Yongjun Zhang created MAPREDUCE-6572:
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Summary: Improved incremental data copy of distcp for truncated
file
Key: MAPREDUCE-6572
URL: https://issues.apache.org/jira/browse/MAPREDUCE-6572
Project: Hadoop Map/Reduce
Issue Type: Bug
Reporter: Yongjun Zhang
Assignee: John Zhuge
MAPREDUCE-5899 improves distcp by supporting incremental data copy. That is, if
a file is only appended since it was copied last time, only new data need to be
copied.
This improvement was done before HDFS truncate feature (HDFS-3107) was
implemented. Since we support truncate, if a large file is truncated a little
bit, the whole file will still need to be copied, even with the solution of
MAPREDUCE-5899.
Creating this jira to improve the situation, by possibly remembering the
smallest truncated size, so there is chance to only append from that size on.
Thanks.
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