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From "Jeremy Hanna (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4593) Reading the ByteBuffer key from a map job causes an infinite fetch loop
Date Fri, 31 Aug 2012 04:07:07 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13445627#comment-13445627
] 

Jeremy Hanna commented on CASSANDRA-4593:
-----------------------------------------

It may be worth adding to the MapReduce or Troubleshooting section of http://wiki.apache.org/cassandra/HadoopSupport.
 We were bitten by something like this at a previous job and it was hard to track down.
                
> Reading the ByteBuffer key from a map job causes an infinite fetch loop
> -----------------------------------------------------------------------
>
>                 Key: CASSANDRA-4593
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4593
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>    Affects Versions: 1.1.2
>            Reporter: Ben Frank
>         Attachments: cassandra-1.1-4593.txt
>
>
> Reading the ByteBuffer key from a map job empties the buffer. One of these key buffers
is later used in ColumnFamilyRecordReader to figure out the last token that was received,
then using that as a start point to fetch more rows. With a now empty buffer, the token defaults
to the start of the range and thus the end of the data is never reached.

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