Yongjun Zhang created HDFS-11706:
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Summary: Enable fallback to regular distcp when distcp failed with
snapshot diff
Key: HDFS-11706
URL: https://issues.apache.org/jira/browse/HDFS-11706
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Yongjun Zhang
When snapshot based distcp failed (-diff), it used to fallback to regular
distcp. However, the fallback was disabled by HDFS-10313, for couple of reasons:
# Safety reason. For example, if user passed wrong parameter to the command
(especially snapshot name), the sync step could fail.
# -diff doesn't allow -delete option, which means, even if we fallback to
regular distcp, distcp doesn't know whether -delete should be applied.
There are two possible approaches to solve this problem:
* introduce a new command line switch, to tell the fallback run whether to
enable -delete
* let the command line option parser to remember whether -delete was passed
initially. If -delete was passed, disable -delete when -diff is passed, then
re-enable -delete when fallback.
This jira is to implement one of these approaches. This applies to -rdiff too.
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