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https://issues.apache.org/jira/browse/HELIX-540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lei Xia closed HELIX-540.
-------------------------
Resolution: Fixed
Fix Version/s: 0.6.5
> Full-auto rebalancer not able to map all partitions
> ----------------------------------------------------
>
> Key: HELIX-540
> URL: https://issues.apache.org/jira/browse/HELIX-540
> Project: Apache Helix
> Issue Type: Bug
> Reporter: Zhen Zhang
> Fix For: 0.6.5
>
>
> We discover a bug where full-auto rebalancer not be able to mapping all
> partitions even when capacity is enough.
> Assuming we have 2 partition and 2 node, state model is LeaderStandby and
> replica is 1. For some reason, the current state mapping becomes:
> {noformat}
> partition_0:
> node_0: LEADER
> node_1: STANDBY
> {noformat}
> The extra STANDBY mapping prevents the full-auto rebalancer
> (AutoRebalanceStrategy#computePartitionAssignment) to assign LEADER to
> partition_1, so partition_1 will remain unmapped even though node capacity is
> enough.
> For workaround, we can disable the partition in STANDBY state on the node,
> thus "frees" the quota and the unmapped partition will get assigned LEADER.
> We can then re-enable the partition on the node.
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