[jira] [Resolved] (SOLR-11216) Race condition in peerSync

["Cao Manh Dat (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-11216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Cao Manh Dat resolved SOLR-11216.
---------------------------------
       Resolution: Fixed
         Assignee: Cao Manh Dat
    Fix Version/s: 7.5
                   master (8.0)

> Race condition in peerSync
> --------------------------
>
>                 Key: SOLR-11216
>                 URL: https://issues.apache.org/jira/browse/SOLR-11216
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: 7.4
>            Reporter: Cao Manh Dat
>            Assignee: Cao Manh Dat
>            Priority: Major
>             Fix For: master (8.0), 7.5
>
>         Attachments: SOLR-11216.patch, SOLR-11216.patch, SOLR-11216.patch, SOLR-11216.patch, SOLR-11216.patch, SOLR-11216.patch, SOLR-11216.patch
>
>
> When digging into SOLR-10126. I found a case that can make peerSync fail.
> * leader and replica receive update from 1 to 4
> * replica stop
> * replica miss updates 5, 6
> * replica start recovery
> ## replica buffer updates 7, 8
> ## replica request versions from leader, 
> ## in the same time leader receive update 9, so it will return updates from 1 to 9 (for request versions) when replica get recent versions ( so it will be 1,2,3,4,5,6,7,8,9 )
> ## replica do peersync and request updates 5, 6, 9 from leader 
> ## replica apply updates 5, 6, 9. Its index does not have update 7, 8 and maxVersionSpecified for fingerprint is 9, therefore compare fingerprint will fail



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