# Clover graphs are stuck for a long time

**URL:** <https://forum.cloverdx.com/t/clover-graphs-are-stuck-for-a-long-time/1351>\
**Category:** CloverDX Platform\
**Created:** [February 18, 2014, 12:00am UTC](https://forum.cloverdx.com/t/clover-graphs-are-stuck-for-a-long-time/1351 "2014-02-18T00:00:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![chaitanya\_r](https://avatars.discourse-cdn.com/v4/letter/c/ecccb3/32.png) [@chaitanya\_r](https://forum.cloverdx.com/u/chaitanya_r)\
**Post date:** [February 18, 2014, 12:00am UTC](https://forum.cloverdx.com/t/clover-graphs-are-stuck-for-a-long-time/1351/1 "2014-02-18T00:00:00Z")

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Hi

I am facing an issue where my graph execution clover are stuck for a long time and I don’t see any logs which gives details on why the graphs are stuck for a long time.

Now if I wait for some more time then I am getting an error message saying:

```auto
error executing graph
java.lang.OutOfMemoryError: unable to create new native thread
	at java.lang.Thread.start0(Native Method)
	at java.lang.Thread.start(Thread.java:691)
	at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:949)
	at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1371)
	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:132)
	at com.cloveretl.server.c.b.b.executeWatchDog(Unknown Source)
	at com.cloveretl.server.c.h.f(Unknown Source)
	at com.cloveretl.server.c.h.a(Unknown Source)
	at com.cloveretl.server.c.h.executeGraph(Unknown Source)
	at com.cloveretl.server.c.j.executeGraph(Unknown Source)
	at com.cloveretl.server.c.b.c.a(Unknown Source)
	at com.cloveretl.server.c.b.c.executeGraph(Unknown Source)
	at com.cloveretl.server.c.b.c.executeGraphSync(Unknown Source)
	at org.jetel.component.RunGraph.runGraphThisInstance(RunGraph.java:521)
	at org.jetel.component.RunGraph.runSingleGraph(RunGraph.java:418)
	at org.jetel.component.RunGraph.execute(RunGraph.java:263)
	at org.jetel.graph.Node.run(Node.java:453)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:722)

```

Please help me how to debug this issue? Is there any logs that I need to check other than server logs to see why the graph is stuck? I am using Weblogic server.

---

<div class="post-metadata">

**Author:** ![novakj](https://avatars.discourse-cdn.com/v4/letter/n/47e85d/32.png) [@novakj](https://forum.cloverdx.com/u/novakj)\
**Post date:** [February 19, 2014, 3:17pm UTC](https://forum.cloverdx.com/t/clover-graphs-are-stuck-for-a-long-time/1351/2 "2014-02-19T15:17:10Z")

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Hi chaitanya\_r,

Please verify if you are not hitting OS related limit “max user processes” - on Linux counts also threads. You can see the limit on Linux by command:

```auto
ulimit -u

```

Default limits are usually low and will prevent you to create let’s say more than 1024 threads per Java process.

Another possible reason of this exception and your slow graph execution could be too much concurrently running graphs.

For more detailed answer, could you please specify some details regarding your environment? For example, operating system, CloverETL Designer/Server version, JVM memory settings etc.

---

<div class="post-metadata">

**Author:** ![chaitanya\_r](https://avatars.discourse-cdn.com/v4/letter/c/ecccb3/32.png) [@chaitanya\_r](https://forum.cloverdx.com/u/chaitanya_r)\
**Post date:** [February 28, 2014, 11:39am UTC](https://forum.cloverdx.com/t/clover-graphs-are-stuck-for-a-long-time/1351/3 "2014-02-28T11:39:30Z")

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Thanks a lot, increasing the max user processes on my Linux box has fixed my issue.