Jing Zhao created HADOOP-10608:
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Summary: Support appending data in DistCp
Key: HADOOP-10608
URL: https://issues.apache.org/jira/browse/HADOOP-10608
Project: Hadoop Common
Issue Type: Improvement
Reporter: Jing Zhao
Assignee: Jing Zhao
Currently when doing distcp with -update option, for two files with the same
file names but with different file length or checksum, we overwrite the whole
file. It will be good if we can detect the case where (sourceFile = targetFile
+ appended_data), and only transfer the appended data segment to the target.
This will be very useful if we're doing incremental distcp.
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