Single unassigned directory is very slow when there are many unassigned nodes
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Key: HBASE-4324
URL: https://issues.apache.org/jira/browse/HBASE-4324
Project: HBase
Issue Type: Bug
Components: zookeeper
Affects Versions: 0.92.0
Reporter: Todd Lipcon
Fix For: 0.94.0
Because we use a single znode for /unassigned, and we re-list it every time its
contents change, assignment speed per region is O(number of unassigned regions)
rather than O(1). Every time something changes about one unassigned region, the
master has to re-list the entire contents of the directory inside of
AssignmentManager.nodeChildrenChanged().
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