[jira] [Commented] (SOLR-11718) Deprecate CDCR Buffer APIs

["Varun Thacker (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-11718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16283114#comment-16283114 ] 

Varun Thacker commented on SOLR-11718:
--------------------------------------

We should do the following here :

- remove the buffer from sample solrconfig from both source and target . Add a deprecation warning in the ref guide for the enable buffer and disable buffer API
- change default from enabled to disabled in the code
- leave a comment in CdcrRequestHandler handleEnableBufferAction/handleDisableBufferAction to remove it in the next 8.0 . We could perhaps remove it earlier as well (not sure) but we don't need to tackle that in this Jira

> Deprecate CDCR Buffer APIs
> --------------------------
>
>                 Key: SOLR-11718
>                 URL: https://issues.apache.org/jira/browse/SOLR-11718
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: CDCR
>    Affects Versions: 7.1
>            Reporter: Amrit Sarkar
>             Fix For: 7.2
>
>         Attachments: SOLR-11652.patch
>
>
> Kindly see the discussion on SOLR-11652.
> Today, if we see the current CDCR documentation page, buffering is "disabled" by default in both source and target. We don't see any purpose served by Cdcr buffering and it is quite an overhead considering it can take a lot heap space (tlogs ptr) and forever retention of tlogs on the disk when enabled. Also today, even if we disable buffer from API on source , considering it was enabled at startup, tlogs are never purged on leader node of shards of source, refer jira: SOLR-11652



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