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https://issues.apache.org/jira/browse/HELIX-151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13728310#comment-13728310
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Hudson commented on HELIX-151:
------------------------------
FAILURE: Integrated in helix #1097 (See
[https://builds.apache.org/job/helix/1097/])
HELIX-151: rb:13209 Allow nodes using floor capacity to steal a slot (kishoreg:
rev 91b32bff94262a459e982b9abfadefa48d8303c9)
*
helix-core/src/main/java/org/apache/helix/controller/strategy/AutoRebalanceStrategy.java
* helix-core/pom.xml
> Auto rebalance doesn't assign some replicas when other nodes could make room
> ----------------------------------------------------------------------------
>
> Key: HELIX-151
> URL: https://issues.apache.org/jira/browse/HELIX-151
> Project: Apache Helix
> Issue Type: Bug
> Components: helix-core
> Reporter: Kanak Biscuitwala
> Assignee: Kanak Biscuitwala
> Priority: Minor
> Attachments:
> 0001-HELIX-151-Allow-nodes-using-floor-capacity-to-steal-.patch
>
>
> The current auto-rebalancer tries to evenly distribute replicas across nodes
> by dividing the number of replicas by number of nodes, and then assigning the
> floor as a capacity to some nodes and the ceiling as a capacity to other
> nodes. Right now, nodes 0..k are assigned the ceiling and k+1..n are assigned
> the floor. Given existing assignments, an orphaned partition could be
> assigned to a node in the second set if that node had an extra slot, and
> there's at least one node in the first set with available capacity, then the
> latter node should be able to "donate" a unit of capacity to the former node.
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