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https://issues.apache.org/jira/browse/SOLR-16416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17619735#comment-17619735
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Houston Putman commented on SOLR-16416:
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So looking at the errors, the issue is that the {{JettySolrRunner}} has not
registered the Solr handlers when the OverseerNodePrioritizer decides to send
the overseer request to it. This NodePrioritization stems from an overseer
action sent from the end of {{CoreContainer.load()}}. If we make sure that the
{{JettySolrRunner}} has registered the Solr handlers as soon as this is called,
we should be safe.
I see you've done a lot of work here [~gus], any suggestions?
> Fix silently failing Overseer Election joinAtHead during
> testDesignatedOverseerRestarts
> ---------------------------------------------------------------------------------------
>
> Key: SOLR-16416
> URL: https://issues.apache.org/jira/browse/SOLR-16416
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Houston Putman
> Priority: Major
>
> OverseerRolesTest.testDesignatedOverseerRestarts has been failing
> consistently (around 2.5% of the time). I think this is because
> LeaderElection.joinElection does not respect the joinAtHead flag, if
> connectionIssues happen while setting the leader election nodes.
> LeaderElection does not use the automatic retryOnConnLoss flags when doing zk
> operations. Instead, it waits for an error to come back, and it handles the
> retry itself. This is fine for the normal case, because it checks if node is
> represented in the leaderElection child nodes, and if so it ignores the
> connection loss. However when doing joinAtHead, if the childNode exists, but
> isn't at the place it should be, then the manual retry should be exercised.
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