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Posted to common-issues@hadoop.apache.org by "Andrew Wang (JIRA)" <ji...@apache.org> on 2016/08/30 05:55:20 UTC

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

     [ https://issues.apache.org/jira/browse/HADOOP-13163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Wang updated HADOOP-13163:
---------------------------------
    Assignee: Rajesh Balamohan

> 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
>          Components: tools/distcp
>    Affects Versions: 2.8.0
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>            Priority: Minor
>             Fix For: 2.8.0, 3.0.0-alpha1
>
>         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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