[jira] [Updated] (HBASE-22459) Expose store reader reference count

["Pankaj Kumar (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-22459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pankaj Kumar updated HBASE-22459:
---------------------------------
    Fix Version/s:     (was: 1.5.0)

> Expose store reader reference count
> -----------------------------------
>
>                 Key: HBASE-22459
>                 URL: https://issues.apache.org/jira/browse/HBASE-22459
>             Project: HBase
>          Issue Type: Improvement
>          Components: HFile, metrics, regionserver
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>            Priority: Minor
>             Fix For: 3.0.0, 2.3.0
>
>         Attachments: HBASE-22459-branch-1.patch, HBASE-22459-branch-1.patch, HBASE-22459-branch-1.patch, HBASE-22459-branch-2.patch, HBASE-22459-branch-2.patch, HBASE-22459-branch-2.patch, HBASE-22459.patch, HBASE-22459.patch, HBASE-22459.patch
>
>
> Expose the reference count over a region's store file readers as a metric in region metrics and also as a new field in RegionLoad. This will make visible the reader reference count over all stores in the region to both metrics capture and anything that consumes ClusterStatus, like the shell's status command and the master UI.
> Coprocessors that wrap scanners might leak them, which will leak readers. We log when this happens but in order to notice the increasing trend of reference counts you have to scrape log output. It would be better if this information is also available as a metric.



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