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HBase, mail # user - Inconsistent scan performance with caching set to 1


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RE: Inconsistent scan performance with caching set to 1
Ramkrishna.S.Vasudevan 2012-08-31, 04:15
Thanks Stack for giving a pointer to this.  Yes it does seems this property
is very important.

Regards
Ram

> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
> Stack
> Sent: Friday, August 31, 2012 3:55 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Inconsistent scan performance with caching set to 1
>
> On Thu, Aug 30, 2012 at 9:24 AM, Jay T <[EMAIL PROTECTED]> wrote:
> >  Thanks Stack for pointing us in the right direction. Indeed it was
> the
> > tcpNodeDelay setting. We set these to be true.
> >
> > ipc.server.tcpnodelay ==> true
> > hbase.ipc.client.tcpnodelay ==> true
> >
> > All reads that previously had the 40ms overhead are now between 2 and
> 3 ms
> > like we would expect them to be.
> >
> > Are these settings worthy of being put in the Hbase online book  ?
> >
>
> I added a note on nagles to the book at your suggestion.  We've toyed
> w/ making tcpnodelay true as default but as has been reasoned in the
> issue cited, it depends on cell sizes whether it effective or not.  We
> should give this config. a higher profile than it currently has it
> seems.
>
> St.Ack