[HBASE-13892] Scanner with all results filtered out results in NPE

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.1.0
• Fix Version/s: 0.98.14, 1.0.2, 1.2.0, 1.1.1, 2.0.0
• Component/s: Client
• Hadoop Flags: Reviewed
• Assignee: Josh Elser
• Reporter: Josh Elser
• Created: 12/Jun/15 00:05
• Updated: 31/Aug/15 22:39
• Resolved: 12/Jun/15 02:28

Description

Saw a failure during some testing with region_mover.rb

NativeException: java.lang.NullPointerException: null
        __ensure__ at /usr/hdp/current/hbase-master/bin/region_mover.rb:110
  isSuccessfulScan at /usr/hdp/current/hbase-master/bin/region_mover.rb:109
  isSuccessfulScan at /usr/hdp/current/hbase-master/bin/region_mover.rb:104
     unloadRegions at /usr/hdp/current/hbase-master/bin/region_mover.rb:328

To try to get a real stacktrace, I wrote a simple test. Turns out, it was really simple to just produce the NPE within ClientScanner.

java.lang.NullPointerException: null
	at org.apache.hadoop.hbase.client.ClientScanner.getResultsToAddToCache(ClientScanner.java:576)
	at org.apache.hadoop.hbase.client.ClientScanner.loadCache(ClientScanner.java:492)
	at org.apache.hadoop.hbase.client.ClientScanner.next(ClientScanner.java:364)

Patch with fix and test incoming.