stack created HBASE-21191:
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Summary: Add a holding-pattern if no assign for meta or namespace
(Can happen if masterprocwals have been cleared).
Key: HBASE-21191
URL: https://issues.apache.org/jira/browse/HBASE-21191
Project: HBase
Issue Type: Sub-task
Components: amv2
Reporter: stack
Assignee: stack
If the masterprocwals have been removed -- operator error, hdfs dataloss, or
because we have gotten ourselves into a pathological state where we have
hundreds of masterprocwals too process and it is taking too long so we just
want to startover -- then master startup will have a dilemma. Master startup
needs hbase:meta to be online. If the masterprocwals have been removed, there
may be no outstanding assign or a servercrashprocedure with coverage for
hbase:meta (I ran into this issue repeatedly in internal testing purging
masterprocwals on a large test cluster). Worse, when master startup cannot find
an online hbase:meta, it exits after exhausting the RPC retries.
So, we need a holding-pattern for master startup if hbase:meta is not online if
only so an operator can schedule an assign for meta or so they can assign fixup
procedures (HBASE-20786 has discussion on why we cannot just auto-schedule an
assign of meta).
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