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From Trung Tran <>
Subject Cassandra/Hadoop only write few columns
Date Tue, 18 Jan 2011 08:40:10 GMT

I'm working on ColumnFamilyOutputFormat and for some reasons my reduce
class does not write all columns to cassandra. I tried to modify
mapreduce.output.columnfamilyoutputformat.batch.threshold with some
different values (1, 8, .. etc) but no thing changes.

What i'm having in my reduce class is :

ArrayList<Mutation> a = new ArrayList<Mutation>();

a.add(getMutation(colNam1, val1));
a.add(getMutation(colNam2, val2));
a.add(getMutation(colNam2, val2)); ...etc


Only 2 columns are written in to cassandra, and no error log is found
on both hadoop and cassandra log. Any help is appreciated.


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