[HBASE-8082] Fixing NullPointerException in org.apache.hadoop.hbase.regionserver.HRegion.RegionScanner.nextRows.

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.89-fb
• Fix Version/s: 0.89-fb
• Component/s: regionserver
• Hadoop Flags: Reviewed
• Assignee: Unassigned
• Reporter: Manukranth Kolloju
• Created: 12/Mar/13 21:21
• Updated: 16/Jun/22 05:51
• Resolved: 13/Mar/13 05:02

Description

The problem here was that the scan prefetch thread captured the IOExceptions and stored in the return value when the next() call was made on the RegionScanner. The RegionServer was supposed to check if there was an IOException inside the ScanPrefetch thread and throw that IOException. The result from ScanPrefetch being referenced even when the ScanPrefetch thread experienced an IOException caused a NullPointerException in the RegionServer and thus the original IOException's data was lost.