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From "Peter Schuller (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3569) Failure detector downs should not break streams
Date Sun, 05 Feb 2012 01:24:54 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13200618#comment-13200618
] 

Peter Schuller commented on CASSANDRA-3569:
-------------------------------------------

Better description of why I believe TCP keep-alive to be the "correct" choice (unless we change
the protocol): https://issues.apache.org/jira/browse/CASSANDRA-3838?focusedCommentId=13200617&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13200617

                
> Failure detector downs should not break streams
> -----------------------------------------------
>
>                 Key: CASSANDRA-3569
>                 URL: https://issues.apache.org/jira/browse/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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