Retain znodes for all regions in UNASSIGNED (zookeeper)
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Key: HBASE-4774
URL: https://issues.apache.org/jira/browse/HBASE-4774
Project: HBase
Issue Type: Brainstorming
Components: master
Reporter: Karthik Ranganathan
We delete znodes from UNASSIGNED once a region is opened and the open is
entered into META.
A lot of multiple assignment issues arise from the fact that we delete this
znode and dont have state information after the region is opened. So one
proposal is to always retain the znodes in META and never delete the regions
from UNASSIGNED. That way we can have a simple, deterministic state machine for
each region. We could bucket the regions into sub-directories using a
deterministic hash or the region prefixes.
Note that what we put in zk is not permanent state but just the state of the
cluster that is running. This state is invalid upon cluster restart - so we are
still storing temporary data in zk.
Thoughts?
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