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From "Ben Holloway (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5504) Eternal iteration when using newer hadoop version due to next() call and empty key value
Date Mon, 22 Apr 2013 19:11:16 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13638333#comment-13638333
] 

Ben Holloway commented on CASSANDRA-5504:
-----------------------------------------

I might be seeing the same bug you originally reported now that the job has started. I can't
help but wonder if the reason none of this works is because the main codebase is now in DSE
and its all modified to work with DSE and not with hadoop.   
                
> Eternal iteration when using newer hadoop version due to next() call and empty key value
> ----------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-5504
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5504
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>    Affects Versions: 1.2.3
>            Reporter: Oleksandr Petrov
>            Priority: Critical
>         Attachments: patch2.diff, patch.diff
>
>
> Currently, when using newer hadoop versions, due to the call to 
> next(ByteBuffer key, SortedMap<ByteBuffer, IColumn> value)
> within ColumnFamilyRecordReader, because `key.clear();` is called, key is emptied. That
causes the StaticRowIterator and WideRowIterator to glitch, namely, when Iterables.getLast(rows).key
is called, key is already empty. This will cause Hadoop to request the same range again and
again all the time.
> Please see the attached patch/diff, it simply adds lastRowKey (ByteBuffer) and saves
it for the next iteration along with all the rows, this allows query for the next range to
be fully correct.
> This patch is branched from 1.2.3 version.
> Tested against Cassandra 1.2.3, with Hadoop 1.0.3, 1.0.4 and 0.20.2

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