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From "praveen sripati (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-540) Create distributed sort BSP
Date Fri, 13 Apr 2012 11:47:17 GMT

    [ https://issues.apache.org/jira/browse/HAMA-540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13253303#comment-13253303
] 

praveen sripati commented on HAMA-540:
--------------------------------------

1) It would be good to have the initial (p-1) pivots evenly distributed over the input data.
This way the processors take almost same time to complete the task. How are you planning to
get them?

In the TeraSort#readPartitions looks like the first reducer # of lines are read from the input
data. Not an efficient way.

http://svn.apache.org/repos/asf/hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/terasort/TeraSort.java

2) Slightly less than double the size of the input data is passed between the processors in
the sampling sort. If the input is 1TB, then ~2TB is transferred between the nodes. Not sure
if this is OK? It would be nice to know how much data is transferred in merge sort and quick
sort.

----

I am just getting a feel of Hama/BSP and thought of implementing sampling sort. Please do
it. I will pick the next easy one :)
                
> Create distributed sort BSP
> ---------------------------
>
>                 Key: HAMA-540
>                 URL: https://issues.apache.org/jira/browse/HAMA-540
>             Project: Hama
>          Issue Type: New Feature
>          Components: bsp, examples
>            Reporter: Thomas Jungblut
>
> For HAMA-535 we need some kind of sort framework, for various other tasks this could
be as well practical.

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