Resolving java.lang.OutOfMemoryError: unable to create native thread in SnapLogic
This error typically occurs on Groundplex (on-premise) nodes running on Linux, where system-level resource limits (ulimit) are set too low, preventing the JVM from creating new native threads under high pipeline loads.
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🔍 Root Cause
Linux installations often have conservative default ulimit settings. When SnapLogic pipelines run at higher concurrency or load, the JCC (Java Component Container) node attempts to spawn more threads than the OS allows — resulting in this OutOfMemoryError.
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✅ Recommended Fix: Increase System ulimit Settings
Step 1: Edit the /etc/security/limits.conf file and add the following entries for the snapuser account:
snapuser soft nproc 8192
snapuser hard nproc 65536
snapuser soft nofile 8192
snapuser hard nofile 65536
- nproc — controls the maximum number of processes/threads the user can create.
- nofile — controls the maximum number of open file descriptors.
Step 2: Restart the JCC process to apply the changes:
bash
sudo /opt/snaplogic/bin/jcc.sh restart
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🛠️ Additional Suggestions
| Action | Details |
|---|---|
| Reduce pipeline concurrency | If using Pipeline Execute with a high pool size, consider reducing it to lower thread demand. |
| Monitor JVM memory | Use SnapLogic Monitor → Metrics to check heap/non-heap memory usage on your nodes. |
| Scale your Groundplex | Add more JCC nodes to distribute the load across multiple machines. |
| Review pipeline design | Avoid unnecessarily spawning many concurrent sub-pipelines if not required. |
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📝 Key Takeaway
This is not a heap memory issue — it's an OS-level thread limit problem. The fix is at the Linux system configuration level (limits.conf), not in JVM heap settings (-Xmx). After updating limits.conf and restarting the JCC service, the error should be resolved.
Let me know if you need further assistance! 🚀
