| Summary: | Jmeter hang when testing javasampler because HashMap.put() is called from multiple threads without sync. | ||
|---|---|---|---|
| Product: | JMeter - Now in Github | Reporter: | Ejay <g7n3f> |
| Component: | Main | Assignee: | JMeter issues mailing list <issues> |
| Status: | RESOLVED FIXED | ||
| Severity: | major | CC: | g7n3f |
| Priority: | P2 | ||
| Version: | 2.12 | ||
| Target Milestone: | --- | ||
| Hardware: | PC | ||
| OS: | All | ||
| Attachments: | jstack info | ||
Invoking HashMap.put() from multiple threads casue jmeter hanging
I think the solution is:
change java file ：src/protocol/java/org/apache/jmeter/protocol/java/sampler/JavaSampler.java at line 60
//private static final Set<JavaSampler> TEAR_DOWN_SET = new HashSet<JavaSampler>();
private static final Set<JavaSampler> TEAR_DOWN_SET = Collections.newSetFromMap(new ConcurrentHashMap<JavaSampler,Boolean>());
Thanks very much for the report. The fix has been applied and will be in the next release of JMeter URL: http://svn.apache.org/r1694819 Log: JMeter hang when testing javasampler because HashMap.put() is called from multiple threads without sync. Bugzilla Id: 58209 Modified: jmeter/trunk/src/protocol/java/org/apache/jmeter/protocol/java/sampler/JavaSampler.java jmeter/trunk/xdocs/changes.xml This issue has been migrated to GitHub: https://github.com/apache/jmeter/issues/3643 |
Created attachment 32959 [details] jstack info Jmeter hang when testing javasampler with num_threads>6000 , because HashMap.put() from multiple threads. As the following，knowing the thread hang at HashMap.put(); look into the process's jstack info(full content attached)： 2015-08-05 14:48:48 Full thread dump OpenJDK (Taobao) 64-Bit Server VM (20.0-b12-internal mixed mode): "Attach Listener" daemon prio=10 tid=0x00007f078fd5a000 nid=0x4204 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "线??组 1-2788" prio=10 tid=0x00007f07e0111000 nid=0x5fad runnable [0x00007f079d99d000] java.lang.Thread.State: RUNNABLE at java.util.HashMap.put(HashMap.java:374) at java.util.HashSet.add(HashSet.java:200) at org.apache.jmeter.protocol.java.sampler.JavaSampler.createJavaClient(JavaSampler.java:227) at org.apache.jmeter.protocol.java.sampler.JavaSampler.sample(JavaSampler.java:190) at org.apache.jmeter.threads.JMeterThread.process_sampler(JMeterThread.java:431) at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:258) at java.lang.Thread.run(Thread.java:662) "pool-1-thread-1" prio=10 tid=0x00007f0848a90800 nid=0x5c43 waiting on condition [0x00007f07ebca4000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at io.netty.util.HashedWheelTimer$Worker.waitForNextTick(HashedWheelTimer.java:461) at io.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:360) at java.lang.Thread.run(Thread.java:662) "线程组 1-1847" prio=10 tid=0x00007f083c96b800 nid=0x5b54 runnable [0x00007f07f9178000 ...