dionusos commented on a change in pull request #64:
URL: https://github.com/apache/oozie/pull/64#discussion_r783248548



##########
File path: 
core/src/test/java/org/apache/oozie/command/wf/TestSignalXCommand.java
##########
@@ -314,4 +322,98 @@ public boolean evaluate() throws Exception {
         assertEquals(prepActions.length, numPrep);
         assertEquals(okActions.length, numOK);
     }
+
+    private void writeToFile(String appXml, String appPath) throws IOException 
{
+        File wf = new File(URI.create(appPath));
+        PrintWriter out = null;
+        try {
+            out = new PrintWriter(new OutputStreamWriter(new 
FileOutputStream(wf), StandardCharsets.UTF_8));
+            out.println(appXml);
+        }
+        catch (IOException iex) {
+            throw iex;
+        }
+        finally {
+            if (out != null) {
+                out.close();
+            }
+        }
+    }
+
+    /**
+     *  This test case is just to test possible dead-lock when
+     *  the conf of oozie.workflow.parallel.fork.action.start
+     *  is enabled.
+     *
+     *  Details could be linked to OOZIE-3646
+     */
+    public void testPossibleDeadLock() throws Exception {
+        setSystemProperty(Services.CONF_SERVICE_EXT_CLASSES, 
ExtendedCallableQueueService.class.getName());
+
+        services = new Services();
+        Configuration servicesConf = services.getConf();
+        servicesConf.set("oozie.service.CallableQueueService.threads", "1");

Review comment:
       Use org.apache.oozie.service.CallableQueueService.CONF_THREADS




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