NPE in AssignmentManager if processing shutdown of RS who doesn't have any
regions assigned to it
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Key: HBASE-3283
URL: https://issues.apache.org/jira/browse/HBASE-3283
Project: HBase
Issue Type: Bug
Components: master
Affects Versions: 0.90.0
Reporter: Jonathan Gray
Assignee: Jonathan Gray
Fix For: 0.90.0, 0.92.0
Attachments: HBASE-3283-v1.patch
When doing server shutdown, we do the following:
{noformat}
deadRegions = new TreeSet<HRegionInfo>(this.servers.remove(hsi));
{noformat}
This removes the list of regions currently assigned to the specified server
from the master in-memory state. But it's possible that the remove returns
null (have seen it in running production cluster).
We should check if this is null and just return if so.
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