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From Ariel Rabkin <asrab...@gmail.com>
Subject Re: Seeing duplicate entries
Date Fri, 22 Oct 2010 16:03:51 GMT
On Fri, Oct 22, 2010 at 8:48 AM, Eric Yang <eric818@gmail.com> wrote:
> Hi Matt,


>
> The duplication filtering in Chukwa 0.3.0 depends on data loading to
> mysql.  The same primary key will update to the same row to remove
> duplicates.  It is possible to build a duplication detection process
> prior to demux which filter data based on sequence id + data type +
> csource (host), but this hasn't been implemented because primary key
> update method works well for my use case.

This isn't quite right. There is support in 0.3 and later versions for
doing de-duplication at the collector, in the manner Eric describes.
It works as a filter in the writer pipeline.

You need the following in your configuration:

<property>
  <name>chukwaCollector.writerClass</name>
  <value>org.apache.hadoop.chukwa.datacollection.writer.PipelineStageWriter</value>
</property>

<property>
  <name>chukwaCollector.pipeline</name>
<value>org.apache.hadoop.chukwa.datacollection.writer.Dedup,org.apache.hadoop.chukwa.datacollection.writer.SeqFileWriter</value>
</property>
	  	

See http://incubator.apache.org/chukwa/docs/r0.3.0/collector.html for background


--Ari

-- 
Ari Rabkin asrabkin@gmail.com
UC Berkeley Computer Science Department

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