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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-6857) Reduce number of exists() calls on the target object
Date Mon, 13 Mar 2017 20:18:42 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-6857?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Wang updated MAPREDUCE-6857:
-----------------------------------
    Target Version/s: 3.0.0-alpha3  (was: 3.0.0-alpha2)
       Fix Version/s:     (was: 3.0.0-alpha2)

> Reduce number of exists() calls on the target object
> ----------------------------------------------------
>
>                 Key: MAPREDUCE-6857
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6857
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: distcp
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Gil Vernik
>         Attachments: HADOOP-6857-002.patch
>
>
> CopyMapper.map(..) calls targetStatus = targetFS.getFileStatus(target).
> Few steps later RetriableFileCopyCommand.promoteTmpToTarget(..) will call again exists(target)
and delete if present. 
> The second exists() is useless, since if targetStatus==null it can be easily seen  if
overwrite mode is activated and so target object can be deleted.
> The propose of this patch is to delete target object by using targetStatus and thus avoid
calling exists() method.



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