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From Peter Haggerty <>
Subject 2.0.10 to 2.0.11 upgrade and immediate ParNew and CMS GC storm
Date Wed, 29 Oct 2014 00:08:12 GMT
On a 3 node test cluster we recently upgraded one node from 2.0.10 to
2.0.11. This is a cluster that had been happily running 2.0.10 for
weeks and that has very little load and very capable hardware. The
upgrade was just your typical package upgrade:

$ dpkg -s cassandra | egrep '^Ver|^Main'
Maintainer: Eric Evans <>
Version: 2.0.11

Immediately after started it ran a couple of ParNews and then started
executing CMS runs. In 10 minutes the node had become unreachable and
was marked as down by the two other nodes in the ring, which are still

We have jstack output and the server logs but nothing seems to be
jumping out. Has anyone else run into this? What should we be looking


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