http://www.datastax.com/support-forums/topic/increment-countercolumn-with-hadoop-job Software, Support, and Training for Apache Cassandra en-US Fri, 24 May 2013 10:40:50 +0000 http://bbpress.org/?v=1.0.3 q http://www.datastax.com/support-forums/search.php http://www.datastax.com/support-forums/topic/increment-countercolumn-with-hadoop-job#post-7000 Thu, 18 Oct 2012 07:45:12 +0000 JoelT 7000@http://www.datastax.com/support-forums/ <p>Ok thanks, I agree it is not the good way to do it, with retries and tasks failing it will lead to wrong results. I will compute the whole value before sending it to Cassandra.</p> <p>Thanks again for the answers </p> http://www.datastax.com/support-forums/topic/increment-countercolumn-with-hadoop-job#post-6995 Wed, 17 Oct 2012 21:33:33 +0000 alexliu 6995@http://www.datastax.com/support-forums/ <p>you can switch to ColumnFamilyRecordWriter to create mutation on counter column </p> http://www.datastax.com/support-forums/topic/increment-countercolumn-with-hadoop-job#post-6994 Wed, 17 Oct 2012 21:21:01 +0000 jeromatron 6994@http://www.datastax.com/support-forums/ <p>Incrementing counters with Hadoop is probably not a good idea. Hadoop does retries and speculative execution and with counters that would create a mess. If you absolutely must do that, you can just create the raw mutations with thrift in your code, but again, it's probably not a good idea. </p> http://www.datastax.com/support-forums/topic/increment-countercolumn-with-hadoop-job#post-6991 Wed, 17 Oct 2012 17:29:54 +0000 JoelT 6991@http://www.datastax.com/support-forums/ <p>Hi all,</p> <p>I'm trying to write data to cassandra from a hadoop job. I am wondering if it is possible to increment a column with CounterColumnType as default_validation_class using BulkOutputFormat. Maybe I am missing something but it looks like the write method in BulkRecordWriter only leads to addColumn methods.</p> <p>Thanks for any help on this one! </p>