Vinayak Borkar created HELIX-137:
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Summary: Add a resource in Helix whose state is governed by the
state of other resources
Key: HELIX-137
URL: https://issues.apache.org/jira/browse/HELIX-137
Project: Apache Helix
Issue Type: Improvement
Components: helix-core
Reporter: Vinayak Borkar
Currently resource states are governed by state transitions which are triggered
by the controller based on state machine constraints. It would be useful to
have a type of resource that users can register in Helix whose state is
dictated by the state of other resources in the system.
For example, a MACHINE resource could be created in Helix whose state is
governed by the state of the resource partitions that are assigned to that
machine. When all partition masters assigned to a machine reach master state,
the machine resource's state could be computed as "ONLINE" and this could
trigger a transition on that machine.
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