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From "Harsh J (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HADOOP-5693) The distcp command is working slower in trunk when compared to hadoop-0.18.3
Date Thu, 29 Dec 2011 07:08:30 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harsh J resolved HADOOP-5693.
-----------------------------

    Resolution: Incomplete

This has gone stale. Please reopen if you feel this is still a real issue. Could also be the
other way round though - that reads became faster over hftp?
                
> The distcp command is working slower in trunk when compared to hadoop-0.18.3
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-5693
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5693
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.20.0
>         Environment: cluster is brought up with hod in both 0.18.3 and 0.20  versions
>            Reporter: Iyappan Srinivasan
>
> 1st scenario :
> Source cluster (3 slaves) is hadoop-0.18.3 and destination cluster is trunk (3 slaves).
>  a) The source has 3 files in a  directory equaling 0.4 GB
>  b) distcp is used to copy these contents to a  destination directory.
> (bin/hadoop --config ~/cluster_dir distcp -update -delete hftp://<IPFQDN>:<port>//dir1/file1
hdfs://<IPFQDN:PORT>//copied/)
>  c) It takes 34 seconds
> 2nd scenario :
> Source cluster is trunk. and destination cluster (3 slaves) is hadoop-0.18.3
>  a) The source has 3 files in a  directory equaling 0.4 GB
>  b) distcp is used to copy these contents to a  destination directory.
>  c) It takes 19 seconds
> From this we can conclude, In the latest trunk, distcp has considerabley slowed down
( around 78%).

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