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From "Oleksandr Petrov (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 18:15:16 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13638254#comment-13638254
] 

Oleksandr Petrov commented on CASSANDRA-5504:
---------------------------------------------

Hm... That's quite weird. 
Maybe there's something different with Thrift.

I've seen people having trouble because of the message size, too, though. There're two settings,
one for framed and one non-framed thrift.
                
> 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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