[HBASE-28241] The snapshot operation encountered an NPE and failed.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-beta-1
• Fix Version/s: 2.6.0, 3.0.0-beta-1
• Component/s: proc-v2, snapshots
• Hadoop Flags: Reviewed
• Assignee: Haiping lv
• Reporter: Haiping lv
• Created: 05/Dec/23 02:38
• Updated: 13/Dec/23 21:04
• Resolved: 12/Dec/23 15:21

Description

Executing a merge region before the snapshot operation is completed will result in an NPE error for the snapshot operation and cause it to fail

Triggering logic

1. Execute the snapshot command.
2. Merge regions before the snapshot is completed.
3. After the merge is completed, the two parent regions will be cleaned up.
4. An NPE will be reported when the snapshot operation is performed on that parent region. The log is as follow:

2023-11-20T23:26:07,061 ERROR [PEWorker-13] procedure2.ProcedureExecutor: CODE-BUG: Uncaught runtime exception: pid=238720, ppid=238714, state=RUNNABLE, hasLock=true; SnapshotRegionProcedure c47539f1d6032ba1a037f5279c22baa0
java.lang.NullPointerException: null
        at org.apache.hadoop.hbase.master.procedure.SnapshotRegionProcedure.execute(SnapshotRegionProcedure.java:160) ~[hbase-server-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
        at org.apache.hadoop.hbase.master.procedure.SnapshotRegionProcedure.execute(SnapshotRegionProcedure.java:58) ~[hbase-server-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
        at org.apache.hadoop.hbase.procedure2.Procedure.doExecute(Procedure.java:921) ~[hbase-procedure-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
        at org.apache.hadoop.hbase.procedure2.ProcedureExecutor.execProcedure(ProcedureExecutor.java:1649) ~[hbase-procedure-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
        at org.apache.hadoop.hbase.procedure2.ProcedureExecutor.executeProcedure(ProcedureExecutor.java:1395) ~[hbase-procedure-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
        at org.apache.hadoop.hbase.procedure2.ProcedureExecutor.access$1000(ProcedureExecutor.java:75) ~[hbase-procedure-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
        at org.apache.hadoop.hbase.procedure2.ProcedureExecutor$WorkerThread.runProcedure(ProcedureExecutor.java:1961) ~[hbase-procedure-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
        at org.apache.hadoop.hbase.trace.TraceUtil.trace(TraceUtil.java:216) ~[hbase-common-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
        at org.apache.hadoop.hbase.procedure2.ProcedureExecutor$WorkerThread.run(ProcedureExecutor.java:1988) ~[hbase-procedure-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT] 

Issue Links

• links to: GitHub Pull Request #5560