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From Anoop Sam John <anoo...@huawei.com>
Subject RE: Using HBase for Deduping
Date Fri, 15 Feb 2013 04:19:20 GMT
When max versions set as 1 and duplicate key is added, the last added will win removing the
old.  This is what you want Rahul?  I think from his explanation he needs the reverse way

From: Asaf Mesika [asaf.mesika@gmail.com]
Sent: Friday, February 15, 2013 3:56 AM
To: user@hbase.apache.org; Rahul Ravindran
Subject: Re: Using HBase for Deduping

You can load the events into an Hbase table, which has the event id as the
unique row key. You can define max versions of 1 to the column family thus
letting Hbase get rid of the duplicates for you during major compaction.

On Thursday, February 14, 2013, Rahul Ravindran wrote:

> Hi,
>    We have events which are delivered into our HDFS cluster which may be
> duplicated. Each event has a UUID and we were hoping to leverage HBase to
> dedupe them. We run a MapReduce job which would perform a lookup for each
> UUID on HBase and then emit the event only if the UUID was absent and would
> also insert into the HBase table(This is simplistic, I am missing out
> details to make this more resilient to failures). My concern is that doing
> a Read+Write for every event in MR would be slow (We expect around 1
> Billion events every hour). Does anyone use Hbase for a similar use case or
> is there a different approach to achieving the same end result. Any
> information, comments would be great.
> Thanks,
> ~Rahul.
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