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https://issues.apache.org/jira/browse/HBASE-14727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15009565#comment-15009565
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Andrew Purtell commented on HBASE-14727:
----------------------------------------
{code}
+ /**
+ * @return the cache hit ratio of latest N periods for the region.
+ */
+ public String getCacheHitRatioLatestNPeriods() {
+ return regionLoadPB.getCacheHitRatioLatestNPeriods();
+ }
{code}
and
{code}
+ /** the cache hit ratio of latest N peroids for the region */
+ optional string cache_hit_ratio_latest_N_periods = 25;
{code}
Do we need this? Operators can collect the caching metrics we periodically
export and trend this information however they like using their preferred
metrics store and tooling. Would remove a fair amount of new code from this
patch.
> Add block cache stats for regions
> ---------------------------------
>
> Key: HBASE-14727
> URL: https://issues.apache.org/jira/browse/HBASE-14727
> Project: HBase
> Issue Type: New Feature
> Reporter: Eungsop Yoo
> Priority: Minor
> Attachments: HBASE-14727-v1.patch, HBASE-14727-v2.patch,
> HBASE-14727.patch, rs-web-ui.png
>
>
> The stats of block cache are calculated at region server level only. So at
> region level, we could not know about the numbers of blocks cached, the sizes
> of cached blocks, the numbers of cache hit, etc. I suggest to add the stats
> of block cache at region level.
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