Li Bo created HDFS-9657:
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Summary: Schedule EC tasks at proper time to reduce the impact of
recovery traffic
Key: HDFS-9657
URL: https://issues.apache.org/jira/browse/HDFS-9657
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Li Bo
Assignee: Li Bo
The EC recover tasks consume a lot of network bandwidth and disk I/O.
Recovering a corrupt block requires transferring 6 blocks , hence creating a 6X
overhead in network bandwidth and disk I/O. When a datanode fails , the
recovery of the whole blocks on this datanode may use up the network bandwith.
We need to start a recovery task at a proper time in order to give less impact
to the system.
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