kishore gopalakrishna created HELIX-141:
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Summary: Autorebalance does not work reliably and fails when
replica>1
Key: HELIX-141
URL: https://issues.apache.org/jira/browse/HELIX-141
Project: Apache Helix
Issue Type: Bug
Reporter: kishore gopalakrishna
Autorebalance has a bug in calculating the assignment of partitions to nodes.
It does not consider the fact that a partition can have replicas. This was not
tested because we generally use 1 replica ( consumer grouping).
As we are doing this, we might want to fix/add the following features
#1. Allow user to set a minimum number of nodes to be up before computing the
assignment. This minimizes the number of re-assignments when nodes start up.
#2. Have the concept of preferred node for a partition,replica. Which means
when ever a partition,replica is orphaned try to first place it on its
preferred location. Preferred location can be something like (p+r)%N. This will
require us to use the total number of nodes to compute the preferred location.
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