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From "Jason Rutherglen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4026) Use JNA to allocate buffers in the block cache
Date Fri, 24 Jun 2011 01:35:47 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054204#comment-13054204

Jason Rutherglen commented on HBASE-4026:

Ok, so we need to abstract out the allocation part of the block cache, then implement the
same download and install system as we used for LZO.  I guess this issue will not have code,
instead I should open an issue for 'pluggable block cache systems or allocators'.

> Use JNA to allocate buffers in the block cache
> ----------------------------------------------
>                 Key: HBASE-4026
>                 URL: https://issues.apache.org/jira/browse/HBASE-4026
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Jason Rutherglen
>            Priority: Minor
> The HBase block cache can be problematic because it is unpredictable when Java will reclaim
the unused byte arrays using garbage collection.  
> JNA (Java Native Access from Sun/Oracle) provides one possible way to solve this problem.
> https://github.com/twall/jna
> Memory is the name of the class that can be used to test the implementation.
> https://github.com/twall/jna/blob/master/src/com/sun/jna/Memory.java

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