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https://issues.apache.org/jira/browse/HDFS-4403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13559329#comment-13559329
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Hudson commented on HDFS-4403:
------------------------------
Integrated in Hadoop-trunk-Commit #3265 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/3265/])
HDFS-4403. DFSClient can infer checksum type when not provided by reading
first byte. Contributed by Todd Lipcon. (Revision 1436730)
Result = SUCCESS
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1436730
Files :
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FileChecksumServlets.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/datatransfer.proto
> DFSClient can infer checksum type when not provided by reading first byte
> -------------------------------------------------------------------------
>
> Key: HDFS-4403
> URL: https://issues.apache.org/jira/browse/HDFS-4403
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 2.0.2-alpha
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Minor
> Fix For: 3.0.0, 2.0.3-alpha
>
> Attachments: hdfs-4403.txt, hdfs-4403.txt
>
>
> HDFS-3177 added the checksum type to OpBlockChecksumResponseProto, but the
> new protobuf field is optional, with a default of CRC32. This means that this
> API, when used against an older cluster (like earlier 0.23 releases) will
> falsely return CRC32 even if that cluster has written files with CRC32C. This
> can cause issues for distcp, for example.
> Instead of defaulting the protobuf field to CRC32, we can leave it with no
> default, and if the OpBlockChecksumResponseProto has no checksum type set,
> the client can send OP_READ_BLOCK to read the first byte of the block, then
> grab the checksum type out of that response (which has always been present)
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