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From "Mikhail Khludnev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-12291) OverseerCollectionMessageHandler sliceCmd assumes only one replica exists on each node
Date Thu, 31 Jan 2019 20:59:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-12291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16757719#comment-16757719
] 

Mikhail Khludnev commented on SOLR-12291:
-----------------------------------------

[^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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