Eli Collins created HDFS-3937:
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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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