[jira] Commented: (HADOOP-894) dfs client protocol should allow asking for parts of the block map

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

    [ https://issues.apache.org/jira/browse/HADOOP-894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493433 ] 

Hadoop QA commented on HADOOP-894:
----------------------------------

-1, new javadoc warnings

The javadoc tool appears to have generated warning messages when testing the latest attachment http://issues.apache.org/jira/secure/attachment/12356609/partialBlockList.patch against trunk revision r534624.

Test results:   http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/111/testReport/
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/111/console

Please note that this message is automatically generated and may represent a problem with the automation system and not the patch.

> dfs client protocol should allow asking for parts of the block map
> ------------------------------------------------------------------
>
>                 Key: HADOOP-894
>                 URL: https://issues.apache.org/jira/browse/HADOOP-894
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Owen O'Malley
>         Assigned To: Konstantin Shvachko
>             Fix For: 0.13.0
>
>         Attachments: partialBlockList.patch
>
>
> I think that the HDFS client protocol should change like:
> /** The meta-data about a file that was opened. */
> class OpenFileInfo {
>   /** the info for the first block */
>   public LocatedBlockInfo getBlockInfo();
>   public long getBlockSize();
>   public long getLength();
> }
> interface ClientProtocol extends VersionedProtocol {
>   public OpenFileInfo open(String name) throws IOException;
>   /** get block info for any range of blocks */
>   public LocatedBlockInfo[] getBlockInfo(String name, int blockOffset, int blockLength) throws IOException;
> }
> so that the client can decide how much block info to request and when. Currently, when the file is opened or an error occurs, the entire block list is requested and sent.

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