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From Ted <yuzhih...@gmail.com>
Subject Re: Coprocessor / threading model
Date Sun, 13 Jan 2013 01:38:56 GMT
Please take a look at hbase-6651 which improves thread safety of table pool. 

Are you using hbase 0.94 ?

Thanks

On Jan 12, 2013, at 4:06 PM, Adrien Mogenet <adrien.mogenet@gmail.com> wrote:

> Hi there,
> 
> I'm experiencing some issues with CP. I'm trying to implement an indexing
> solution (inspired by Annop's slides). In pre-put, I trigger another Put()
> in an external table (to build the secondary index). It works perfect for
> one client, but when I'm inserting data from 2 separate clients, I met
> issues with HTable object (the one used in pre-Put()), because it's not
> thread-safe. I decided to move on TablePool and that fixed my issue.
> 
> But if I increase the write-load (and concurrency) HBase is throwing a OOM
> exception because it can't create new native threads. Looking at HBase
> metrics "threads count", I see that roughly 3500 threads are created.
> 
> I'm looking for documentation about how CPs are working with threads :
> what/when should I protect against concurrency issues ? How may I solve my
> issue ?
> 
> Help is welcome :-)
> 
> -- 
> Adrien Mogenet
> 06.59.16.64.22
> http://www.mogenet.me

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