tu nguyen khac created CASSANDRA-5085:
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Summary: 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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