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.


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