Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Plain View
HBase, mail # user - Coprocessor / threading model


+
Adrien Mogenet 2013-01-13, 00:06
+
Andrew Purtell 2013-01-13, 02:39
+
Ted Yu 2013-01-13, 02:48
+
Andrew Purtell 2013-01-13, 03:58
+
ramkrishna vasudevan 2013-01-13, 10:04
+
Adrien Mogenet 2013-01-13, 10:42
+
Anoop John 2013-01-13, 16:12
+
Wei Tan 2013-01-15, 18:44
+
Varun Sharma 2013-01-15, 18:56
+
Andrew Purtell 2013-01-15, 19:20
+
Wei Tan 2013-01-15, 22:41
+
Anoop Sam John 2013-01-16, 04:39
+
Ted 2013-01-13, 01:38
Copy link to this message
-
Re: Coprocessor / threading model
anil gupta 2013-01-13, 02:30
I also ran into similar problem with one of my secondary index
implementation. But, i could not dig into the problem as i have to shift
focus on some other stuff. I am also interested in knowing the resolution
of this kind of problem in Coprocessors.

On Sat, Jan 12, 2013 at 5:38 PM, Ted <[EMAIL PROTECTED]> wrote:

> 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 <[EMAIL PROTECTED]>
> 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
>

--
Thanks & Regards,
Anil Gupta
+
Michel Segel 2013-01-13, 13:25