hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Yoram Arnon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-229) hadoop cp should generate a better number of map tasks
Date Thu, 18 May 2006 00:24:05 GMT
hadoop cp should generate a better number of map tasks 
-------------------------------------------------------

         Key: HADOOP-229
         URL: http://issues.apache.org/jira/browse/HADOOP-229
     Project: Hadoop
        Type: Bug

  Components: fs  
    Reporter: Yoram Arnon
 Assigned to: Milind Bhandarkar 
    Priority: Minor


hadoop cp currently assigns 10 files to copy per map task.
in case of a small number of large files on a large cluster (say 300 files of 30GB each on
a 300 node cluster), this results in long execution times.
better would be to assign files per task such that the entire cluster is utilized: one file
per map, with a cap of 10000 maps total, so as not to over burden the job tracker.

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
   http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see:
   http://www.atlassian.com/software/jira


Mime
View raw message