The error message "canCommit() is called for transaction {transaction number} that is not in progress (is known to be invalid)" typically indicates a transaction management issue, where a transaction is either:
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Prematurely Committed or Aborted: The transaction might have been marked as complete or rolled back before the canCommit() call was made.
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Invalidated Due to Conflicts: The transaction could have encountered a conflict, such as concurrent modifications to the same data, which rendered it invalid.
Troubleshooting Steps
Inspect CDAP Logs
Begin by thoroughly examining the CDAP logs for the problematic pipeline. Search for detailed error messages around the "canCommit()" failure, focusing on timestamps that match the failure to identify any preceding warnings or errors that could reveal the root cause.
Check Network Connectivity and Configuration
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VPN: Ensure the VPN connection between Google Cloud and your PostgreSQL database is stable, without packet loss, timeouts, or other connectivity issues.
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Firewall Rules: Verify that your firewall settings permit traffic between Google Cloud and your PostgreSQL instance on the necessary ports.
Review PostgreSQL Log
Examine your PostgreSQL server logs for any errors, warnings, or conflict messages that coincide with the CDAP pipeline failure, paying close attention to the timestamps.
Database Concurrency
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Transactions in Other Tools: Investigate if another tool, script, or program is interacting with the PostgreSQL database in a way that might cause conflicts.
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Transactions Within the Pipeline: Review your pipeline's logic for potential issues with transaction handling, such as unintentional commits, rollbacks, or long-running transactions that could interfere with other stages.
CDAP Components and Resource Contention
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Transaction Timeout: Check your CDAP configuration for any transaction timeouts that might be too short and adjust them if necessary.
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Overloaded Components: Ensure that the CDAP instances handling your pipeline have adequate memory and CPU resources to manage transactions effectively.
Additional Considerations
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CDAP Version: Ensure your CDAP version is up to date. If you're using an older version, check for any known bugs related to this issue and consider upgrading.
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Dependencies: Review your Data Fusion pipeline for outdated or incompatible dependencies that might impact transaction management.
Requesting Additional Information
To provide more tailored advice, please provide the following information:
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PostgreSQL Version: The specific version of PostgreSQL you're using.
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CDAP Version: The version of CDAP Data Fusion in use.
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Simplified Pipeline Structure: A brief description of the relevant pipeline stages (especially source, transforms, and sinks), highlighting any sections that manage transactions.
Additionally, consider whether any recent changes to the pipeline, CDAP Data Fusion platform, or database configuration might correlate with the onset of the issue. Understanding these aspects can significantly aid in diagnosing and resolving the problem.
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