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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 Thu, 12 Apr 2018 15:45:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-3019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16435806#comment-16435806
] 

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

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

    https://github.com/apache/zookeeper/pull/501#discussion_r181129644
  
    --- Diff: src/java/main/org/apache/zookeeper/server/ServerStats.java ---
    @@ -148,9 +150,23 @@ synchronized public void resetRequestCounters(){
             packetsReceived = 0;
             packetsSent = 0;
         }
    +
    +    public long getFsyncThresholdExceedCount() {
    +        return fsyncThresholdExceedCount;
    +    }
    +
    +    synchronized public void increaseFsyncThresholdExceedCount() {
    +        fsyncThresholdExceedCount++;
    +    }
    +
    +    synchronized void resetFsyncThresholdExceedCount() {
    --- End diff --
    
    It would be nice to expose this method via JMX too, imho.


> 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
>            Reporter: Norbert Kalmar
>            Assignee: Norbert Kalmar
>            Priority: Major
>
> 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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