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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