How to capture heap dump while running azure pipeline?

Question

I am facing below OutOfMemoryError: Java heap space error while running my pipeline. I have also tried to increase heap space to 4Gb but still getting same error.

 Caused by:
2023-07-24T10:16:10.8047611Z                     java.lang.OutOfMemoryError: Java heap space
2023-07-24T10:16:10.8047931Z                         at java.base/java.util.HashMap.newNode(HashMap.java:1901)
2023-07-24T10:16:10.8048271Z                         at java.base/java.util.HashMap.putVal(HashMap.java:629)
2023-07-24T10:16:10.8048622Z                         at java.base/java.util.HashMap.putMapEntries(HashMap.java:514)
2023-07-24T10:16:10.8048969Z                         at java.base/java.util.HashMap.<init>(HashMap.java:484)

Now, I am trying to capture heap dump to identify memory leak and root cause of out of memory issue.

Can someone please help me to capture heap dump ?

Hi, I added an answer to the question, i appreciate if you accept and upvote it if it address the solution otherwise feel free to leave comment, i will be glad if i could help — Lunatic, Jul 24 '23 at 19:06
Please consider looking at the solutions here: https://stackoverflow.com/questions/60509976/javascript-heap-out-of-memory-on-azure-build. Also consider running your pipeline manually (e.g. using the Azure extension in VS Code) so you can troubleshoot memory *BEFORE* the OOM crash occurs. — paulsm4, Jul 24 '23 at 21:20

Lunatic · Answer 1 · 2023-07-24T21:12:37.697

How to capture heap dump while running azure pipeline ?

One practice is to using jmap command-line tool on running the pipeline to capture a heap dump in binary format and save it to a file (heapdumpreport.bin). Replace the PID with the process ID of your Java application, the sas-token, name-of-your-container and storage-account-name tags with proper values.

- script: |
    jmap -dump:format=b,file=heapdumpreport.bin <PID>
    azcopy copy heapdumpreport.bin "https://<storage-account-name>.blob.core.windows.net/<name-of-your-container>/heapdumpreport.bin?sas-token"
  displayName: 'Heap Dump Report'

Which this script we used azcopy command to upload the heap dump into your storage account using an SAS token.

How to capture heap dump while running azure pipeline?

1 Answers1