Unique transient names for processes
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Key: HBASE-3775
URL: https://issues.apache.org/jira/browse/HBASE-3775
Project: HBase
Issue Type: Brainstorming
Reporter: Andrew Purtell
HBASE-3772 is the latest of several incidents where regionservers and master
map their identities to hostnames yet hostname resolution is inconsistent
cluster wide. With HBase 0.20 we have seen this lead conditions like META being
hosted on 11 servers at once. The situation with HBase 0.90 is better but it
concerns me a lot. Confusion about identity cannot be anything but bad.
Why don't we have the processes generate for themselves a random UUID upon
startup, or similar, and have all processes on the cluster map these UUIDs to
identities? Critically, region assignment state should hold the UUID of the
current assignee. This would not remove the need to resolve region locations to
network addresses, nor determine liveness of assignments, but will prevent the
specific double assignment scenarios we have seen if hostname resolution is
flaky.
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