Erick Erickson updated SOLR-11069:
    Summary: LASTPROCESSEDVERSION for CDCR is flawed when buffering is enabled  
(was: CDCR bootstrapping causes a core reload which loses the state of a 
bootstrap leading to infinite bootstrapping)

> 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
>            Assignee: Erick Erickson
> {{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 incorrect 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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