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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7692) Add utility class to generate ordered byte[] serialization
Date Sun, 03 Mar 2013 00:47:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13591580#comment-13591580

James Taylor commented on HBASE-7692:

This is definitely not just client side. Phoenix would use this in the innermost loops of
coprocessor region scans and custom filter evaluation. We need a bytes pointer mechanism,
otherwise you're forced to copy into a byte array. Reuse of the byte arrays is often not possible
because you don't know the size in advance. It certainly doesn't have to be the Hadoop ImmutableBytesWritable,

Any opinion, [~lhofhansl]?

To get folks to use the Orderly stuff is a different, bigger question. If Hive and Phoenix
adopt it, you'd get those users. If we deprecate the Bytes utils for serializaing/deserializaing
and point to the new stuff (explaining why it's better), that might help. You could have a
simple cover over the Orderly classes for the common case to make it easier.
> Add utility class to generate ordered byte[] serialization
> ----------------------------------------------------------
>                 Key: HBASE-7692
>                 URL: https://issues.apache.org/jira/browse/HBASE-7692
>             Project: HBase
>          Issue Type: Improvement
>          Components: util
>            Reporter: Nick Dimiduk
>            Assignee: Nick Dimiduk
>             Fix For: 0.95.0
>         Attachments: HBASE-7692.v1.patch, HBASE-7692.v2.patch, HBASE-7692.v3.patch, HBASE-7692.v4.patch,
> The current Bytes utility class works, but produces output that does not maintain the
native sort ordering of the input value. This results in, for example, a negative value that
does not necessarily sort before a positive value. HBase should provide a canonical implementation
of such a serialization format so that third-parties can reliably build on top of HBase. This
will allow an implementation for HIVE-3634, HIVE-2599, or HIVE-2903 that is compatible with
similar features in Pig.

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