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https://issues.apache.org/jira/browse/CASSANDRA-5085?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis reopened CASSANDRA-5085:
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> Hadoop map reduce job work wrong with big wide rows
> ----------------------------------------------------
>
> Key: CASSANDRA-5085
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5085
> Project: Cassandra
> Issue Type: Bug
> Components: Hadoop
> Affects Versions: 1.1.1
> Environment: Centos 6.0, 7 node cluster (24gb ram, 16 core) ,
> replication factor=2
> Reporter: tu nguyen khac
>
> I have 7 nodes cassandra (1.1.1) and hadoop (1.03) cluster ( tasktracker
> install on every cassandra node).
> and my column family use wide row pattern. 1 row contains about 200k columns
> (max about 300k).
> My problem is that: when i use Hadoop to run analytic jobs ( count numbers of
> occurrence of a something in data) the result i received is wrong ( result is
> too lower as I expected in test records)
> there 's one strange when we monitoring on job tracker is map progress task
> indicate wrong ( in my image below ) , And number of "Map input records" when
> I rerun job ( same data) is not same.
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