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https://issues.apache.org/jira/browse/HDFS-3177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440350#comment-13440350
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Kihwal Lee commented on HDFS-3177:
----------------------------------
bq. Hi Kihwal, ClientProtocol.append(..) currently returns the last block
locations. Could we use it instead of getting the first block?
No. It can return an empty list, if the end of file coincides with the block
boundary.
> 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-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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