Daryn Sharp created HDFS-5239:
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Summary: Allow FSNamesystem lock fairness to be configurable
Key: HDFS-5239
URL: https://issues.apache.org/jira/browse/HDFS-5239
Project: Hadoop HDFS
Issue Type: Sub-task
Components: namenode
Affects Versions: 2.0.0-alpha, 3.0.0
Reporter: Daryn Sharp
Assignee: Daryn Sharp
The fairness of the {{FSNamesystem#fsLock}} is hardcoded to {{true}}. Using an
unfair lock provides a negligible increase to throughput. However this is due
to bottlenecks elsewhere in the system. In combination with other changes, such
as RPC layer and audit logging, preliminary tests show up to a 5X improvement
for a read heavy workload.
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