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https://issues.apache.org/jira/browse/SOLR-12291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16830012#comment-16830012
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ASF subversion and git services commented on SOLR-12291:
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Commit 5ca0602d2802d6b64186972993157a1dbf4bc1e6 in lucene-solr's branch
refs/heads/master from Mikhail Khludnev
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=5ca0602 ]
SOLR-12291: fixing premature completion of async tasks
* extract async tracking methods from OverseerCollectionMessageHandler into the
separate class
* replacing hashmap to named list to avoid entry loss
> Async prematurely reports completed status that causes severe shard loss
> ------------------------------------------------------------------------
>
> Key: SOLR-12291
> URL: https://issues.apache.org/jira/browse/SOLR-12291
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Backup/Restore, SolrCloud
> Reporter: Varun Thacker
> Assignee: Mikhail Khludnev
> Priority: Major
> Attachments: SOLR-12291.patch, SOLR-12291.patch, SOLR-12291.patch,
> SOLR-12291.patch, SOLR-12291.patch, SOLR-12291.patch, SOLR-12291.patch,
> SOLR-122911.patch
>
>
> The OverseerCollectionMessageHandler sliceCmd assumes only one replica exists
> on one node
> When multiple replicas of a slice are on the same node we only track one
> replica's async request. This happens because the async requestMap's key is
> "node_name"
> I discovered this when [~alabax] shared some logs of a restore issue, where
> the second replica got added before the first replica had completed it's
> restorecore action.
> While looking at the logs I noticed that the overseer never called
> REQUESTSTATUS for the restorecore action , almost as if it had missed
> tracking that particular async request.
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