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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2015/05/12 21:35:59 UTC

[jira] [Commented] (CASSANDRA-9364) Add a warning when a high setting for rpc_max_threads is specified for HSHA

    [ https://issues.apache.org/jira/browse/CASSANDRA-9364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14540562#comment-14540562 ] 

Jonathan Ellis commented on CASSANDRA-9364:
-------------------------------------------

+1 (do you want to suggest the more reasonable limit in the warning?)

> Add a warning when a high setting for rpc_max_threads is specified for HSHA
> ---------------------------------------------------------------------------
>
>                 Key: CASSANDRA-9364
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9364
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Brandon Williams
>            Assignee: Brandon Williams
>             Fix For: 2.0.15, 2.1.x
>
>         Attachments: 9364.txt
>
>
> In CASSANDRA-7594 we allowed configuring this.  The problem is this was ignored for HSHA previously, so some people go through this scenario:
> 1. start with sync and 4000 threads
> 2. switch to HSHA, pre-7594
> 3. upgrade to a version after 7594, without changing this setting
> 4. experience awful performance due to insane thread contention



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