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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9039) During recovery, perform assignment and distributed log replay in parallel
Date Thu, 25 Jul 2013 02:39:48 GMT
Devaraj Das created HBASE-9039:
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             Summary: 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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