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https://issues.apache.org/jira/browse/HADOOP-13163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rajesh Balamohan updated HADOOP-13163:
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Attachment: HADOOP-13163.001.patch
Attaching the patch for review. Existing test cases takes care of this code
path.
\cc [~cnauroth], [~steve_l]
> 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
> Attachments: HADOOP-13163.001.patch
>
>
> 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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