Daryn Sharp created HDFS-4532:
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Summary: RPC call queue may fill due to current user lookup
Key: HDFS-4532
URL: https://issues.apache.org/jira/browse/HDFS-4532
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 2.0.0-alpha, 0.23.0, 3.0.0
Reporter: Daryn Sharp
Assignee: Daryn Sharp
Priority: Critical
Audit logging need to invoke {{UGI.getCurrentUser}} to log the user performing
an operation. This is a synch'ed method, so audit logging is effectively
serializing the completion of concurrent read ops. Under very heavy load, RPC
throughput drops dramatically, the call queue fills with thousands of waiting
operations, and clients begin timing out. Jstack shows all but one call
handler blocked on {{UGI.getCurrentUser}}.
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