Xiaobing Zhou created HDFS-9790:
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Summary: HDFS Balancer should exit with a proper message if
upgrade is not finalized
Key: HDFS-9790
URL: https://issues.apache.org/jira/browse/HDFS-9790
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Xiaobing Zhou
Assignee: Xiaobing Zhou
PROBLEM: Currently if the upgrade is not finalized the balancer just exits as
it cannot move any blocks as no deletes can go through the datanodes before a
finalize. This is not clear to customers as many in the field do not even
understand what an upgrade finalized action does in HDFS.
EXPECTED BEHAVIOR:
Balancer should exit saying something like "Balancer exiting as upgrade is not
finalized. Please finalize the hdfs upgrade before running the balancer"
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