Ahmed Hussein created HADOOP-17417:
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Summary: Reduce UGI overhead in token ops
Key: HADOOP-17417
URL: https://issues.apache.org/jira/browse/HADOOP-17417
Project: Hadoop Common
Issue Type: Improvement
Components: common, kms, performance, rpc-server, security
Reporter: Ahmed Hussein
Assignee: Ahmed Hussein
{{DelegationTokenIdentifier}} has a {{ugiCache}} but
AbstractDelegationTokenManager calls a static method {{getRemoteUser()}} which
would bypass the cache.
Performance analysis of the KMS revealed the RPC server layer is creating many
and redundant UGI instances.. UGIs are not cheap to instantiate, require
synchronization, and waste memory. Reducing instantiations will improve the
performance of the ipc readers.
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