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Asked: 2024-09-21T18:47:12+05:30

I am encountering a CancellationException while working with Apache Hudi. Can anyone provide insights on what might be causing this issue and how I can resolve it? Any guidance on troubleshooting this problem would be appreciated.

Hey everyone,

I hope you’re all doing well. I’ve been working on a project using Apache Hudi, and I’ve run into a bit of a snag. I keep encountering a `CancellationException` during my write operations, and I’m not entirely sure what could be causing it.

I’ve checked the usual suspects, like ensuring that my configurations are set correctly, but I’m still stumped. Has anyone else experienced this issue?

If you have any insights or tips on troubleshooting this specific problem, I’d really appreciate it! Things like common pitfalls to look for or any log files I should be examining would be super helpful. Thanks in advance for your assistance!

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    3 Answers






    1. Apache Hudi CancellationException Help

      Re: CancellationException during Write Operations in Apache Hudi

      Hi there,

      I totally understand how frustrating it can be to encounter a CancellationException while working with Apache Hudi. I’ve faced similar issues in the past, and there are a few things you might want to check.

      Common Causes and Troubleshooting Tips

      • Check Timeouts: One common reason for cancellation exceptions is timeouts. Inspect your write operation settings to make sure they are not set too low.
      • Concurrency Issues: If multiple write operations are happening simultaneously, there could be contention leading to cancellations. Try running your writes serially to see if that resolves the issue.
      • Resource Availability: Make sure that you have enough resources (CPU, memory) allocated for your operations, as insufficient resources can lead to cancellations. Monitor your cluster’s resource usage during the write operation.
      • Log Files: Look for logs in the hudi.log or application logs for any stack traces or error messages that might provide additional context on what led to the cancellation.
      • Version Compatibility: Ensure that the version of Apache Hudi you are using is compatible with your Spark version. Sometimes upgrading or downgrading can resolve unforeseen issues.

      If none of these seem to resolve the issue, consider posting a more detailed question with the relevant code snippets and configuration settings on forums like Stack Overflow or the Apache Hudi user mailing list. The community can be very helpful!

      Good luck, and I hope you manage to sort it out soon!

      Best,

      [Your Name]







    2. Apache Hudi CancellationException Help

      Hi there!

      It sounds like you’re having a tough time with the CancellationException in Apache Hudi. Here are a few steps and tips that might help you troubleshoot the issue:

      Common Pitfalls

      • Configuration Issues: Double-check your configuration settings in the hudi.properties file. Ensure that all required properties are defined and correct.
      • Timeouts: Sometimes, the write operations may take longer than expected. Try increasing any timeout settings you have configured.
      • Resource Availability: Make sure that your processing environment (like Spark or Hadoop) has sufficient resources (memory, CPU) available to handle the writes.
      • Concurrency: If you have multiple write operations happening simultaneously, this can cause cancellation issues. Ensure that only one write operation occurs at a time.

      Log Files to Check

      Check the following log files for more insights:

      • spark.driver.log – Look for any errors or warnings related to the write operation.
      • hudi.log – This file might have specific logs related to Hudi write operations.
      • application logs – If you’re running this as part of a larger application, check the application logs for any relevant information.

      Additional Tips

      If you can, provide more details about your setup, such as the version of Apache Hudi you are using, the configurations set, and any relevant code snippets. The more information you provide, the better others can assist you!

      Good luck, and I hope you resolve the issue soon!



    3. It sounds like you’re dealing with a common issue in Apache Hudi, where a `CancellationException` can occur during write operations. This could happen due to various reasons, such as a timeout in your write query or resource constraints in your cluster. One of the first steps you should take is to review the timeout settings in your Hudi configuration, including `hudi.write.bulk.insert.timeout` or `hudi.write.operation.timeout`. Additionally, check for any available resources on your Spark cluster, as resource allocation can directly affect your write operations. Monitor your Spark UI to identify if there are any jobs failing or if executor resources are being exhausted.

      Moreover, examining the logs can provide crucial insight. Look specifically at the Hudi logs for any warning or error messages that precede the `CancellationException`. You might want to enable DEBUG or INFO logging levels to gather more detailed information. Also, check for any input data quality issues, such as duplicate keys or schema mismatches, which could lead to unexpected behavior during writes. As a rule of thumb, always ensure your data is clean and adheres to the defined schema before ingestion. If possible, running smaller batches of data can help isolate the issue more effectively.