Daryn Sharp created HDFS-14534:
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Summary: NetworkTopology's fair lock has poor performance
Key: HDFS-14534
URL: https://issues.apache.org/jira/browse/HDFS-14534
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Reporter: Daryn Sharp
The {{NetworkTopology#netlock}} is a heavily accessed lock. HADOOP-15486 made
the lock fair to avoid starvation of a re-registering datanode that holds the
fsn write lock while waiting for the topology write lock. If nodes start
flapping and re-registering, the contention with all other handlers becomes
extreme.
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