[HBASE-12989] region_mover.rb unloadRegions method uses ArrayList concurrently resulting in errors

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.98.10
• Fix Version/s: 1.0.0, 1.1.0, 0.98.11
• Component/s: scripts
• Hadoop Flags: Reviewed
• Assignee: Abhishek Singh Chouhan
• Reporter: Abhishek Singh Chouhan
• Created: 09/Feb/15 07:56
• Updated: 06/Apr/18 17:55
• Resolved: 11/Feb/15 20:13

Description

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.