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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2817) Expose number of threads blocked on submitting a memtable for flush
Date Thu, 23 Jun 2011 17:03:47 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13053970#comment-13053970
] 

Jonathan Ellis commented on CASSANDRA-2817:
-------------------------------------------

+1

> Expose number of threads blocked on submitting a memtable for flush
> -------------------------------------------------------------------
>
>                 Key: CASSANDRA-2817
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2817
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.7.0
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>             Fix For: 0.7.7
>
>         Attachments: 0001-Expose-threads-blocked-on-submission-to-executor-v2.patch,
0001-Expose-threads-blocked-on-submission-to-executor.patch
>
>
> Writes can be blocked by a thread trying to submit a memtable while the flush queue is
full. While this is the expected behavior (the goal being to prevent OOMing), it is worth
exposing when that happens so that people can monitor it and modify settings accordingly if
that happens too often.

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