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https://issues.apache.org/jira/browse/SOLR-12291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16757719#comment-16757719
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Mikhail Khludnev commented on SOLR-12291:
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[^SOLR-12291.patch] just replaces map with multi map. It has a test checks per
core responses in clumsy REQUESTSTATUS response.
Also, I want to clarify impact for users: async operations with large
collections are broken.
> OverseerCollectionMessageHandler sliceCmd assumes only one replica exists on
> each node
> --------------------------------------------------------------------------------------
>
> 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
> Priority: Major
> Attachments: 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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