[jira] Commented: (HBASE-2209) Support of List [ ] in HBaseOutputWritable for serialization

["Kay Kay (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-2209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12831860#action_12831860 ] 

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

declaredClass == List.class does not make sense. it should rely on  Class.isSubClass / similar type inference model. 

> 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
>
>
> 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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