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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4018) Attach memcached as secondary block cache to regionserver
Date Wed, 22 Jun 2011 20:20:47 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13053446#comment-13053446
] 

Jonathan Gray commented on HBASE-4018:
--------------------------------------

The perf gain over the FS caching would be less-so if using short-circuited local reads. 
But anything that bypasses the DataNode is great for random read perf.

Even still, making a copy out of in-process memory should be faster than linux fs caching.

> Attach memcached as secondary block cache to regionserver
> ---------------------------------------------------------
>
>                 Key: HBASE-4018
>                 URL: https://issues.apache.org/jira/browse/HBASE-4018
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Li Pi
>            Assignee: Li Pi
>
> Currently, block caches are limited by heap size, which is limited by garbage collection
times in Java.
> We can get around this by using memcached w/JNI as a secondary block cache. This should
be faster than the linux file system's caching, and allow us to very quickly gain access to
a high quality slab allocated cache.

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