Tsz Wo Nicholas Sze created HDFS-9441:
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Summary: Do not call construct path string when choosing block
placement targets
Key: HDFS-9441
URL: https://issues.apache.org/jira/browse/HDFS-9441
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Reporter: Tsz Wo Nicholas Sze
Assignee: Tsz Wo Nicholas Sze
Priority: Minor
- INodeFile.getName() is expensive since it involves quite a few string
operations. The method is called in both ReplicationWork and ErasureCodingWork
but the default BlockPlacementPolicy does not use the returned string. We
should simply pass BlockCollection to reduce unnecessary computation when using
the default BlockPlacementPolicy.
- Another improvement: the return type of FSNamesystem.getBlockCollection
should be changed to INodeFile since it always returns an INodeFile object.
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