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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10655) ByteRange-fronted slab allocator for on- and off-heap cellblock storage
Date Tue, 22 Jul 2014 15:50:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14070404#comment-14070404

Andrew Purtell commented on HBASE-10655:

HDFS-6709 introduces a slab allocator as hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SlabAllocator.java
. It's simple but can be easily adapted for this issue as a starting point for further refinements.
The hadoop-common code introduces a SlabRegion type that is very similar to our PositionedByteRange.

> ByteRange-fronted slab allocator for on- and off-heap cellblock storage
> -----------------------------------------------------------------------
>                 Key: HBASE-10655
>                 URL: https://issues.apache.org/jira/browse/HBASE-10655
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Andrew Purtell
> Our ByteRange interface has some nice properties such as a compareTo method using hbase-friendly
unsigned byte comparison. This can be backed by either on-heap or off-heap byte buffers. Consider
an allocator that internally allocates huge on or off-heap slabs and hands out ByteRanges
over portions of those arenas. Keep it as simple as possible, optimized for HBase needs. Can
be fairly standalone with respect to the rest of the HBase code. 

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