Master should display currently unassigned regions in UI
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Key: HBASE-2765
URL: https://issues.apache.org/jira/browse/HBASE-2765
Project: HBase
Issue Type: New Feature
Components: master
Affects Versions: 0.21.0
Reporter: Todd Lipcon
The master often knows that a region is unassigned, but thinks it's getting
assigned. It would be very useful to display the current set of unassigned
regions in the UI, as well as their current state (eg where it's supposed to be
getting assigned, how long ago it last heard from it, etc). This would be
useful in debugging/diagnosing cluster issues (eg I just noticed that a client
had hung, took me a while to figure out that I had a region that was repeatedly
failing to open with an NPE due to HBASE-2729)
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