Xiaolin Ha created HBASE-19937:
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Summary: Enable rsgroup NPE in CreateTableProcedure
Key: HBASE-19937
URL: https://issues.apache.org/jira/browse/HBASE-19937
Project: HBase
Issue Type: Bug
Components: rsgroup
Affects Versions: 2.0.0-beta-2
Reporter: Xiaolin Ha
Assignee: Xiaolin Ha
When enable rsgroup, it may throws NPE as follows,
2018-02-02,16:12:45,688 ERROR
org.apache.hadoop.hbase.procedure2.ProcedureExecutor: CODE-BUG: Uncaught
runtime exception: pid=7, state=RUNNABLE:CREATE_TABLE_ASSIGN_REGIONS;
CreateTableProcedure table=hbase:rsgroup
java.lang.NullPointerException
at
org.apache.hadoop.hbase.rsgroup.RSGroupBasedLoadBalancer.generateGroupMaps(RSGroupBasedLoadBalancer.java:254)
at
org.apache.hadoop.hbase.rsgroup.RSGroupBasedLoadBalancer.roundRobinAssignment(RSGroupBasedLoadBalancer.java:162)
at
org.apache.hadoop.hbase.master.assignment.AssignmentManager.createRoundRobinAssignProcedures(AssignmentManager.java:603)
at
org.apache.hadoop.hbase.master.procedure.CreateTableProcedure.executeFromState(CreateTableProcedure.java:108)
at
org.apache.hadoop.hbase.master.procedure.CreateTableProcedure.executeFromState(CreateTableProcedure.java:51)
at
org.apache.hadoop.hbase.procedure2.StateMachineProcedure.execute(StateMachineProcedure.java:182)
at org.apache.hadoop.hbase.procedure2.Procedure.doExecute(Procedure.java:845)
at
org.apache.hadoop.hbase.procedure2.ProcedureExecutor.execProcedure(ProcedureExecutor.java:1458)
at
org.apache.hadoop.hbase.procedure2.ProcedureExecutor.executeProcedure(ProcedureExecutor.java:1227)
at
org.apache.hadoop.hbase.procedure2.ProcedureExecutor.access$800(ProcedureExecutor.java:78)
at
org.apache.hadoop.hbase.procedure2.ProcedureExecutor$WorkerThread.run(ProcedureExecutor.java:1738)
As a result of CreateTableProcedure.rollbackState, it may then print logs
warning TableExistsException as follows,
2018-02-02,16:12:55,503 WARN
org.apache.hadoop.hbase.rsgroup.RSGroupInfoManagerImpl$RSGroupStartupWorker:
Failed to perform check
java.io.IOException: Failed to create group table.
org.apache.hadoop.hbase.TableExistsException: hbase:rsgroup
at
org.apache.hadoop.hbase.rsgroup.RSGroupInfoManagerImpl$RSGroupStartupWorker.createRSGroupTable(RSGroupInfoManagerImpl.java:877)
After some auto-retries, it loops running the thread RSGroupStartupWorker, will
print logs as follows,
2018-02-02,16:23:17,626 INFO
org.apache.hadoop.hbase.rsgroup.RSGroupInfoManagerImpl$RSGroupStartupWorker:
RSGroup table=hbase:rsgroup isOnline=true, regionCount=0, assignCount=0,
rootMetaFound=true
2018-02-02,16:23:17,730 INFO
org.apache.hadoop.hbase.rsgroup.RSGroupInfoManagerImpl$RSGroupStartupWorker:
RSGroup table=hbase:rsgroup isOnline=true, regionCount=0, assignCount=0,
rootMetaFound=true
2018-02-02,16:23:17,834 INFO
org.apache.hadoop.hbase.rsgroup.RSGroupInfoManagerImpl$RSGroupStartupWorker:
RSGroup table=hbase:rsgroup isOnline=true, regionCount=0, assignCount=0,
rootMetaFound=true
2018-02-02,16:23:17,937 INFO
org.apache.hadoop.hbase.rsgroup.RSGroupInfoManagerImpl$RSGroupStartupWorker:
RSGroup table=hbase:rsgroup isOnline=true, regionCount=0, assignCount=0,
rootMetaFound=true
And using shells of rsgroup, it will tips that currently is in "offline mode".
The reason of this problem is that CreateTableProcedure used
RSGroupBasedLoadBalancer, who has member variables initialized depending on
return of CreateTableProcedure.
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