar
> Priority: Major
> Fix For: master (9.0), 8.4
>
> Attachments: SOLR-13897.patch, SOLR-13897.patch
>
>
> The Terms object in ZkShardTerms is written using a write lock but reading is
> allowed freely. This is not safe and can cause visibility issues and
> associated race conditions under contention.
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