[jira] [Created] (HBASE-15377) Per-RS Get metric is time based, per-region metric is size-based

["Enis Soztutar (JIRA)" <ji...@apache.org>]

Enis Soztutar created HBASE-15377:
-------------------------------------

             Summary: Per-RS Get metric is time based, per-region metric is size-based
                 Key: HBASE-15377
                 URL: https://issues.apache.org/jira/browse/HBASE-15377
             Project: HBase
          Issue Type: Sub-task
            Reporter: Enis Soztutar


We have metrics for Get operations at the region server level and region level. 

{code}
   "Get_num_ops" : 4837505,
    "Get_min" : 0,
    "Get_max" : 296,
    "Get_mean" : 0.2934618155433431,
    "Get_median" : 0.0,
    "Get_75th_percentile" : 0.0,
    "Get_95th_percentile" : 1.0,
    "Get_99th_percentile" : 1.0,
{code}

and 
{code}
   "Namespace_hbase_table_meta_region_1588230740_metric_get_num_ops" : 103,
    "Namespace_hbase_table_meta_region_1588230740_metric_get_min" : 450,
    "Namespace_hbase_table_meta_region_1588230740_metric_get_max" : 470,
    "Namespace_hbase_table_meta_region_1588230740_metric_get_mean" : 450.19417475728153,
    "Namespace_hbase_table_meta_region_1588230740_metric_get_median" : 460.0,
    "Namespace_hbase_table_meta_region_1588230740_metric_get_75th_percentile" : 470.0,
    "Namespace_hbase_table_meta_region_1588230740_metric_get_95th_percentile" : 470.0,
    "Namespace_hbase_table_meta_region_1588230740_metric_get_99th_percentile" : 470.0,
{code}

The problem is that the report values for the region server shows the latency, versus the reported values for the region shows the response sizes. There is no way of telling this without reading the source code. 

I think we should deprecate response size histograms in favor of latency histograms. 

See also HBASE-15376. 



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