[
https://issues.apache.org/jira/browse/HELIX-151?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kanak Biscuitwala updated HELIX-151:
------------------------------------
Fix Version/s: 0.6.2-incubating
> 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
> Fix For: 0.6.2-incubating
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.1#6144)
