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From "Michael Stack (Jira)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-9039) During recovery, perform assignment and distributed log replay in parallel
Date Fri, 12 Jun 2020 17:26:00 GMT

     [ https://issues.apache.org/jira/browse/HBASE-9039?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Stack resolved HBASE-9039.
----------------------------------
    Resolution: Later

> During recovery, perform assignment and distributed log replay in parallel
> --------------------------------------------------------------------------
>
>                 Key: HBASE-9039
>                 URL: https://issues.apache.org/jira/browse/HBASE-9039
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Devaraj Das
>            Assignee: Devaraj Das
>            Priority: Minor
>
> In the ServerShutDownHandler, the log replay starts only after all the regions have been
assigned. It might make sense to do the log replay as and when assignment happens for the
regions rather than wait for the batch of assignments to complete. As part of region opening,
the store files are read, and if a certain store file block is on a slow datanode, it slows
down the assignment process. Maybe this can be amortized by having the log replay in parallel.



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