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From "Biju Nair (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18652) Expose individual cache stats in a CombinedCache through JMX
Date Tue, 12 Sep 2017 17:44:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16163345#comment-16163345

Biju Nair commented on HBASE-18652:

Thanks @stack for the review.

bq. how often are we calling the getL1? Everytime we want to update counters or just at startup?

Only on startup. BTW in {{master}} this is already defined {{synchronized}}

bq. Would subtracting L1 hits from global hits work for L2 hit count?

>From the UI we can get a point in time values. By exposing these already available cache
stats through JMX helps users understand the usage pattern by storing them.

> Expose individual cache stats in a CombinedCache through JMX
> ------------------------------------------------------------
>                 Key: HBASE-18652
>                 URL: https://issues.apache.org/jira/browse/HBASE-18652
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Biju Nair
>            Assignee: Biju Nair
>             Fix For: 1.4.0, 1.5.0, 2.0.0-alpha-3
>         Attachments: 18652-branch-1-V3.0.PATCH, HBASE-18652-addendum.patch, HBASE-18652-BRANCH-1.PATCH,
HBASE-18652-branch-1-v1.0.patch, HBASE-18652-branch-1-V2.0.PATCH, HBASE-18652-branch-1-V3.0.PATCH,
> With offHeap cache being used to store data blocks and on-heap for index and bloom filters,
exposing the stats from the individual caches through JMX will help understand the cache usage
trend. Currently the combined cache stats is available through JMX which may not provide insight
into the individual cache usage.

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