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From Mike Keane <mke...@conversantmedia.com>
Subject RE: Deal with duplicates in Flume with a crash.
Date Wed, 03 Dec 2014 22:35:50 GMT
We effectively mitigated this problem by using the UUID interceptor and customizing the HDFS
Sink to do a check and put of the UUID to HBase.  In the customized sink we check HBase to
see if we have seen the UUID before, if we have it is a duplicate and we log a new duplicate
metric with the existing sink metrics and throw the event away.  If we have not seen the UUID
before we write the Event to HDFS and do a put of the UUID to hbase.

Because of our volume to minimize the number of check/puts to HBase we put multiple logs in
a single FlumeEvent. 


From: Guillermo Ortiz [konstt2000@gmail.com]
Sent: Wednesday, December 03, 2014 4:15 PM
To: user@flume.apache.org
Subject: Re: Deal with duplicates in Flume with a crash.

I didn't know anything about a Hive Sink, I'll check the JIRA about it, thanks.
The pipeline is Flume-Kafka-SparkStreaming-XXX

So I guess I should deal in SparkStreaming with it, right? I guess
that it would be easy to do it with an UUID interceptor or is there
another way easier?

2014-12-03 22:56 GMT+01:00 Roshan Naik <roshan@hortonworks.com>:
> Using the UUID interceptor at the source closest to data origination.. it
> will help identify duplicate events after they are delivered.
> If it satisfies your use case, the upcoming Hive Sink will mitigate the
> problem a little bit (since it uses transactions to write to destination).
> -roshan
> On Wed, Dec 3, 2014 at 8:44 AM, Joey Echeverria <joey@cloudera.com> wrote:
>> There's nothing built into Flume to deal with duplicates, it only
>> provides at-least-once delivery semantics.
>> You'll have to handle it in your data processing applications or add
>> an ETL step to deal with duplicates before making data available for
>> other queries.
>> -Joey
>> On Wed, Dec 3, 2014 at 5:46 AM, Guillermo Ortiz <konstt2000@gmail.com>
>> wrote:
>> > Hi,
>> >
>> > I would like to know if there's a easy way to deal with data
>> > duplication when an agent crashs and it resends same data again.
>> >
>> > Is there any mechanism to deal with it in Flume,
>> --
>> Joey Echeverria
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