Wu Weiwei created HDFS-14523:
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Summary: Remove excess read lock for NetworkToplogy
Key: HDFS-14523
URL: https://issues.apache.org/jira/browse/HDFS-14523
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Wu Weiwei
getNumOfRacks() and getNumOfLeaves() are two high frequencies call methods for
BlockPlacementPolicy, this two methods need to get NetworkTopology read lock,
this may impact the namenode performance.
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