PI45445: With two or more synchronous replicas placed, uncommitted transactions are possible after failover.

APAR status

• Closed as program error.

Error description

• When two or more synchronous replicas are defined and a failover
  occurs while transactions are mid-flight, some sync replicas can
  Until the transactions time out on the sync replicas, the
  promoted primary shard can throw
  ReplicationVotedToRollbackExceptions if the minimum synchronous
  replicas option is set (minSyncReplica >=  1 in the deployment
  policy file).
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  WebSphere eXtreme Scale users running with  *
  *                  two or more synchronous replicas that are   *
  *                  defined and placed.                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: With two or more synchronous replicas   *
  *                      placed, uncommitted transactions are    *
  *                      possible after failover.                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When two or more synchronous replicas are defined and a
  failover
  occurs while transactions are mid flight, some synchronous
  replicas can have uncommitted transactions.
  Until the transactions time out on the sync replicas, the
  promoted primary shard can throw
  ReplicationVotedToRollbackExceptions, if the minimum
  synchronous
  replicas option is set (minSyncReplica >=  1) in the deployment
  policy file.
  

Problem conclusion

• The promotion path was fixed to force any additional replicas
  to roll back existing transactions and re-enter peer mode
  against the newly promoted replica shard.
  

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

  WS EXTREME SCAL

• Fixed component ID

  5724X6702

Applicable component levels

• R860 PSY

     UP