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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15643) Need metrics of cache hit ratio, etc for one table
Date Tue, 12 Jul 2016 16:02:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15373133#comment-15373133
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Elliott Clark commented on HBASE-15643:
---------------------------------------

incrementHitForTable does 
{code}
MetricsTableCacheValues val = tableCacheMetricsMap.get(tableName);
{code}

incrementHitForTable/incrementMissForTable is called on every block read.

> Need metrics of cache hit ratio, etc for one table
> --------------------------------------------------
>
>                 Key: HBASE-15643
>                 URL: https://issues.apache.org/jira/browse/HBASE-15643
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Heng Chen
>            Assignee: Alicia Ying Shu
>         Attachments: HBASE-15643.patch
>
>
> There are many tables on our cluster,  only some of them need to be read online.  
> We could improve the performance of read by cache,  but we need some metrics for it at
table level. There are a few we can collect: BlockCacheCount, BlockCacheSize, BlockCacheHitCount,
BlockCacheMissCount, BlockCacheHitPercent



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