Thanks for your reply Mahadev -

I wonder if you can elaborate on how you get to your observation of most
applications that use ZooKeeper needing JVM heap size > 64M. Our platform
uses ZooKeeper to manager cluster of hundreds of nodes with -Xmx32m. The
only time I observed OutOfMemory issue is when my application goes into
endless loop injecting messaging into a ZooKeeper queue.

Allowing ZooKeeper server to take up 3G out of 4G physical memory seems
excessive, imprudent.

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