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https://issues.apache.org/jira/browse/SOLR-7109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14320682#comment-14320682
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Mark Miller commented on SOLR-7109:
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I ran into a similar issue in SOLR-7065 with the new test I have there.
It's still exploratory, so I just took that DOWN publish out for the time being.
> Indexing threads stuck during network partition can put leader into down state
> ------------------------------------------------------------------------------
>
> Key: SOLR-7109
> URL: https://issues.apache.org/jira/browse/SOLR-7109
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.10.3, 5.0
> Reporter: Shalin Shekhar Mangar
> Fix For: Trunk, 5.1
>
>
> I found this recently while running some Jepsen tests. I found that some
> threads get stuck on zk operations for a long time in
> ZkController.updateLeaderInitiatedRecoveryState method and when they wake up
> they go ahead with setting the LIR state to down. But in the mean time, new
> leader has been elected and sometimes you'd get into a state where the leader
> itself is put into recovery causing the shard to reject all writes.
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