>   raise EOFError()
> EOFError

[snip]

> error: [Errno 104] Connection reset by peer

Sounds like you either have a firewalling/networking issues that is
tearing down TCP connections, or your cassandra node is dying. Have
you checked the Cassandra system log? A frequent mistake is
configuring memtables thresholds far too aggressively for your heap
size, resulting in an out-of-memory error which, given Cassandra's
default JVM options, results in the node dying.

Bottom line: Check /var/log/cassandra/system.log to begin with and see
if it's reporting anything or being restarted.

-- 
/ Peter Schuller

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