[jira] [Commented] (SOLR-11216) Make PeerSync more robust

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[jira] [Commented] (SOLR-11216) Make PeerSync more robust

JIRA jira@apache.org

    [ https://issues.apache.org/jira/browse/SOLR-11216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16511005#comment-16511005 ]

Cao Manh Dat commented on SOLR-11216:
-------------------------------------

Attached patch for anyone wants to reproduce problems of Solution 3.

> Make PeerSync more robust
> -------------------------
>
>                 Key: SOLR-11216
>                 URL: https://issues.apache.org/jira/browse/SOLR-11216
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public)
>            Reporter: Cao Manh Dat
>            Priority: Major
>         Attachments: SOLR-11216.patch, SOLR-11216.patch
>
>
> First of all, I will change the issue's title with a better name when I have.
> 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
> My idea here is why replica request update 9 (step 6) while it knows that updates with lower version ( update 7, 8 ) are on its buffering tlog. Should we request only updates that lower than the lowest update in its buffering tlog ( < 7 )?
> Someone my ask that what if replica won't receive update 9. In that case, leader will put the replica into LIR state, so replica will run recovery process again.



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