Todd Lipcon created HDFS-4403:
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Summary: 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
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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