IO17493: [MDVREGR IO15073] MTR replication sends multiple adds/deletes for same operation.

Tivoli Directory Server, Version 6.2.0.27-ISS-ITDS-IF0027
Tivoli Directory Server, Version 6.2.0.29-ISS-ITDS-IF0029
Tivoli Directory Server, Version 6.2.0.30-ISS-ITDS-IF0030

APAR status

• Closed as program error.

Error description

• Multi-threading Replication(MTR) transmits multiple add/deletes
  for the same operation.
  
  In order to duplicate this condition, we need to:
  1. Create 4 instance and add sample data to all.
  2. Configure a 4 way peer to peer topology between them.
     (Like PP replication 1-2, 2-3, 3-4, 4-1)
  3. configure the topology to use MTR
  4. configure the ibm-replicaconsumerconnections=5
  
  With this configuration, we observe:
  A. On adds, although we have a single operation on the supplier,
     we see this results in multiple operations on the consumer(s)
  B. The same is true for deletes.
  

Local fix

• Disable Multi-threading Replication.
  

Problem summary

• The APAR IO15073 enabled MTR to use "last Change Id" instead of
  the "last Sent Id". This caused MTR to push one change multiple
  number of times. MTR should use "last Sent Id".
  
  Solution:
  Code has been changed to use "last Sent Id" for MTR.
  

Problem conclusion

• This problem was introduced by APAR IO15073 which is contained
  in the following maintenance packages:
  | MDVREGR 6.2.0.26-ISS-ITDS-IF0026 |
  | MDVREGR 6.2.0.25-ISS-ITDS-IF0025 |
  | MDVREGR 6.2.0.24-ISS-ITDS-FP0024 |
  | MDVREGR 6.2.0.24-ISS-ITDS-IF0024 |
  | MDVREGR 6.2.0.23-ISS-ITDS-IF0023 |
  | MDVREGR 6.2.0.22-ISS-ITDS-IF0022 |
  | MDVREGR 6.2.0.21-TIV-ITDS-IF0021 |
  | MDVREGR 6.2.0.20-TIV-ITDS-IF0020 |
  The fix for this APAR will be contained in the following
  maintenance packages:
  | interim fix | 6.2.0.27-ISS-ITDS-IF0027 |
  

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:

  IO17593 IO17596

Fix information

• Fixed component name

  IBM TIV DIR SER

• Fixed component ID

  5724J3960

Applicable component levels

• R620 PSY

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