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From "A Sebastian (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HELIX-230) Message generation phase sends messages for partitions that do not exist in a newly generated ideal state
Date Thu, 05 Sep 2013 00:48:52 GMT
A Sebastian created HELIX-230:
---------------------------------

             Summary: Message generation phase sends messages for partitions that do not exist
in a newly generated ideal state
                 Key: HELIX-230
                 URL: https://issues.apache.org/jira/browse/HELIX-230
             Project: Apache Helix
          Issue Type: Bug
          Components: helix-core
            Reporter: A Sebastian


The ResourceComputationStage uses the union of the partitions in the ideal state and the current
states in ZK to generate the resource map. It is this resource map that is used in MessageGenerationPhase.
This causes a couple of issues:

# In the task framework, we need to generate an initial ideal state that contains all the
task partitions. If we don't add these, any ideal state set for some partition by the task
rebalancer are ignored and no messages are sent out.
# When the task rebalancer generates a new ideal state that does not contain a dropped task,
the message generation phase may still send out transitions for DROPPED->INITIAL_STATE.

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