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From "Zhen Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HELIX-522) Helix support for dynamic config
Date Tue, 21 Oct 2014 18:03:34 GMT

     [ https://issues.apache.org/jira/browse/HELIX-522?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Zhen Zhang updated HELIX-522:
    Summary: Helix support for dynamic config  (was: Support dynamic config by Helix)

> Helix support for dynamic config
> --------------------------------
>                 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/Helix+Support+for+Dynamic+Config

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