[jira] [Created] (HELIX-272) Provide a mechanism to prevent particular states for a partition to be colocated

["Matthieu Morel (JIRA)" <ji...@apache.org>]

Matthieu Morel created HELIX-272:
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             Summary: Provide a mechanism to prevent particular states for a partition to be colocated
                 Key: HELIX-272
                 URL: https://issues.apache.org/jira/browse/HELIX-272
             Project: Apache Helix
          Issue Type: Improvement
            Reporter: Matthieu Morel


For instance, (for a given partition) we have a master writer and a warm backup that reads from a journal and applies updates. 
If the node hosting the master dies, the warm backup would take over quickly because it would have to read and apply only few updates from the journal.

However, if both the master writer and the warm backup are colocated, this does not work.

Thus it would be good to be able to specify exclusion rules. E.g. prevent some states of a given partition to be colocated, or provide thresholds.



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