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https://issues.apache.org/jira/browse/HDFS-3177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440674#comment-13440674
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Sanjay Radia commented on HDFS-3177:
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Mixed checksums in a should not be allowed.
If we don't allow a different checksum for append then mixed checksums can
occur only due to concat. Is the checksum type also stored on NN? If so we can
prevent the concact of such files.
> 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-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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