[HBASE-13855] Race in multi threaded PartitionedMobCompactor causes NPE

• Type: Sub-task
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: hbase-11339
• Fix Version/s: hbase-11339, 2.0.0
• Component/s: mob
• Hadoop Flags: Reviewed
• Assignee: Jingcheng Du
• Reporter: Jingcheng Du
• Created: 08/Jun/15 06:42
• Updated: 17/Jun/22 05:58
• Resolved: 11/Jun/15 10:03

Description

In PartitionedMobCompactor, mob files are split into partitions, the compactions of partitions run in parallel.
The partitions share the same set of del files. There might be race conditions when open readers of del store files in each partition which can cause NPE.
In this patch, we will pre-create the reader for each del store file to avoid this issue.