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Posted to common-issues@hadoop.apache.org by "Rajesh Balamohan (JIRA)" <ji...@apache.org> on 2016/05/17 04:35:13 UTC

[jira] [Created] (HADOOP-13163) Reuse pre-computed filestatus in Distcp-CopyMapper

Rajesh Balamohan created HADOOP-13163:
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             Summary: Reuse pre-computed filestatus in Distcp-CopyMapper
                 Key: HADOOP-13163
                 URL: https://issues.apache.org/jira/browse/HADOOP-13163
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Rajesh Balamohan


https://github.com/apache/hadoop/blob/af942585a108d70e0946f6dd4c465a54d068eabf/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/CopyMapper.java#L185

targetStatus is already computed and it can be reused in checkUpdate() function. This wouldn't be a major issue in NN/HDFS, but in the case of S3 getFileStatus calls can be expensive.




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