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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Possible bug in Cassandra MapReduce
Date Sat, 19 Jun 2010 03:45:08 GMT
Looks like the end of June.

On Fri, Jun 18, 2010 at 8:38 PM, Corey Hulen <cj@earnstone.com> wrote:
> Awesome...thanks.
> I just downloaded the patch and applied it and verified it fixes our
> problems.
> what's the ETA on 0.6.3?  (debating on weather to tolerate it or maintain
> our own 0.6.2+patch).
> -Corey
>
> On Fri, Jun 18, 2010 at 8:21 PM, Jonathan Ellis <jbellis@gmail.com> wrote:
>>
>> Fixed for 0.6.3: https://issues.apache.org/jira/browse/CASSANDRA-1042
>>
>> On Fri, Jun 18, 2010 at 2:49 PM, Corey Hulen <cj@earnstone.com> wrote:
>> >
>> > We are using MapReduce to periodical verify and rebuild our secondary
>> > indexes along with counting total records.  We started to noticed double
>> > counting of unique keys on single machine standalone tests. We were
>> > finally
>> > able to reproduce the problem using
>> > the apache-cassandra-0.6.2-src/contrib/word_count example and just
>> > re-running it multiple times.  We are hoping someone can verify the bug.
>> > re-run the tests and the word count for /tmp/word_count3/part-r-00000
>> > will
>> > be 1000 +~200  and will change if you blow the data away and re-run.
>> >  Notice
>> > the setup script loops and only inserts 1000 records so we expect count
>> > to
>> > be 1000.  Once the data is generated then re-running the setup script
>> > and/or
>> > mapreduce doesn't change the number (still off).  The key is to blow all
>> > the
>> > data away and start over which will cause it to change.
>> > Can someone please verify this behavior?
>> > -Corey
>>
>>
>>
>> --
>> Jonathan Ellis
>> Project Chair, Apache Cassandra
>> co-founder of Riptano, the source for professional Cassandra support
>> http://riptano.com
>
>



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

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