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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-11216) Race condition in peerSync
Date Tue, 03 Jul 2018 02:04:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-11216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16530683#comment-16530683
] 

ASF subversion and git services commented on SOLR-11216:
--------------------------------------------------------

Commit d38a1753d5f5a5e265743d262a6e158d0bdfb870 in lucene-solr's branch refs/heads/master
from [~caomanhdat]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=d38a1753 ]

SOLR-11216: Fix test failures, since the new PeerSyncWithLeader won't open a realtime searcher
everytime


> 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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