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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15162) Add separate metrics for meta/data block hit ratio in cache
Date Tue, 26 Jan 2016 05:05:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15116695#comment-15116695
] 

Yu Li commented on HBASE-15162:
-------------------------------

Thanks for mentioning HBASE-14983, checking the changes there I could see a more fine-grained
separation on the cache count metrics (great work sir), but I didn't see  any hit ratio. It
seems you prefer counter to gauge and plan to do the aggregation at front-end? Since we already
have a gauge for blockCacheHitPercent, I think it would be more convenient to supply a gauge
for meta/dataBlockCacheHitPercent, so user could directly monitor on it rather than do additional
aggregation.

It's ok for me to merge HBASE-14983 and this JIRA, but I hope we could keep the hit ratio
gauge and the metrics name proposed here, so we won't need to modify our monitoring system
in the next upgrade in the future.

> 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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