[jira] [Resolved] (SOLR-11069) CDCR bootstrapping can get into an infinite loop when a core is reloaded

["Erick Erickson (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-11069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Erick Erickson resolved SOLR-11069.
-----------------------------------
    Resolution: Fixed

> CDCR bootstrapping can get into an infinite loop when a core is reloaded
> ------------------------------------------------------------------------
>
>                 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: 6.2, 6.3, 6.4, 6.5, 6.6, 7.0
>            Reporter: Amrit Sarkar
>            Assignee: Erick Erickson
>             Fix For: 7.0, 6.7, 6.6.1, master (8.0), 7.1
>
>         Attachments: SOLR-11069.patch, SOLR-11069.patch, SOLR-11069.patch
>
>
> {{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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