dingshun3016 opened a new pull request, #5170:
URL: https://github.com/apache/hadoop/pull/5170
When patching the datanode's fine-grained lock, we found that the datanode
couldn't start，maybe happened deadlock，when addBlockPool, so we can remove it.
org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl#addBlockPool
get writeLock
org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl#deepCopyReplica
need readLock
because it is not the same thread, so the write lock cannot be downgraded to
a read lock
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