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From Alex Burkoff <ABurk...@clearpathnet.com>
Subject RE: ColumnFamilyOutputFormat and mapreduce.output.columnfamilyoutputformat.batch.threshold 0.70beta1
Date Wed, 08 Sep 2010 22:41:57 GMT
With the trunk version and given patches I am now getting following exception:

10/09/08 22:39:14 WARN mapred.LocalJobRunner: job_local_0001
java.lang.ClassCastException: [B cannot be cast to java.nio.ByteBuffer
        at org.apache.cassandra.hadoop.ColumnFamilyRecordWriter.write(ColumnFamilyRecordWriter.java:68)
        at org.apache.hadoop.mapred.ReduceTask$NewTrackingRecordWriter.write(ReduceTask.java:508)
        at org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80)
        at cassandratest.Main$TReducer.reduce(Main.java:132)
        at cassandratest.Main$TReducer.reduce(Main.java:113)
        at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
        at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:566)
        at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:408)
        at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:216)
10/09/08 22:39:14 INFO mapred.JobClient:  map 100% reduce 0%

Alex.
________________________________________
From: Jonathan Ellis [jbellis@gmail.com]
Sent: Wednesday, September 08, 2010 2:26 PM
To: user@cassandra.apache.org
Subject: Re: ColumnFamilyOutputFormat and mapreduce.output.columnfamilyoutputformat.batch.threshold
0.70beta1

Try the patches on
https://issues.apache.org/jira/browse/CASSANDRA-1434 (or wait until
they're committed to trunk, then try a nightly build)

On Wed, Sep 8, 2010 at 4:18 PM, Alex Burkoff <ABurkoff@clearpathnet.com> wrote:
> Guys,
>
> I was testing ColumnFamilyOutputFormat and found that only columns from the last Reduce
> invocation get stored when mapreduce.output.columnfamilyoutputformat.batch.threshold
has
> the default value. Setting it to 1 changes the behavior, and all data is stored then.
Is it the
> intended behavior, or am I missing something ?
>
> Best regards,
>
> Alex Burkoff
>



--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com

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