Zhen Zhang created HELIX-522:
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Summary: Support dynamic config by Helix
Key: HELIX-522
URL: https://issues.apache.org/jira/browse/HELIX-522
Project: Apache Helix
Issue Type: New Feature
Reporter: Zhen Zhang
We are seeing a couple of use cases where an online service may need to roll
out a set of new configs in a coordinated way without bouncing the
service.Helix can be extended to support this. The basic idea is to generalize
ideal-state to support multi-dimensional mappings. Currently Helix uses
ideal-state to define the target mapping from a partition to the placement and
state of the partition (i.e. partition->(placement, state). The mapping can be
extended to support another attribute, say config-version, so it would be
partition->(placement, state, config-version). Helix controller is then able to
bring the system to the target mappings in a coordinated way. Here is a high
level design for this:
https://cwiki.apache.org/confluence/display/HELIX/Support+Dynamic+Config
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