[jira] [Created] (ZOOKEEPER-3019) Add a metric to track number of slow fsyncs

[Norbert Kalmar (JIRA)]

Norbert Kalmar created ZOOKEEPER-3019:
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             Summary: 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: 3.4.11, 3.5.3
            Reporter: Norbert Kalmar


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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