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