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https://issues.apache.org/jira/browse/HBASE-4182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ramkrishna.s.vasudevan resolved HBASE-4182.
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Resolution: Invalid
> NullPointerException when loadbalancer tries to close the region for
> reassigning to new RS.
> -------------------------------------------------------------------------------------------
>
> Key: HBASE-4182
> URL: https://issues.apache.org/jira/browse/HBASE-4182
> Project: HBase
> Issue Type: Bug
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Fix For: 0.92.0
>
>
> 1. Start 2 RS. Create some regions so that is is balanced.
> 2. Stop RS2. Now all the Regions from RS2 are assigned to RS1.
> 3. Again start RS2.
> 4. Load Balancing is calculated and few regions from RS1 are assigned to RS2.
> As part of this step Master tries to unassign the regions from RS1.
> {noformat}
> RegionTransitionData data = ZKAssign.getDataNoWatch(zkw, ZKAssign
> .getNodeName(zkw, region.getEncodedName()), null);
> if (data.equals(EventType.RS_ZK_REGION_CLOSING)) {
> ZKAssign.createNodeClosing(zkw, region, master.getServerName());
> }
> {noformat}
> Now there is no data present in the unassigned node. We are directly
> comparing the data.
> Here data is null. Hence nullpointer exception is thrown.
> Hence load balancing fails.
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