Hunter L created HELIX-801:
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Summary: HELIX: Implement maintenance history for maintenance mode
Key: HELIX-801
URL: https://issues.apache.org/jira/browse/HELIX-801
Project: Apache Helix
Issue Type: Improvement
Reporter: Hunter L
Assignee: Hunter L
This diff implements maintenance history for entering and exiting maintenance
mode.
Changelist:
1. Implement a separate DataUpdater for LeaderHistory ZNode update
2. Implement recording of maintenance history in LeaderHistory ZNode
3. Fix the bug where only the last few history entries are kept
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