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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8969) Add indication in cassandra.yaml that rpc timeouts going too high will cause memory build up
Date Wed, 23 Mar 2016 15:36:25 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15208605#comment-15208605
] 

Sylvain Lebresne commented on CASSANDRA-8969:
---------------------------------------------

bq. you could potentially have 2x in-flight requests being kept in memory

Not totally sure I follow. Are we talking about the request objects? Because those are really
tiny and I don't that being that relevant. Besides, the number of max in-flight queries is
currently really limited by the number of native transport threads, and I'm not sure to see
in which way a bigger rpc timeouts changes much here.

Anyway, feel free to check the attached patch to see if we're talking of the same thing with
different words. But if we aren't, I'm not sure to understand the problem you're mentioning.

> Add indication in cassandra.yaml that rpc timeouts going too high will cause memory build
up
> --------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-8969
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8969
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Configuration
>            Reporter: Jeremy Hanna
>            Assignee: Jeremy Hanna
>            Priority: Minor
>              Labels: lhf
>             Fix For: 3.x
>
>         Attachments: 8969.txt
>
>
> It would be helpful to communicate that setting the rpc timeouts too high may cause memory
problems on the server as it can become overloaded and has to retain the in flight requests
in memory.  I'll get this done but just adding the ticket as a placeholder for memory.



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