Jinglun created HDFS-15640:
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Summary: RBF: Add fast distcp threshold to FedBalance.
Key: HDFS-15640
URL: https://issues.apache.org/jira/browse/HDFS-15640
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Jinglun
Currently in the DistCpProcedure it must submit distcp round by round until
there is no diff to go to the final distcp stage. The condition is very strict.
If the distcp could finish in an acceptable period then we don't need to wait
for no diff. For example if 3 consecutive distcp jobs all finish within 10
minutes then we can predict the final distcp could also finish within 10
minutes. So we can start the final distcp directly.
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