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From "Tsz Wo (Nicholas), SZE (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2919) Add method(s) to FSDatasetInterface for checking if the scanners are supported
Date Thu, 09 Feb 2012 23:36:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13205042#comment-13205042
] 

Tsz Wo (Nicholas), SZE commented on HDFS-2919:
----------------------------------------------

Below the dependencies:

- DirectoryScanner requires
-* FSDatasetInterface.getVolumes();
-* FSDatasetInterface.getFinalizedBlocks(String bpid);
-* FSDatasetInterface.getBlockPoolList();
-* FSDatasetInterface.checkAndUpdate(..);
-* FSVolumeInterface.getBlockPoolList()
-* FSVolumeInterface.getFinalizedDir(String bpid)
 
- DataBlockScanner requires
-* FSDatasetInterface.getVolumes();
-* FSDatasetInterface.getFinalizedBlocks(String bpid);
-* FSDatasetInterface.contains(ExtendedBlock block);
-* FSVolumeInterface.getDirectory(String bpid)
                
> Add method(s) to FSDatasetInterface for checking if the scanners are supported
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-2919
>                 URL: https://issues.apache.org/jira/browse/HDFS-2919
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>
> DataNode currently checks the class of DataNode.data to determine whether it supports
DirectoryScanner and/or DataBlockScanner.  It is better to have some method(s) in FSDatasetInterface
to reveal this information.

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