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From "Rahul Sharma (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CRUNCH-51) PCollection#sort relies on using a single reducer for total order sorting
Date Wed, 19 Sep 2012 05:02:07 GMT

     [ https://issues.apache.org/jira/browse/CRUNCH-51?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rahul Sharma updated CRUNCH-51:
-------------------------------

    Attachment: CRUNCH-51.patch

Gabriel, I have fixed the sorting issue. I tried testing for some Avro data as well and then
I made some changes to the RerverseAvroComparator to make it work.  For the materalized issue,
can you please check the log that gets created for the job? I think it should have  a clear
error of what went wrong. Most probably it could be like schema not set. Or can you provide
me the test case ? I can try to run it and see the error.
                
> PCollection#sort relies on using a single reducer for total order sorting
> -------------------------------------------------------------------------
>
>                 Key: CRUNCH-51
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-51
>             Project: Crunch
>          Issue Type: Improvement
>    Affects Versions: 0.3.0
>            Reporter: Gabriel Reid
>         Attachments: 0001-CRUNCH-51-Total-Order-Sort.patch, CRUNCH-51.patch, CRUNCH-51.patch
>
>
> The total-order sorting provided by the Sort class (and therefore PCollection#sort) relies
on using a single reducer in order to provide total-order sorting. This is very inefficient
for large datasets, and should be replaced with a total order partitioner instead.
> For more information, see CRUNCH-23 (and possibly also MAPREDUCE-4574).

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