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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7603) The background replication queue initialization may not let other run
Date Mon, 12 Jan 2015 16:43:34 GMT
Kihwal Lee created HDFS-7603:
--------------------------------

             Summary: The background replication queue initialization may not let other run
                 Key: HDFS-7603
                 URL: https://issues.apache.org/jira/browse/HDFS-7603
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: rolling upgrades
            Reporter: Kihwal Lee
            Priority: Critical


The background replication queue initialization processes configured number of blocks at a
time and releases the namesystem write lock.  This was to let namenode start serving right
after a standby to active transition or leaving safe mode.  However, this does not allow others
to run much if the lock fairness is set to "unfair" for the higher throughput.

I propose adding a delay between unlocking and locking in the async repl queue init thread.



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