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https://issues.apache.org/jira/browse/HBASE-9834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13804681#comment-13804681
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Jesse Yates commented on HBASE-9834:
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KeyValues are immutable, so immutable bytes writable seemed a reasonable use.
Also, I find ByteBuffer much harder to manage - we don't need all the
flipping/setting/removing stuff. Also, in 0.94 we don't have ByteRange (but the
immutable logic still holds from before).
Also, Phoenix uses ImmutableBytesWritable (or rather a subclass) everywhere, so
dovetails nicely with their impl.
> Minimize byte[] copies for 'smart' clients
> ------------------------------------------
>
> Key: HBASE-9834
> URL: https://issues.apache.org/jira/browse/HBASE-9834
> Project: HBase
> Issue Type: Bug
> Components: Client
> Reporter: Jesse Yates
> Assignee: Jesse Yates
> Fix For: 0.94.13
>
> Attachments: hbase-9834-0.94-v0.patch, hbase-9834-0.94-v1.patch
>
>
> 'Smart' clients (e.g. phoenix) that have in-depth knowledge of HBase often
> bemoan the extra byte[] copies that must be done when building multiple
> puts/deletes. We should provide a mechanism by which they can minimize these
> copies, but still remain wire compatible.
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