[jira] [Created] (HDFS-9441) Do not call construct path string when choosing block placement targets

["Tsz Wo Nicholas Sze (JIRA)" <ji...@apache.org>]

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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