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