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From "Cheng Hao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-7381) Lightweight data transfer for Class Result
Date Wed, 19 Dec 2012 05:25:15 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7381?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Cheng Hao updated HBASE-7381:
-----------------------------

    Attachment:     (was: result_lightweight_copy.patch)
    
> Lightweight data transfer for Class Result
> ------------------------------------------
>
>                 Key: HBASE-7381
>                 URL: https://issues.apache.org/jira/browse/HBASE-7381
>             Project: HBase
>          Issue Type: Improvement
>          Components: Client
>            Reporter: Cheng Hao
>            Priority: Trivial
>             Fix For: 0.94.4
>
>         Attachments: result_lightweight_copy_v2.patch
>
>
> Currently,the data transferring between 2 Result objects in the same process, will cause
additional/unnecessary data parsing & copying; as we have to do that via "Writables.copyWritable(result1,
result2)", which internally is serialization, data copying, and de-serialization.
> The use case are quite common when integrated with Hadoop job running;
> The protocol org.apache.hadoop.mapred.RecordReader defined in Hadoop, provides 3 interfaces:
> 1) K createKey();
> 2) V createValue();
> 3) boolean next(K key, V value) throws IOException;
> In the 3rd method implementation, most likely requires the value (should be Result object)
to be filled, with the Result object from HBase.

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