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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3177) Allow DFSClient to find out and use the CRC type being used for a file.
Date Thu, 23 Aug 2012 12:27:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440235#comment-13440235
] 

Kihwal Lee commented on HDFS-3177:
----------------------------------

bq. append additionally requires read permission. I think it is an unacceptable incompatible
change.

How about allowing getBlockLocations() for both read and write?  The block tokens will contain
permission (in mode) so the permission won't be violated on DN.  I would rather get it done
in this jira.

                
> 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: 2.1.0-alpha, 3.0.0
>
>         Attachments: hdfs-3177-after-hadoop-8239-8240.patch.txt, hdfs-3177-after-hadoop-8239.patch.txt,
hdfs-3177-branch2-trunk.patch.txt, hdfs-3177-branch2-trunk.patch.txt, hdfs-3177.patch, hdfs-3177-with-hadoop-8239-8240.patch.txt,
hdfs-3177-with-hadoop-8239-8240.patch.txt, hdfs-3177-with-hadoop-8239-8240.patch.txt, hdfs-3177-with-hadoop-8239.patch.txt
>
>
> 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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