[ZOOKEEPER-3019] Add a metric to track number of slow fsyncs

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.5.3, 3.4.11, 3.6.0
• Fix Version/s: 3.6.0, 3.4.13, 3.5.5
• Component/s: jmx, server
• Labels: pull-request-available
• Assignee: Norbert Kalmár
• Reporter: Norbert Kalmár
• Created: 06/Apr/18 11:26
• Updated: 17/Jul/18 04:49
• Resolved: 08/Jun/18 14:54

Description

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.

Issue Links

• links to: GitHub Pull Request #501
• links to: GitHub Pull Request #510