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From "Karthik Ranganathan (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4774) Retain znodes for all regions in UNASSIGNED (zookeeper)
Date Fri, 11 Nov 2011 20:28:51 GMT
Retain znodes for all regions in UNASSIGNED (zookeeper)

                 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.


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