[HBASE-20571] JMXJsonServlet generates invalid JSON if it has NaN in metrics

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha-1, 2.1.0, 1.3.3, 2.0.1, 1.4.5
• Component/s: UI
• Hadoop Flags: Reviewed
• Assignee: Balazs Meszaros
• Reporter: Balazs Meszaros
• Created: 11/May/18 14:30
• Updated: 24/Jun/22 17:55
• Resolved: 16/May/18 19:20

Description

/jmx servlet responses invalid JSON, if some metrics are NaN:

    "l1CacheHitCount" : 0,
    "l1CacheMissCount" : 0,
    "l1CacheHitRatio" : NaN,
    "l1CacheMissRatio" : NaN,
    "l2CacheHitCount" : 0,
    "l2CacheMissCount" : 0,
    "l2CacheHitRatio" : 0.0,
    "l2CacheMissRatio" : 0.0,

NaN is an invalid character sequence in JSON. We should not response NaN in metrics.

Issue Links

• is required by: HBASE-24657 JsonBean representation of metrics at /jmx endpoint now quotes all numbers
• links to: Review Board (branch-2.0)