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https://issues.apache.org/jira/browse/HBASE-12989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Abhishek Singh Chouhan updated HBASE-12989:
-------------------------------------------
    Description: 
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.

  was:
While working on HBASE-12822 ran into 
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

This is because 
movedRegions = java.util.ArrayList.new()
is being used concurrently in unloadRegions.


> 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
>
>
> 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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