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https://issues.apache.org/jira/browse/CASSANDRA-3569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14004866#comment-14004866
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Joshua McKenzie commented on CASSANDRA-3569:
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Using the iptables method to block traffic - the sending node is clearing out
all repair sessions as I'd expect so I'm not seeing the same thing you are on
that side. On the receiving side, however, it's just silently hanging on the
repair sessions even after . Even though we're futzing with iptables which is
pretty artificial, netstat shows the TCP connections have been severed which
should bubble up and remove those streams.
> Failure detector downs should not break streams
> -----------------------------------------------
>
> Key: CASSANDRA-3569
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3569
> Project: Cassandra
> Issue Type: New Feature
> Reporter: Peter Schuller
> Assignee: Joshua McKenzie
> Fix For: 2.1.1
>
> Attachments: 3569-2.0.txt, 3569_v1.txt
>
>
> 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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