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From Stack <st...@duboce.net>
Subject Re: Inconsistent scan performance with caching set to 1
Date Thu, 30 Aug 2012 22:24:55 GMT
On Thu, Aug 30, 2012 at 9:24 AM, Jay T <jay.pylons@gmail.com> 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


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