How To Fix RSDD_ZA121 - Check for round-robin problems in queues

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDD_ZA - Messages from TREX Aggregate Area

• Message number: 121

• Message text: Check for round-robin problems in queues

What causes this issue?

Some of the preprocessors have round-robin problems.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RSDD_ZA121 - Check for round-robin problems in queues ?

  The SAP error message RSDD_ZA121, which indicates a problem with round-robin processing in queues, typically arises in the context of SAP BW (Business Warehouse) or SAP HANA environments. This error suggests that there may be issues with the distribution of data processing tasks across multiple processes or threads, leading to inefficiencies or failures in data loading or processing.
  Cause:
  
  Queue Configuration Issues: The round-robin distribution mechanism may not be configured correctly, leading to uneven distribution of workload among available processes.
  Resource Contention: If multiple processes are trying to access the same resources simultaneously, it can lead to bottlenecks and failures in processing.
  Data Volume: Large volumes of data being processed can overwhelm the system, especially if the round-robin mechanism is not effectively managing the load.
  System Performance: Insufficient system resources (CPU, memory, etc.) can lead to performance issues, causing the round-robin mechanism to fail.
  Network Issues: If the data is being pulled from or pushed to remote systems, network latency or failures can cause problems.
  
  Solution:
  
  Check Queue Configuration: Review the configuration settings for the queues involved in the data processing. Ensure that they are set up correctly for round-robin distribution.
  Monitor System Resources: Use monitoring tools to check CPU, memory, and I/O usage. If resources are maxed out, consider scaling up your infrastructure or optimizing your data processing jobs.
  Optimize Data Loads: If you are processing large volumes of data, consider breaking them into smaller batches or optimizing the data load process to reduce the load on the system.
  Review Logs: Check the SAP BW or HANA logs for any additional error messages or warnings that could provide more context about the issue.
  Adjust Parallel Processing Settings: If applicable, adjust the settings for parallel processing to ensure that the workload is distributed more evenly across available resources.
  Network Configuration: If network issues are suspected, check the network configuration and performance to ensure that data can be transferred efficiently.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide patches and updates that could resolve underlying issues.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Documentation: Review SAP documentation related to data processing, queues, and performance tuning in BW or HANA environments for best practices and troubleshooting steps.
  
  If the problem persists after trying the above solutions, it may be beneficial to reach out to SAP support for further assistance.