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Posted to issues@hbase.apache.org by "Anoop Sam John (JIRA)" <ji...@apache.org> on 2016/07/12 04:44:11 UTC
[jira] [Comment Edited] (HBASE-15643) Need metrics of cache hit
ratio, etc for one table
[ https://issues.apache.org/jira/browse/HBASE-15643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15372168#comment-15372168 ]
Anoop Sam John edited comment on HBASE-15643 at 7/12/16 4:43 AM:
-----------------------------------------------------------------
LruBlockCache
{code}
stats.incrementBlockCountForTable(cacheKey.getTableName());
366 stats.incrementBlockSizeForTable(cacheKey.getTableName(), cb.heapSize());
{code}
L1/L2 cache look up and read is in hot path and there adding code like above which involve a Map lookup operation will be perf hit. That is what the comment means. Agree with it. We should be careful abt doing this.
was (Author: anoop.hbase):
LruBlockCache
{code}
stats.incrementBlockCountForTable(cacheKey.getTableName());
366 stats.incrementBlockSizeForTable(cacheKey.getTableName(), cb.heapSize());
{code}
L1/L2 cache look up and read is in hot path and there adding code like above which involve a Map lookup operation will be perf hit. That is what the comment means.
> 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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