Stephen O'Donnell created HDFS-15160:
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Summary: Allow ReplicaMap and callers of ReplicaMap.replicas to
use readLock
Key: HDFS-15160
URL: https://issues.apache.org/jira/browse/HDFS-15160
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode
Affects Versions: 3.3.0
Reporter: Stephen O'Donnell
Assignee: Stephen O'Donnell
Now we have HDFS-15150, we can start to move some DN operations to use the read
lock rather than the write lock to improve concurrence. The first step is to
make the changes to ReplicaMap, as many other methods make calls to it.
This Jira switches read operations against the volume map to use the readLock
rather than the write lock.
Additionally, some methods make a call to replicaMap.replicas() (eg
getBlockReports, getFinalizedBlocks, deepCopyReplica) and only use the result
in a read only fashion, so they can also be switched to using a readLock.
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