[jira] [Comment Edited] (CASSANDRA-8969) Add indication in cassandra.yaml that rpc timeouts going too high will cause memory build up

["J.B. Langston (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-8969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15208691#comment-15208691 ] 

J.B. Langston edited comment on CASSANDRA-8969 at 3/23/16 4:19 PM:
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I agree this could be a good warning to have. I've seen a lot of users naively increase the timeout. Usually it's caused by I/O not keeping up with requests, but a lot of users won't take the time to figure that out. They just see their application timing out and they see something in cassandra.yaml called timeout so they increase it without thinking of the cost.  Now they have GC death spiral and OOM to contend with in addition to the original problem.


was (Author: jblangston@datastax.com):
I agree this could be a good warning to have. I've seen a lot of customers naively increase the timeout. Usually it's caused by I/O not keeping up with requests, but a lot of users won't take the time to figure that out. They just see their application timing out and they see something in cassandra.yaml called timeout so they increase it without thinking of the cost.  Now they have GC death spiral and OOM to contend with in addition to the original problem.

> 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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