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What is the best way to troubleshoot an application/job that is taking longer than usual?

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Contributor

Hi experts,

I was wondering what is the best way to troubleshoot an application or job that is taking longer than usual. Maybe a 5minute job that is taking 1 hour or longer to complete etc.

What are some things I should start looking at first? Or can someone bring me through the process?

 

Thanks,

3 REPLIES 3

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Rising Star

@ryu 
1.Check the queue that job is running in. See if that is allocated enough resources.
2.See if the queue is pending containers is showing or not.
3.If all these things are fine then start checking the locality if the job is running in node local or rack local.
4. Then go to node manager level and debug for local unix level slowness

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Rising Star

@ryu  Please accept this as solution if your issue is resolved by the suggestion

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Super Collaborator

When an application or job that typically completes in a short time is taking significantly longer than expected, it's essential to systematically troubleshoot the issue to identify and resolve the bottleneck. Here are some steps and areas to focus on when diagnosing performance issues in such scenarios:

1. Understand the Baseline and Gather Information

  • Historical Performance Data: Compare the current run with previous runs. Identify what has changed in terms of input size, configuration, environment, etc.
  • Logs and Metrics: Gather logs and metrics from the application, YARN ResourceManager, and NodeManager.

2. Monitor Resource Utilization

  • CPU, Memory, and Disk Usage: Check the resource usage on the nodes running the application. High CPU, memory, or disk I/O usage can indicate bottlenecks.
  • Network Utilization: Check network usage, especially if the job involves significant data transfer between nodes.

3. Examine YARN and Application Logs

  • YARN Logs: Access the logs through the YARN ResourceManager web UI. Look for errors, warnings, and unusual delays.
  • Application Master (AM) Logs: Review the AM logs for any signs of retries, timeouts, or other issues.
  • Container Logs: Check the logs of individual containers for errors and performance issues.

4. Check for Resource Contention

  • NodeManager Logs: Look for signs of resource contention, such as high wait times for container allocation.
  • Cluster Load: Check if other jobs are running concurrently and consuming significant resources.

5. Investigate Job Configuration

  • Parallelism: Ensure the job is correctly configured for parallel execution (e.g., number of mappers and reducers in a MapReduce job).
  • Resource Allocation: Verify that the job has sufficient resources allocated (e.g., memory, vCores).

6. Data Skew and Distribution

  • Data Skew: Analyze the input data for skew. Uneven data distribution can cause some tasks to take much longer than others.
  • Task Distribution: Check if certain tasks or stages are taking disproportionately longer.

7. Network and I/O Bottlenecks

  • Shuffle and Sort Phase: In Hadoop and Spark, the shuffle phase can be a bottleneck. Monitor the shuffle performance and look for skew or excessive data transfer.
  • HDFS or Storage I/O: Ensure that the underlying storage (HDFS, S3, etc.) is performing optimally and there are no bottlenecks.

8. Garbage Collection and JVM Tuning

  • GC Logs: If the application is JVM-based, check the garbage collection logs for excessive GC pauses.
  • JVM Heap Size: Verify that the JVM heap size is appropriately configured to avoid frequent GC.

9. Configuration Parameters and Tuning

  • YARN Configuration: Check for misconfigurations in YARN resource allocation settings.
  • Application-specific Tuning: Tune parameters specific to the application framework (e.g., Spark, MapReduce).

10. External Dependencies

  • External Services: If the application interacts with external services (e.g., databases, APIs), ensure they are not the bottleneck.
  • Dependency Failures: Look for timeouts or failures in external service calls.

Detailed Steps for Specific Frameworks

For Hadoop MapReduce Jobs

  1. Check Job History Server:

    • Analyze the job in the Job History Server web UI.
    • Identify slow tasks and investigate their logs.
  2. Analyze Task Attempts:

    • Look for tasks that have failed and retried multiple times.
    • Identify tasks with unusually high execution times.

For Apache Spark Jobs

  1. Spark UI:

    • Use the Spark web UI to analyze stages, tasks, and jobs.
    • Look for stages that have long task durations or high task counts.
  2. Executor Logs:

    • Check the logs of individual Spark executors for errors and warnings.
  3. Driver Logs:

    • Examine the driver logs for signs of job bottlenecks or delays.

Conclusion

Systematically troubleshooting a job that is taking longer than usual involves a combination of monitoring resource utilization, examining logs, analyzing job configurations, and investigating data distribution and skew. By following these steps and using the right tools, you can identify and resolve the performance bottlenecks effectively. If the issue persists, consider breaking down the problem further or seeking help from more detailed profiling tools or experts familiar with your specific application framework and environment.