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https://issues.apache.org/jira/browse/SOLR-12291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16918638#comment-16918638
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ASF subversion and git services commented on SOLR-12291:
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Commit 8b6ca690acee929ceadd3ea7a8a504499cbfa012 in lucene-solr's branch
refs/heads/branch_7_7 from Mikhail Khludnev
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=8b6ca69 ]
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
> Components: Backup/Restore, SolrCloud
> Reporter: Varun Thacker
> Assignee: Mikhail Khludnev
> Priority: Major
> Fix For: 8.1, master (9.0)
>
> 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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