bipinprasad commented on a change in pull request #3309:
URL: https://github.com/apache/storm/pull/3309#discussion_r480209305



##########
File path: 
storm-server/src/test/java/org/apache/storm/utils/ServerUtilsTest.java
##########
@@ -162,6 +174,163 @@ public void testGetUserId() throws Exception {
         int uid1 = ServerUtils.getUserId(null);
         Path p = Files.createTempFile("testGetUser", ".txt");
         int uid2 = ServerUtils.getPathOwnerUid(p.toString());
+        if (!p.toFile().delete()) {
+            LOG.warn("Could not delete tempoary file {}", p);
+        }
         assertEquals("User UID " + uid1 + " is not same as file " + 
p.toString() + " owner UID of " + uid2, uid1, uid2);
     }
+
+    @Test
+    public void testIsAnyProcessPosixProcessPidDirAlive() throws IOException {
+        final String testName = "testIsAnyProcessPosixProcessPidDirAlive";
+        List<String> errors = new ArrayList<>();
+        int maxPidCnt = 5;
+        if (ServerUtils.IS_ON_WINDOWS) {
+            LOG.info("{}: test cannot be run on Windows. Marked as 
successful", testName);
+            return;
+        }
+        final Path parentDir = Paths.get("/proc");
+        if (!parentDir.toFile().exists()) {
+            LOG.info("{}: test cannot be run on system without process 
directory {}, os.name={}",
+                    testName, parentDir, System.getProperty("os.name"));
+            {
+                // check if we can get process id on this Posix system - 
testing test code, useful on Mac
+                String cmd = "/bin/sleep 10";
+                if (getPidOfPosixProcess(Runtime.getRuntime().exec(cmd), 
errors) < 0) {
+                    fail(String.format("%s: Cannot obtain process id for 
executed command \"%s\"\n%s",
+                            testName, cmd, String.join("\n\t", errors)));
+                }
+            }
+            return;
+        }
+        // Create processes and wait for their termination
+        Set<Long> observables = new HashSet<>();
+
+        for (int i = 0 ; i < maxPidCnt ; i++) {
+            String cmd = "sleep 2000";
+            Process process = Runtime.getRuntime().exec(cmd);
+            long pid = getPidOfPosixProcess(process, errors);
+            LOG.info("{}: ({}) ran process \"{}\" with pid={}", testName, i, 
cmd, pid);
+            if (pid < 0) {
+                String e = String.format("%s: (%d) Cannot obtain process id 
for executed command \"%s\"", testName, i, cmd);
+                errors.add(e);
+                LOG.error(e);
+                continue;
+            }
+            observables.add(pid);
+        }
+        String userName = System.getProperty("user.name");
+        // now kill processes one by one
+        List<Long> pidList = new ArrayList<>(observables);
+        final long processKillIntervalMs = 2000;
+        for (int i = 0 ; i < pidList.size() ; i++) {

Review comment:
       fixed




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