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Posted to issues@hbase.apache.org by "James Taylor (JIRA)" <ji...@apache.org> on 2013/03/02 21:27:14 UTC
[jira] [Commented] (HBASE-7692) Add utility class to generate
ordered byte[] serialization
[ https://issues.apache.org/jira/browse/HBASE-7692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13591503#comment-13591503 ]
James Taylor commented on HBASE-7692:
-------------------------------------
I'm investigating moving Phoenix to use Orderly. It's very similar to what we're doing today, but has more functionality with a cleaner API.
[~saint.ack@gmail.com] The Writable stuff is used as a bytes pointer, not as a client/server data exchange mechanism. Phoenix uses them the same way. It's just a lightweight way to have an offset/length into a byte array. You can also reset the byte[],offset,length on an instance which prevents having to re-instantiate a new one every time (unlike the java.nio.ByteBuffer)
The permutations are useful. One set of them instantiate a new object on deserialize (for Java native object types like Integer and Long), while the others reuse a byte buffer to hand you back what was deserialized. Both are useful under different circumstances. We'll try to use the latter.
It'd be great if this could be packaged as a separate maven module such that Phoenix can depend on it since it's still on the 0.94 branch.
> 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, HBASE-7692.v5.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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