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https://issues.apache.org/jira/browse/HBASE-12989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14313442#comment-14313442
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Andrew Purtell commented on HBASE-12989:
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No reason we couldn't actually replace region_mover.rb with a wrapper script
around a new Java tool.
> region_mover.rb unloadRegions method uses ArrayList concurrently resulting in
> errors
> ------------------------------------------------------------------------------------
>
> Key: HBASE-12989
> URL: https://issues.apache.org/jira/browse/HBASE-12989
> Project: HBase
> Issue Type: Bug
> Components: scripts
> Affects Versions: 0.98.10
> Reporter: Abhishek Singh Chouhan
> Assignee: Abhishek Singh Chouhan
> Priority: Minor
> Fix For: 2.0.0, 1.0.1, 1.1.0, 0.98.11
>
> Attachments: HBASE-12989.patch
>
>
> While working on HBASE-12822 ran into
> {quote}
> 15/02/04 13:16:44 [main] INFO reflect.GeneratedMethodAccessor35(?): Pool
> completed
> NoMethodError: undefined method `toByteArray' for nil:NilClass
> __for__ at region_mover.rb:270
> each at
> file:/home/sfdc/installed/bigdata-hbase__hbase.6_prod__9707645_Linux.x86_64.prod.runtime.bigdata-hbase_bigdata-hbase/hbase/hbase/lib/jruby-complete-1.6.8.jar!/builtin/java/java.util.rb:7
> writeFile at region_mover.rb:269
> unloadRegions at region_mover.rb:347
> (root) at region_mover.rb:501
> {quote}
> This is because
> movedRegions = java.util.ArrayList.new()
> is being used concurrently in unloadRegions.
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