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From Ted Yu <yuzhih...@gmail.com>
Subject Re: Hbase question
Date Sun, 21 Apr 2013 17:17:08 GMT
HBase relies on hdfs features heavily.
HBase also  supports running Map Reduce Jobs.

You can find examples in these places (0.94 codebase):

./security/src/test/java/org/apache/hadoop/hbase/mapreduce
./src/examples/mapreduce/org/apache/hadoop/hbase/mapreduce
./src/main/java/org/apache/hadoop/hbase/mapreduce
./src/main/resources/org/apache/hadoop/hbase/mapreduce
./src/test/java/org/apache/hadoop/hbase/mapreduce

On Sun, Apr 21, 2013 at 12:53 AM, Rami Mankevich <ramim@amdocs.com> wrote:

> I have additional question:
> Hbase is built on top of hadoop.
> Does HBases uses HDFS only of hadoop or uses Map Reduce Jobs engine as
> well?
> Thanks a lot!
>
>
> From: Rami Mankevich
> Sent: Tuesday, April 09, 2013 8:52 PM
> To: 'user@hbase.apache.org'
> Cc: 'Andrew Purtell'
> Subject: RE: Hbase question
>
> First of all - thanks  for the quick response.
>
> Basically threads I want to open are for my own  internal structure
> updates and I guess have no relations to HBase internal structures.
> All I want is initiations for some asynchronous structure updates as part
> of coprocessor execution in order  not to block user reponse.
>
> The only reason I was asking is to be sure Hbase will not kill those
> threads.
> As I understand - shouldn't be any issue with that. Am I correct?
>
> In addition - Is there any Hbase Thread pool I can use?
>
>
> Thanks
> From: Andrew Purtell [mailto:apurtell@apache.org]<mailto:[mailto:
> apurtell@apache.org]>
> Sent: Tuesday, April 09, 2013 6:53 PM
> To: Rami Mankevich
> Cc: apurtell@apache.org<mailto:apurtell@apache.org>
> Subject: Re: Hbase question
>
> Hi Rami,
>
> It is no problem to create threads in a coprocessor as a generic answer.
> More specifically there could be issues depending on exactly what you want
> to do, since coprocessor code changes HBase internals. Perhaps you could
> say a bit more. I also encourage you to ask this question on
> user@hbase.apache.org<mailto:user@hbase.apache.org> so other contributors
> can chime in too.
>
> On Tuesday, April 9, 2013, Rami Mankevich wrote:
> Hey
> According to the Hbase documentation you are one of contrinuters to the
> HBase project
> I would like to raise some question when nobody can basically advice me:
>
> In context of coprocessors I want to raise some threads.
> Do you see any problems with that?
>
> Thanks
> This message and the information contained herein is proprietary and
> confidential and subject to the Amdocs policy statement, you may review at
> http://www.amdocs.com/email_disclaimer.asp
>
>
> --
> Best regards,
>
>    - Andy
>
> Problems worthy of attack prove their worth by hitting back. - Piet Hein
> (via Tom White)
>

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