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https://issues.apache.org/jira/browse/HDFS-3177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13244535#comment-13244535
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Kihwal Lee commented on HDFS-3177:
----------------------------------

Posting a patch for feedback. I am doing more testing and there will be new 
test cases.
So far, I verified that FileSystem.getFileChecksum() works across branch-1 and 
trunk with this patch via hftp. httpfs should work fine. webhdfs will break 
without HDFS-3176 after the common portions of HADOOP-8060 are committed. 
                
> Allow DFSClient to find out and use the CRC type being used for a file.
> -----------------------------------------------------------------------
>
>                 Key: HDFS-3177
>                 URL: https://issues.apache.org/jira/browse/HDFS-3177
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, hdfs client
>    Affects Versions: 0.23.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 0.23.3, 2.0.0, 3.0.0
>
>         Attachments: hdfs-3177.patch
>
>
> To support HADOOP-8060, DFSClient should be able to find out the checksum 
> type being used for files in hdfs.
> In my prototype, DataTransferProtocol was extended to include the checksum 
> type in the blockChecksum() response. DFSClient uses it in getFileChecksum() 
> to determin the checksum type. Also append() can be configured to use the 
> existing checksum type instead of the configured one.

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