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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15162) Add separate metrics for meta/data block hit ratio in cache
Date Mon, 25 Jan 2016 16:58:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15115542#comment-15115542
] 

stack commented on HBASE-15162:
-------------------------------

Oh, is this dependent on HBASE-15161? There is no patch attached to HBASE-15161.

> Add separate metrics for meta/data block hit ratio in cache
> -----------------------------------------------------------
>
>                 Key: HBASE-15162
>                 URL: https://issues.apache.org/jira/browse/HBASE-15162
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Yu Li
>            Assignee: Yu Li
>         Attachments: HBASE-15162.patch, HBASE-15162_v2.patch
>
>
> Currently we already have a metrics in name of {{blockCacheExpressHitPercent}} to indicate
the cache hit ratio. However, since meta block is small and often cached in memory with a
high hit ratio, this "mixed" metrics could not show the real data block hit ratio which is
more concerned.
> We propose to add two new metrics to show meta and data block cache hit ratio separately,
while reserving the old metrics for backward compatibility.



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