Daryn Sharp created HDFS-9198:
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Summary: Coalesce IBR processing in the NN
Key: HDFS-9198
URL: https://issues.apache.org/jira/browse/HDFS-9198
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Affects Versions: 2.0.0-alpha
Reporter: Daryn Sharp
Assignee: Daryn Sharp
IBRs from thousands of DNs under load will degrade NN performance due to
excessive write-lock contention from multiple IPC handler threads. The IBR
processing is quick, so the lock contention may be reduced by coalescing
multiple IBRs into a single write-lock transaction. The handlers will also be
freed up faster for other operations.
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