Also, I should mention that some of the errors Andrew was seeing are related

I see this kind of stuff:

2009-04-07 17:58:13,344 - WARN  [NIOServerCxn.Factory:2181:
nioserverc...@417] - Exception
causing close of session 0x2208296c38e0000 due to Read error

and bye bye HRS ephemeral znodes, which triggers
(currently) HBASE-1314.

This I think is ZOOKEEPER-344

  - Andy

On Wed, Apr 8, 2009 at 12:39 PM, Nitay <> wrote:

> Hey guys,
> We've recently replaced a few pieces of HBase's cluster management and
> coordination with ZooKeeper. One of guys, Andrew Purtell, has a cluster that
> he throws a lot of load at. Andrew's cluster was getting a lot of
> SessionExpired events which were causing some havoc. After some discussion
> on the hbase list and additional testing by Andrew (tweaking things like the
> session timeout, quorum size, and GC used), we suspect the problem is that
> the Java GC is starving the ZooKeeper hearbeat thread from executing.
> There is a JIRA open on the matter where Joey suggests a solution that has
> worked for him:
> We wanted to loop you guys in to see if you have any thoughts/suggestions
> on the matter.
> Thanks,
> -n

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