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HBase, mail # dev - Smarter Region assignment policy?


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Re: Smarter Region assignment policy?
Elliott Clark 2013-07-22, 19:12
I filed https://issues.apache.org/jira/browse/HBASE-6143 a while ago.

Basically there are three methods on the balancer.  One that does a
real and true balance.  There are two others that are used for quick
assignment.  Those two don't take into account all of the balancing
rules and locality info.  We should really consolidate everything into
one method that has some idea of time given.

The preferred nodes stuff is good but it's really breaking the
contract of what the method names say they will do.  So we should just
make everything named well and use the same code path.  I'm currently
off on tracing (spoilers it's awesome) right now but I plan to help
finish of the polishing of the balancer shortly.

On Mon, Jul 22, 2013 at 11:55 AM, lars hofhansl <[EMAIL PROTECTED]> wrote:
> I faintly remember there was a jira that attempted to assign the regions to the same region servers after a restart based on existing .META. information (if possible).
> Will try to find that and see why it is not working as expected.
>
>
> -- Lars
>
>
>
> ________________________________
>  From: Vladimir Rodionov <[EMAIL PROTECTED]>
> To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
> Sent: Monday, July 22, 2013 11:43 AM
> Subject: RE: Smarter Region assignment policy?
>
>
> Yes, its related but not what I am looking for.
>
> Locality index is approaching to 100% after major compaction of all tables. Its often > 90% during regular operation of a cluster,
> but is far below 50% when cluster restarts. Can assignment manager take into account previous region assignments on
> node/cluster start up? That is what I am looking for. How hard is to implement this feature?
>
> Best regards,
> Vladimir Rodionov
> Principal Platform Engineer
> Carrier IQ, www.carrieriq.com
> e-mail: [EMAIL PROTECTED]
>
> ________________________________________
> From: Ted Yu [[EMAIL PROTECTED]]
> Sent: Monday, July 22, 2013 11:06 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Smarter Region assignment policy?
>
> Please take a look at https://issues.apache.org/jira/browse/HBASE-4755
>
> On Mon, Jul 22, 2013 at 10:56 AM, Vladimir Rodionov <[EMAIL PROTECTED]
>> wrote:
>
>> It seems that current (0.94.6) region assignment on start up policy is not
>> that smart and does not utilize hdfs block locality
>> Are there any open HBase JIRA ticket(s) that addresses the issue?
>>
>> Best regards,
>> Vladimir Rodionov
>> Principal Platform Engineer
>> Carrier IQ, www.carrieriq.com
>> e-mail: [EMAIL PROTECTED]
>>
>>
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>
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