[HBASE-10755] MetricsRegionSourceImpl creates metrics that start with a lower case

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.96.0
• Fix Version/s: 0.99.0
• Hadoop Flags: Incompatible change, Reviewed
• Release Note: There used to be a mix of metrics starting with "namespace_" "and Namespace_", now all the metrics will use the latter.
• Assignee: Jean-Daniel Cryans
• Reporter: Jean-Daniel Cryans
• Created: 14/Mar/14 22:23
• Updated: 21/Feb/15 23:33
• Resolved: 17/Mar/14 22:40

Description

Noticed something while looking at MBeans; some metric names are capitalized while others aren't. This has the unwanted property of changing the metric names sorting. For example:

Namespace_default_table_t_region_0122d54a90c9dc191857daf11e8a047d_metric_scanNext_num_ops
namespace_default_table_t_region_0122d54a90c9dc191857daf11e8a047d_metric_appendCount

The reason for this is that MutableHistogram uses StringUtils.capitalize() on the metrics name (as create by MetricsRegionSourceImpl with "namespace_").

I'm not sure what the intent was with capitalization, but either way it's a simple fix. eclark?