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https://issues.apache.org/jira/browse/HBASE-20571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16477319#comment-16477319
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Balazs Meszaros commented on HBASE-20571:
-----------------------------------------
I uploaded a more general solution, where JSONBean class serializes special
floating point values as "NaN", "Infinity" or "-Infinity".
[~apurtell] yes, it also affects branch-1, patch is there.
> JMXJsonServlet generates invalid JSON if it has NaN in metrics
> --------------------------------------------------------------
>
> Key: HBASE-20571
> URL: https://issues.apache.org/jira/browse/HBASE-20571
> Project: HBase
> Issue Type: Bug
> Components: UI
> Reporter: Balazs Meszaros
> Assignee: Balazs Meszaros
> Priority: Major
> Fix For: 3.0.0, 2.0.1, 1.4.5
>
> Attachments: HBASE-20571.branch-1.003.patch,
> HBASE-20571.branch-2.0.001.patch, HBASE-20571.branch-2.0.002.patch,
> HBASE-20571.branch-2.0.002.patch, HBASE-20571.branch-2.0.003.patch
>
>
> {{/jmx}} servlet responses invalid JSON, if some metrics are NaN:
> {code}
> "l1CacheHitCount" : 0,
> "l1CacheMissCount" : 0,
> "l1CacheHitRatio" : NaN,
> "l1CacheMissRatio" : NaN,
> "l2CacheHitCount" : 0,
> "l2CacheMissCount" : 0,
> "l2CacheHitRatio" : 0.0,
> "l2CacheMissRatio" : 0.0,
> {code}
> NaN is an invalid character sequence in JSON. We should not response NaN in
> metrics.
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