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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-3019) Add a metric to track number of slow fsyncs
Date Wed, 25 Apr 2018 08:38:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-3019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16451876#comment-16451876
] 

ASF GitHub Bot commented on ZOOKEEPER-3019:
-------------------------------------------

Github user nkalmar commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/501#discussion_r183980318
  
    --- Diff: src/java/test/org/apache/zookeeper/test/FourLetterWordsTest.java ---
    @@ -167,6 +167,8 @@ public void testValidateStatOutput() throws Exception {
             line = in.readLine();
             Assert.assertTrue(Pattern.matches("^Mode: .*$", line));
             line = in.readLine();
    +        Assert.assertTrue(Pattern.matches("^Fsync threshold exceeded: \\d+$", line));
    --- End diff --
    
    Yes, it would have been an ugly solution, that's why I didn't go ahead with it.
    Okay, sounds good to me, I will make the changes.
    
    Thanks!


> Add a metric to track number of slow fsyncs
> -------------------------------------------
>
>                 Key: ZOOKEEPER-3019
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3019
>             Project: ZooKeeper
>          Issue Type: Improvement
>          Components: jmx, server
>    Affects Versions: 3.5.3, 3.4.11, 3.6.0
>            Reporter: Norbert Kalmar
>            Assignee: Norbert Kalmar
>            Priority: Major
>             Fix For: 3.5.4, 3.6.0, 3.4.13
>
>
> Add jmx bean and Command to ZooKeeper server to expose the the number of slow fsyncs
as a metric.
> FileTxnLog.commit() should count the number of times fsync exceeds fsyncWarningThresholdMS.



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