Xiaobing Zhou created HDFS-11038:
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Summary: DiskBalancer: support running multiple commands under one
setup of disk balancer
Key: HDFS-11038
URL: https://issues.apache.org/jira/browse/HDFS-11038
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Xiaobing Zhou
Assignee: Xiaobing Zhou
Disk balancer follows/reuses one rule designed by HDFS balancer, that is, only
one instance is allowed to run at the same time. This is correct in production
system to avoid any inconsistencies, but it's not ideal to write and run unit
tests. For example, it should be allowed run plan, execute, scan commands under
one setup of disk balancer. One instance rule will throw exception by
complaining 'Another instance is running'. In such a case, there's no way to do
a full life cycle tests which involves a sequence of commands.
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