GEODE-10155: Avoid threads hanging when function execution times-out #7493

albertogpz · 2022-03-25T20:29:22Z

For all changes:

Is there a JIRA ticket associated with this PR? Is it referenced in the commit message?
Has your PR been rebased against the latest commit within the target branch (typically develop)?
Is your initial contribution a single, squashed commit?
Does gradlew build run cleanly?
Have you written or updated unit tests to verify your changes?
If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?

boglesby

I'm still reviewing this, but here are a few small comments.

boglesby · 2022-04-06T01:00:53Z

...src/distributedTest/java/org/apache/geode/internal/cache/execute/PRClientServerTestBase.java

+          .setPRSingleHopEnabled(false);
+      if (connectTimeout > 0) {
+        factory.setSocketConnectTimeout(connectTimeout);
+      }


setConnectionTimeout is already being done right above this, so this check isn't necessary.

boglesby · 2022-04-06T01:01:33Z

...src/distributedTest/java/org/apache/geode/internal/cache/execute/PRClientServerTestBase.java

+      PoolFactory factory = PoolManager.createFactory().addServer(host, port1)
+          .addServer(host, port2).addServer(host, port3).setPingInterval(2000)
+          .setSubscriptionEnabled(true).setSubscriptionRedundancy(-1).setReadTimeout(2000)
+          .setSocketBufferSize(1000).setRetryAttempts(0)


You don't need subscriptions in this test.

boglesby · 2022-04-06T01:02:47Z

geode-dunit/src/main/java/org/apache/geode/internal/cache/functions/TestFunction.java

+      try {
+        Thread.sleep(waitBetweenEntriesMs);
+      } catch (InterruptedException e) {
+        e.printStackTrace();


I see other methods in this class are calling printStackTrace, but I'm not sure thats the best behavior here.

boglesby · 2022-04-06T01:03:24Z

geode-dunit/src/main/java/org/apache/geode/internal/cache/functions/TestFunction.java

+    if (getId().equals(TEST_FUNCTION_SLOW)) {
+      return false;
+    }
+


This check can be moved down to the code below in the method like:

if (getId().equals(TEST_FUNCTION_NONHA_SERVER) || getId().equals(TEST_FUNCTION_NONHA_REGION) || getId().equals(TEST_FUNCTION_NONHA_NOP) || getId().equals(TEST_FUNCTION_NONHA) || getId().equals(TEST_FUNCTION_SLOW)) { return false; }

jake-at-work · 2022-04-12T22:29:26Z

.../java/org/apache/geode/internal/cache/execute/PartitionedRegionFunctionResultSenderTest.java

+
+import java.util.concurrent.TimeUnit;
+
+import org.junit.Test;


Use Junit 5.

jake-at-work · 2022-04-12T22:30:07Z

.../java/org/apache/geode/internal/cache/execute/PartitionedRegionFunctionResultSenderTest.java

+
+  @Test
+  public void whenResponseToClientInLastResultFailsEndResultsIsCalled_OnlyLocal_NotOnlyRemote() {
+    // arrange


These comments aren't adding to the readability, please remove them.

jake-at-work · 2022-04-12T22:31:11Z

.../java/org/apache/geode/internal/cache/execute/PartitionedRegionFunctionResultSenderTest.java

+  @Test
+  public void whenResponseToClientInLastResultFailsEndResultsIsCalled_NotOnlyLocal_NotOnlyRemote() {
+    // arrange
+    Mockito.doThrow(new FunctionException()).when(serverToClientFunctionResultSender)


Static import the Mockito and AssertJ builder methods.

kirklund · 2022-04-25T16:24:52Z

...src/distributedTest/java/org/apache/geode/internal/cache/execute/PRClientServerTestBase.java

+    Integer port1 = server1.invoke(() -> PRClientServerTestBase
+        .createCacheServer(commonAttributes, localMaxMemoryServer1, maxThreads));
+    Integer port2 = server2.invoke(() -> PRClientServerTestBase
+        .createCacheServer(commonAttributes, localMaxMemoryServer2, maxThreads));
+    Integer port3 = server3.invoke(() -> PRClientServerTestBase
+        .createCacheServer(commonAttributes, localMaxMemoryServer3, maxThreads));
+    client.invoke(() -> PRClientServerTestBase.createNoSingleHopCacheClient(
+        NetworkUtils.getServerHostName(server1.getHost()), port1, port2, port3, connectTimeout));


A few minor nitpicks here (comment only):

Change those Integer vars to int and prefer primitives to wrapper types if possible.

I recommend using String hostname instance fields instead inlining those getServerHostName and getHost calls in the RMI lambdas. Some of them misbehave when called in the dunit ChildVMs so this avoids all issues.

@kirklund Are you ok with the changes I made after your review? Anything left?

kirklund · 2022-04-25T16:27:52Z

.../java/org/apache/geode/internal/cache/execute/PartitionedRegionFunctionResultSenderTest.java

+    try {
+      sender.lastResult(new FunctionException());
+    } catch (FunctionException expected) {
+    }


You should always add assertions for expected exceptions:

Throwable thrown = catchThrowable(() -> { sender.lastResult(new FunctionException()); } assertThat(thrown) .isInstanceOf(FunctionException.class) .(any other assertions that are valuable?)

I did not add the assertion because it was not something I wanted to verify in the test. Nevertheless, thanks to your comment I have seen that the exception is not thrown so I have removed it.
I have also changed the test cases so that instead of sending an exception, an object is sent.

kirklund · 2022-04-25T16:28:18Z

.../java/org/apache/geode/internal/cache/execute/PartitionedRegionFunctionResultSenderTest.java

+    try {
+      sender.lastResult(new FunctionException(), true, rc, null);
+    } catch (FunctionException expected) {
+    }


Another expected exception that needs assertion(s).

kirklund · 2022-04-25T16:28:24Z

.../java/org/apache/geode/internal/cache/execute/PartitionedRegionFunctionResultSenderTest.java

+    try {
+      sender.lastResult(new FunctionException(), true, rc, null);
+    } catch (FunctionException expected) {
+    }


Another expected exception that needs assertion(s).

kirklund · 2022-04-25T16:28:31Z

.../java/org/apache/geode/internal/cache/execute/PartitionedRegionFunctionResultSenderTest.java

+    try {
+      sender.sendResult(new FunctionException());
+    } catch (FunctionException expected) {
+    }


Another expected exception that needs assertion(s).

kirklund · 2022-04-25T16:28:42Z

.../java/org/apache/geode/internal/cache/execute/PartitionedRegionFunctionResultSenderTest.java

+    try {
+      sender.sendResult(new FunctionException());
+    } catch (FunctionException expected) {
+    }


Another expected exception that needs assertion(s).

kirklund · 2022-04-25T16:28:48Z

.../java/org/apache/geode/internal/cache/execute/PartitionedRegionFunctionResultSenderTest.java

+    try {
+      sender.sendResult(new FunctionException());
+    } catch (FunctionException expected) {
+    }


Another expected exception that needs assertion(s).

kirklund · 2022-04-25T16:30:33Z

.../java/org/apache/geode/internal/cache/execute/PartitionedRegionFunctionResultSenderTest.java

+
+  @Test
+  public void whenResponseToClientInLastResultFailsEndResultsIsCalled_OnlyLocal_NotOnlyRemote() {
+    doThrow(new FunctionException()).when(serverToClientFunctionResultSender)


I recommend either using a cause like new FunctionException(new CauseException("for test") and then include the cause and cause message in the assertions or at least use a custom message like new FunctionException("for test").

Thanks for the comment. It is not applicable anymore due to the changes described in a previous comment.

jake-at-work · 2022-04-25T16:41:36Z

.../geode/internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDUnitTest.java

+   * request will never be served because there would be not ServerConnection
+   * threads available and the test case will time-out.
+   */
+  @Test


Please rename test to current convention, PRClientServerRegionFunctionExecutionNoSingleHopDistributedTest.

jake-at-work · 2022-04-25T16:42:47Z

...src/distributedTest/java/org/apache/geode/internal/cache/execute/PRClientServerTestBase.java

+    factory.setScope(Scope.LOCAL);
+    factory.setDataPolicy(DataPolicy.EMPTY);
+    factory.setPoolName(p.getName());
+    RegionAttributes attrs = factory.create();


Please don't introduce more raw type usage. Preferably clean up all other raw types in existing test.

jake-at-work · 2022-04-25T16:45:32Z

...main/java/org/apache/geode/internal/cache/execute/PartitionedRegionFunctionResultSender.java

+    this(dm, pr, time, msg, function, bucketArray,
+        (x, y) -> FunctionStatsManager.getFunctionStats((String) x, (InternalDistributedSystem) y));
+  }
+
  /**
   * Have to combine next two constructor in one and make a new class which will send Results back.
   *
   */
  public PartitionedRegionFunctionResultSender(DistributionManager dm, PartitionedRegion pr,


If this new constructor is used only testing it should be package private. Evaluate access level on each of these constructors.

jake-at-work · 2022-04-25T16:47:41Z

...main/java/org/apache/geode/internal/cache/execute/PartitionedRegionFunctionResultSender.java

    this.msg = msg;
    this.dm = dm;
    this.pr = pr;
    this.time = time;
    this.function = function;
    this.bucketArray = bucketArray;
-
+    this.functionStatsFunctionProvider = functionStatsFunctionProvider;


Have all overloaded constructs call a single initializing constructor.

mhansonp

Please ensure to leave the code better than you found it (reduced warnings). Please work to not introduce new warnings to the code.

mhansonp · 2022-04-26T16:48:54Z

.../geode/internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDUnitTest.java

+    // executions.
+    await().until(() -> {
+      client.invoke(() -> executeGet(PartitionedRegionName, "key"));
+      return true;


Should the return be in this block?

Do you want to set a specific amount of time for the await here based on the idea that you have an expectation of time?

Should the return be in this block?
Yes, it is needed as the method should return a boolean.

Do you want to set a specific amount of time for the await here based on the idea that you have an expectation of time?
Not really. I am just checking that it did not hang forever.

Could the return have been outside of the await? That is what I was getting at once the await finishes, the return could be called.

If you remove the return you get a compilation error.
The idea is to test that the call previous to the return does not hang.
Do you have a better way to achieve it?

mhansonp · 2022-04-26T16:49:28Z

.../geode/internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDUnitTest.java

+  private Object executeSlowFunctionOnRegionNoFilter(Function function, String regionName,
+      int functionTimeoutSecs) {
+    FunctionService.registerFunction(function);
+    Region region = cache.getRegion(regionName);


Wildcard added.

mhansonp · 2022-04-26T16:51:40Z

.../geode/internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDUnitTest.java

+    return region.get(key);
+  }
+
+  private Object executeSlowFunctionOnRegionNoFilter(Function function, String regionName,


Can you provide a type for Function?

Added wildcard.

mhansonp · 2022-04-26T16:52:23Z

.../geode/internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDUnitTest.java

+    FunctionService.registerFunction(function);
+    Region region = cache.getRegion(regionName);
+
+    Execution execution = FunctionService.onRegion(region);


Typing? Execution<IN, OUT, AGG>

Oh, function execution types are a mess. Best to just walk away.

mhansonp · 2022-04-26T16:55:09Z

...src/distributedTest/java/org/apache/geode/internal/cache/execute/PRClientServerTestBase.java

+      CacheServerTestUtil.enableShufflingOfEndpoints();
+    }
+    pool = (PoolImpl) p;
+    AttributesFactory factory = new AttributesFactory();


AttributesFactory<Object, Object> factory = new AttributesFactory<>(); ?

RegionAttributes<Object, Object> attrs ?

The least common base type?

If you look at what is being put in the region, it varies. I prefer Object to ?, but I will defer to your opinion.

If you aren't calling any of the methods on this instance that have matching typed parameters then you can get away with ? but as soon as you try to invoke one with a value that does match type ? it will fail to compile. Java! Better type templating is coming...
My general rule is use ? when you don't care or know the type, use per-method generics when the type matters but is not know, use Object when the type matters and it doesn't have any other common ancestor or we don't know all the possible types.

mhansonp · 2022-04-26T18:58:10Z

...src/distributedTest/java/org/apache/geode/internal/cache/execute/PRClientServerTestBase.java

@@ -99,10 +101,11 @@ public final void postSetUp() throws Exception {
    server2 = host.getVM(1);
    server3 = host.getVM(2);


For future reference, these can be cleaned up to be
Host host = Host.getHost(0);
server1 = VM.getVM(0);
server2 = VM.getVM(1);
server3 = VM.getVM(2);
client = VM.getVM(3);

mhansonp · 2022-04-26T18:58:55Z

...src/distributedTest/java/org/apache/geode/internal/cache/execute/PRClientServerTestBase.java

    return createCacheServer(commonAttributes, localMaxMemory, -1);
  }

-  public static Integer createCacheServer(ArrayList commonAttributes, Integer localMaxMemory,
+  public static Integer createCacheServer(ArrayList<?> commonAttributes, Integer localMaxMemory,


commonAttributes is of type Object

mhansonp · 2022-04-26T18:59:25Z

...src/distributedTest/java/org/apache/geode/internal/cache/execute/PRClientServerTestBase.java

@@ -120,7 +123,8 @@ protected boolean shouldRegisterFunctionsOnClient() {
    return ExecuteFunctionMethod.ExecuteFunctionByObject == functionExecutionType;
  }

-  ArrayList createCommonServerAttributes(String regionName, PartitionResolver pr, int red,
+  ArrayList<Object> createCommonServerAttributes(String regionName, PartitionResolver<?, ?> pr,


As seen here createCommonServerAttributes returns ArrayList

mhansonp · 2022-04-26T18:59:36Z

...src/distributedTest/java/org/apache/geode/internal/cache/execute/PRClientServerTestBase.java

@@ -131,26 +135,26 @@ ArrayList createCommonServerAttributes(String regionName, PartitionResolver pr,
    return commonAttributes;
  }

-  public static Integer createCacheServer(ArrayList commonAttributes, Integer localMaxMemory) {
+  public static Integer createCacheServer(ArrayList<?> commonAttributes, Integer localMaxMemory) {


commonAttributes is of type Object

mhansonp · 2022-04-26T19:02:49Z

...src/distributedTest/java/org/apache/geode/internal/cache/execute/PRClientServerTestBase.java

@@ -273,12 +259,12 @@ public static void createCacheClient(String host, Integer port1, Integer port2,
    factory.setScope(Scope.LOCAL);
    factory.setDataPolicy(DataPolicy.EMPTY);
    factory.setPoolName(p.getName());
-    RegionAttributes attrs = factory.create();
-    Region region = cache.createRegion(PartitionedRegionName, attrs);
+    RegionAttributes<?, ?> attrs = factory.create();


We could use Object, Object instead of ?,? because we only Objects(String, Integer, Boolean) in region.

mhansonp · 2022-04-26T19:19:37Z

If you take a look at #7608 you can see the level of cleanup we are hoping for.

jake-at-work

This is a great step in the right direction for cleaning up the tests. I would ask that after you apply the conversions you check the results. If you used the Assertions2AssertJ plugin, or similar, it misses some things, especially around collection assertions.
Please use variations of the hasSize() and contains() assertions.

.../internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDistributedTest.java

jake-at-work · 2022-04-27T13:26:46Z

.../internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDistributedTest.java

+    }
+    ResultCollector<?, ?> rc1 = executeOnAll(dataSet, Boolean.TRUE, function, isByName);
+    List<?> resultList = (List<?>) rc1.getResult();
+    logger.info("Result size : " + resultList.size());


Let's avoid adding more logging to tests. If it is worth logging it is worth asserting and you don't need both.

.../internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDistributedTest.java

jake-at-work

I am going to approve now but would prefer you take a bit more cleanup before merging.

mhansonp

Looks good, I only saw two problems of real concern what should probably be awaitility awaits rather than wait.pause followed by assertThat...

mhansonp · 2022-05-12T22:16:51Z

.../internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDistributedTest.java

    }
+    Map<String, Integer> resultMap = region.getAll(testKeysList);
+    assertThat(resultMap).containsExactlyInAnyOrderEntriesOf(origVals);
+    Wait.pause(2000);


why not use awaitility here? using a pause is dangerous.

mhansonp · 2022-05-12T22:17:14Z

.../internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDistributedTest.java

    }
+    Map<String, Integer> resultMap = region.getAll(testKeysList);
+    assertThat(resultMap).containsExactlyInAnyOrderEntriesOf(origVals);


mhansonp · 2022-05-12T22:18:39Z

.../internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDistributedTest.java

+      FunctionService.registerFunction(function);
+      Execution dataSet = FunctionService.onRegion(region);
+      ResultCollector<?, ?> rc1 = execute(dataSet, singleKeySet, Boolean.TRUE, function, isByName);
+      List<?> l = (List<?>) rc1.getResult();


not your fault, but single letter variable names are not great.

mhansonp · 2022-05-12T22:19:34Z

.../internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDistributedTest.java

+    List<?> l = (List<?>) rc1.getResult();
+    assertThat(l).hasSize(3);
+    for (Object item : l) {
+      assertThat(item).isEqualTo(Boolean.TRUE);


I think "true" works instead of "Boolean.TRUE"

mhansonp · 2022-05-12T22:22:06Z

.../internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDistributedTest.java

+      List<?> subL = (List<?>) value;
+      assertThat(subL).hasSizeGreaterThan(0);
+      for (Object o : subL) {
+        assertThat(foundVals.add((Integer) o)).isTrue();


Can you fix the typing of the generics to avoid casting? subL is as List

Not necessary though...

Not sure I get what you are exactly proposing here.

mhansonp · 2022-05-12T22:22:47Z

.../internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDistributedTest.java

+        dataSet.withFilter(testKeysSet).setArguments(Boolean.TRUE).execute(new FunctionAdapter() {
+          @Override
+          public void execute(FunctionContext context) {
+            @SuppressWarnings("unchecked")


is this still necessary?

Yes, it is.

mhansonp · 2022-05-12T22:24:37Z

.../internal/cache/execute/PRClientServerRegionFunctionExecutionNoSingleHopDistributedTest.java

+          }
+        });
+    List<?> l = (List<?>) rc1.getResult();
+    logger.info("Result size : " + l.size());


Naming and typing, not your fault, but could you improve it?

mhansonp · 2022-05-12T22:28:52Z

There is a lot of technical debt in this file. Good job cleaning a lot up. It all helps.

boglesby

Can you change the JIRA to say that isHA has to be false for this behavior to exist.

albertogpz · 2022-05-25T07:01:07Z

Can you change the JIRA to say that isHA has to be false for this behavior to exist.

Done. Thanks!

…7493) * GEODE-10155: Avoid threads hanging when function execution times-out * GEODE-10155: Updated after review * GEODE-10155: More changes after review * GEODE-10155: Changes after more reviews * GEODE-10155: Some more changes after review * GEODE-10155: More changes after review * GEODE-10155: More clean-up after review

albertogpz force-pushed the feature/GEODE-10155 branch from 8f7c546 to 6463aaf Compare March 28, 2022 09:54

albertogpz marked this pull request as ready for review March 28, 2022 12:25

albertogpz requested review from mhansonp, kirklund, boglesby and nabarunnag as code owners March 28, 2022 12:25

albertogpz force-pushed the feature/GEODE-10155 branch 2 times, most recently from eafb2bc to bb5e95d Compare March 28, 2022 16:11

boglesby reviewed Apr 6, 2022

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albertogpz requested a review from jake-at-work as a code owner April 8, 2022 08:39

jake-at-work requested changes Apr 12, 2022

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albertogpz requested review from boglesby and jake-at-work April 21, 2022 11:44

jake-at-work approved these changes Apr 21, 2022

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kirklund reviewed Apr 25, 2022

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albertogpz force-pushed the feature/GEODE-10155 branch from 99a0ce7 to dbd9953 Compare April 27, 2022 16:05

albertogpz requested review from mhansonp and kirklund April 28, 2022 07:00

mhansonp approved these changes May 12, 2022

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albertogpz force-pushed the feature/GEODE-10155 branch 2 times, most recently from 55cae14 to 62cb006 Compare May 19, 2022 11:17

albertogpz added 7 commits May 23, 2022 18:26

GEODE-10155: Avoid threads hanging when function execution times-out

7e7404e

GEODE-10155: Updated after review

ba259eb

GEODE-10155: More changes after review

a0fc0bb

GEODE-10155: Changes after more reviews

4fce019

GEODE-10155: Some more changes after review

413b284

GEODE-10155: More changes after review

8081382

GEODE-10155: More clean-up after review

7d1defd

albertogpz force-pushed the feature/GEODE-10155 branch from 62cb006 to 7d1defd Compare May 23, 2022 16:26

albertogpz requested a review from demery-pivotal as a code owner May 23, 2022 16:26

demery-pivotal approved these changes May 23, 2022

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boglesby approved these changes May 24, 2022

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kirklund approved these changes Jun 6, 2022

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albertogpz merged commit 7ccdc82 into apache:develop Jun 6, 2022

albertogpz deleted the feature/GEODE-10155 branch June 6, 2022 18:18

		@@ -99,10 +101,11 @@ public final void postSetUp() throws Exception {
		server2 = host.getVM(1);
		server3 = host.getVM(2);

GEODE-10155: Avoid threads hanging when function execution times-out #7493

GEODE-10155: Avoid threads hanging when function execution times-out #7493

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albertogpz commented Mar 25, 2022

For all changes:

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mhansonp commented Apr 26, 2022

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mhansonp commented May 12, 2022

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albertogpz commented May 25, 2022