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From "Peter Schuller (Created) (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-3569) Failure detector downs should not break streams
Date Sun, 04 Dec 2011 00:56:40 GMT
Failure detector downs should not break streams

                 Key: CASSANDRA-3569
             Project: Cassandra
          Issue Type: Bug
            Reporter: Peter Schuller
            Assignee: Peter Schuller

CASSANDRA-2433 introduced this behavior just to get repairs to don't sit there waiting forever.
In my opinion the correct fix to that problem is to use TCP keep alive. Unfortunately the
TCP keep alive period is insanely high by default on a modern Linux, so just doing that is
not entirely good either.

But using the failure detector seems non-sensicle to me. We have a communication method which
is the TCP transport, that we know is used for long-running processes that you don't want
to incorrectly be killed for no good reason, and we are using a failure detector tuned to
detecting when not to send real-time sensitive request to nodes in order to actively kill
a working connection.

So, rather than add complexity with protocol based ping/pongs and such, I propose that we
simply just use TCP keep alive for streaming connections and instruct operators of production
clusters to tweak net.ipv4.tcp_keepalive_{probes,intvl} as appropriate (or whatever equivalent
on their OS).

I can submit the patch. Awaiting opinions.

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