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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13937) Partially revert HBASE-13172
Date Thu, 18 Jun 2015 23:03:03 GMT
Enis Soztutar created HBASE-13937:

             Summary: Partially revert HBASE-13172 
                 Key: HBASE-13937
                 URL: https://issues.apache.org/jira/browse/HBASE-13937
             Project: HBase
          Issue Type: Sub-task
            Reporter: Enis Soztutar
            Assignee: Enis Soztutar
             Fix For: 0.98.14, 1.2.0, 1.1.1, 1.3.0

HBASE-13172 is supposed to fix a UT issue, but causes other problems that parent jira (HBASE-13605)
is attempting to fix. 

However, HBASE-13605 patch v4 uncovers at least 2 different issues which are, to put it mildly,
major design flaws in AM / RS. 

Regardless of 13605, the issue with 13172 is that we catch {{ServerNotRunningYetException}}
from {{isServerReachable()}} and return false, which then puts the Server to the {{RegionStates.deadServers}}
list. Once it is in that list, we can still assign and unassign regions to the RS after it
has started (because regular assignment does not check whether the server is in  {{RegionStates.deadServers}}.
However, after the first assign and unassign, we cannot assign the region again since then
the check for the lastServer will think that the server is dead. 

It turns out that a proper patch for 13605 is very hard without fixing rest of  broken AM
assumptions (see HBASE-13605, HBASE-13877 and HBASE-13895 for a colorful history). For 1.1.1,
I think we should just revert parts of HBASE-13172 for now. 

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