[jira] [Commented] (HBASE-26969) Eliminate MOB renames when SFT is enabled

["Huaxiang Sun (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-26969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17579144#comment-17579144 ] 

Huaxiang Sun commented on HBASE-26969:
--------------------------------------

We are planing to spin 2.5.0 RC next Monday, [~bszabolcs] , do you think it can be merged by then? Otherwise, it will push out o 2.5.1.

> Eliminate MOB renames when SFT is enabled
> -----------------------------------------
>
>                 Key: HBASE-26969
>                 URL: https://issues.apache.org/jira/browse/HBASE-26969
>             Project: HBase
>          Issue Type: Sub-task
>          Components: mob
>    Affects Versions: 2.5.0, 3.0.0-alpha-3
>            Reporter: Szabolcs Bukros
>            Assignee: Szabolcs Bukros
>            Priority: Major
>             Fix For: 2.5.0, 3.0.0-alpha-4
>
>
> MOB file compaction and flush still relies on renames even when SFT is enabled.
> My proposed changes are:
>  * when requireWritingToTmpDirFirst is false during mob flush/compact instead of using the temp writer we should create a different writer using a {color:#000000}StoreFileWriterCreationTracker that writes directly to the mob store folder{color}
>  * {color:#000000}these StoreFileWriterCreationTracker should be stored in the MobStore. This would requires us to extend MobStore with a createWriter and a finalizeWriter method to handle this{color}
>  * {color:#000000}refactor {color}MobFileCleanerChore to run on the RS instead on Master to allow access to the {color:#000000}StoreFileWriterCreationTracker{color}s to make sure the currently written files are not cleaned up



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