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From "Varun Thacker (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-11069) LASTPROCESSEDVERSION for CDCR is flawed when buffering is enabled
Date Fri, 14 Jul 2017 21:12:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-11069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16088075#comment-16088075
] 

Varun Thacker commented on SOLR-11069:
--------------------------------------

I just saw a case where restarting the source cluster triggered bootstrap. Since LASTPROCESSEDVERSION
was -1 the source ended up bootstrapping the target. Disabling buffer on source makes the
pointer move correctly.

> LASTPROCESSEDVERSION for CDCR is flawed when buffering is enabled
> -----------------------------------------------------------------
>
>                 Key: SOLR-11069
>                 URL: https://issues.apache.org/jira/browse/SOLR-11069
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: CDCR
>    Affects Versions: 7.0
>            Reporter: Amrit Sarkar
>
> {{LASTPROCESSEDVERSION}} (a.b.v. LPV) action for CDCR breaks down due to poorly initialised
and maintained buffer log for either source or target cluster core nodes.
> If buffer is enabled for cores of either source or target cluster, it return {{-1}},
*irrespective of number of entries in tlog read by the {{leader}}* node of each shard of respective
collection of respective cluster. Once disabled, it starts telling us the correct LPV for
each core.
> Due to the same flawed behavior, Update Log Synchroniser may doesn't work properly as
expected, i.e. provides correct seek to the {{non-leader}} nodes to advance at. I am not sure
whether this is an intended behavior for sync but it surely doesn't feel right.



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