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Date: Wed, 10 Feb 2010 22:58:29 +0000 (UTC)
From: "Kay Kay (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Commented: (HBASE-2209) Support of List [ ] in
 HBaseOutputWritable for serialization
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    [ https://issues.apache.org/jira/browse/HBASE-2209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12832269#action_12832269 ] 

Kay Kay commented on HBASE-2209:
--------------------------------

This is kind of cheating in the sense, while deserializing - all List<T> always comes down an ArrayList<T> . 

As mentioned offline in the IRC by dj_ryan , avro as a generic solution for RPC would address a lot of this. But until that happens - here is the patch. 



> Support of List [ ] in HBaseOutputWritable for serialization 
> -------------------------------------------------------------
>
>                 Key: HBASE-2209
>                 URL: https://issues.apache.org/jira/browse/HBASE-2209
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Kay Kay
>             Fix For: 0.21.0
>
>         Attachments: HBASE-2209.patch, HBASE-2209.patch
>
>
> On a higher language semantics , List < > are very useful for manipulation and when finally sent down to the wire - the protocol currently seems to take only [ ]  through an expensive copy. 
> Supporting List <T > directly would save us the copy in terms of memory and add to faster / deserialization. 

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