IT27067: HANG MAY OCCUR WITH COLUMN ORGANIZED QUERY IN DPF ENVIRONMENT WHERE AGENT CANNOT BE FORCED

APAR status

• Closed as program error.

Error description

• In a Column Organized DPF environment a query may hang which
  cannot then be forced off.
  The stack trace on for the hanging query on one of the data
  nodes will show the following:
  <StackTrace>
  -------Frame------ ------Function + Offset------
  0x0900000000113194 thread_wait + 0x94
  0x0900000034B91414 sqloWaitEDUWaitPost + 0x434
  0x090000003587C5C0 sqkfChannel::WaitRecvReady(int,int) + 0x1220
  0x090000003588EE20
  sqkfChannel::ReceiveAnyBuffer(sqkfBuffer**,int,int*) + 0x680
  0x0900000038CAF988 sqlkq_process_ctl_msg(SQLKQ_CB*,int,unsigned
  int) + 0x788
  0x0900000049753074
  sqlkq_process_stopwrite(sqeAgent*,SQLKQ_CB*,int) + 0x2B4
  0x0900000049752124 ibm_cde::query::TableQueueWriter::send(bool)
  + 0x484
  0x0900000049752870
  ibm_cde::query::TableQueueWriter::sendWU(bool) + 0xC0
  0x09000000496AE6C8
  ibm_cde::query::TableQueueWriteEvaluator::createAndWriteMiniWU(u
  nsigned
  long,std::vector<ibm_cde::services::CountedPtrWithCopy<const
  ibm_cde::types::VectorBase<0,0>,2,1>,ibm_cde::services::Allocato
  r<ibm_cde::services::CountedPtrWithCopy<const
  ibm_cde::types::VectorBase<0,0>,2,1> > >&,unsigned
  long,ibm_cde::query::TableQueueWriter*,short,unsigned int&) +
  0x3D8
  0x09000000496D6AE4
  ibm_cde::query::TableQueueWriteScatterEvaluator::processInputsSy
  nchronously() + 0x6A4
  0x090000004794EB70
  ibm_cde::query::Evaluator::evaluate(bool,bool,ibm_cde::query::Ev
  aluator::EvaluatorRestartState&,ibm_cde::query::OptPredicateTrac
  ker*) + 0x1040
  0x0900000047CD6ECC
  ibm_cde::query::EvaluationRoutine::evaluate(unsigned
  int,sql_static_data*) + 0x3DC
  0x0900000049436350
  ibm_cde::query::Scheduler::evaluateChain(ibm_cde::query::Evaluat
  ionRoutine*,unsigned long&) + 0x370
  0x0900000049433248
  ibm_cde::query::Scheduler::runWorkerThread(void*,int*) + 0x318
  0x090000004943E8B0
  ibm_cde::query::cdeEntryPointImpl(sqeAgent*,void*,void*) + 0xA0
  0x090000004C8274C4 cdeInterface::startCdeSubagent(sqeAgent*) +
  0xB4
  0x0900000037CB3408 sqlriInvokeCde(sqlrr_cb*) + 0x48
  0x0900000037CD8998 sqlriSectInvoke(sqlrr_cb*,sqlri_opparm*) +
  0x618
  0x0900000039E75A08 sqlrr_smp_router(sqlrr_cb*) + 0x188
  0x0900000039E71EC8
  sqlrr_subagent_router(sqeAgent*,SQLE_DB2RA_T*) + 0xFC8
  0x0900000039E54020 IPRA.$sqleSubRequestRouter(sqeAgent*,unsigned
  int*,unsigned long*) + 0x7C0
  0x0900000039E4E0C8 sqleProcessSubRequest(sqeAgent*) + 0x2C28
  0x0900000034BAABCC sqeAgent::RunEDU() + 0x9EC
  0x0900000034B8D7C0 sqzEDUObj::EDUDriver() + 0x300
  0x0900000034A7C714 sqloEDUEntry + 0x374
  </StackTrace>
  
  An instance restart will be required to clear the hanging agent.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * ALL                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Db2 11.1 Mod 4 Fixpack 5 or higher                *
  ****************************************************************
  

Problem conclusion

• First fixed in Db2 11.1 Mod 4 Fixpack 5
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels

• RB10 PSN

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