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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3937) The BlockManager should not use the FSN lock
Date Fri, 14 Sep 2012 06:06:07 GMT
Eli Collins created HDFS-3937:
---------------------------------

             Summary: The BlockManager should not use the FSN lock
                 Key: HDFS-3937
                 URL: https://issues.apache.org/jira/browse/HDFS-3937
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: name-node
            Reporter: Eli Collins


Like HDFS-2206 but for the BM. The BM currently calls into the FSN to acquire it's write lock,
it looks like this is only needed for synchronization of it's local structures, in which case
it can have it's own RW lock. This helps us further decouple block and namespace management,
and also avoids scenarios like HDFS-3936 where the FSN holds the lock and calls into BM which
may be blocked trying to acquire the FSN lock.

Per Todd's comment in HDFS-2206 we should do this as part of revisiting NN locking (HDFS-2184)
vs just a local change.   

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