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From "Heng Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15377) Per-RS Get metric is time based, per-region metric is size-based
Date Wed, 02 Mar 2016 07:44:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15175211#comment-15175211
] 

Heng Chen commented on HBASE-15377:
-----------------------------------

Oh, sorry, just see it now.  HBASE-15376 contains changes of this issue...

> 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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