David Mollitor created HDFS-14863:
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Summary: Remove Synchronization From BlockPlacementPolicyDefault
Key: HDFS-14863
URL: https://issues.apache.org/jira/browse/HDFS-14863
Project: Hadoop HDFS
Issue Type: Improvement
Components: block placement
Affects Versions: 3.2.0
Reporter: David Mollitor
Assignee: David Mollitor
https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java#L1010
The {{clusterMap}} has its own internal synchronization. Also, these are only
read operations so any changes applied to the {{clusterMap}} from another
thread will be applied since no other thread synchronizes on the {{clusterMap}}
itself (that I could find).
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