Adding integration tests for search backpressure #5308

PritLadani · 2022-11-18T19:55:09Z

Description

This commit adds integrations tests to tests that SearchBackpressureService is correctly cancelling the tasks.

Issues Resolved

Check List

New functionality includes testing.
- All tests pass
New functionality has been documented.
- New functionality has javadoc added
Commits are signed per the DCO using --signoff
Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

Signed-off-by: PritLadani pritkladani@gmail.com

Signed-off-by: PritLadani <pritkladani@gmail.com>

github-actions · 2022-11-18T20:27:22Z

Gradle Check (Jenkins) Run Completed with:

RESULT: SUCCESS ✅
URL: https://build.ci.opensearch.org/job/gradle-check/7065/
CommitID: 7c34657

codecov-commenter · 2022-11-18T20:29:57Z

Codecov Report

Merging #5308 (e336a04) into main (7dc137f) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #5308      +/-   ##
============================================
- Coverage     71.03%   71.00%   -0.04%     
- Complexity    58129    58132       +3     
============================================
  Files          4704     4704              
  Lines        277266   277266              
  Branches      40147    40147              
============================================
- Hits         196957   196871      -86     
- Misses        64129    64303     +174     
+ Partials      16180    16092      -88

Impacted Files	Coverage Δ
...adonly/AddIndexBlockClusterStateUpdateRequest.java	`0.00% <0.00%> (-75.00%)`	⬇️
...r/src/main/java/org/opensearch/http/HttpUtils.java	`16.66% <0.00%> (-50.00%)`	⬇️
.../java/org/opensearch/node/NodeClosedException.java	`50.00% <0.00%> (-50.00%)`	⬇️
...opensearch/persistent/PersistentTasksExecutor.java	`22.22% <0.00%> (-44.45%)`	⬇️
...readonly/TransportVerifyShardIndexBlockAction.java	`9.75% <0.00%> (-41.47%)`	⬇️
.../admin/cluster/reroute/ClusterRerouteResponse.java	`60.00% <0.00%> (-40.00%)`	⬇️
...h/action/ingest/SimulateDocumentVerboseResult.java	`60.71% <0.00%> (-39.29%)`	⬇️
...indices/readonly/TransportAddIndexBlockAction.java	`20.68% <0.00%> (-37.94%)`	⬇️
...luster/routing/allocation/RoutingExplanations.java	`62.06% <0.00%> (-37.94%)`	⬇️
...ensearch/client/indices/DetailAnalyzeResponse.java	`20.54% <0.00%> (-34.25%)`	⬇️
... and 475 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

...er/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

reta

This test is unstable, I just run in locally and it passes from 3rd attempt:

./gradlew :server:internalClusterTest --tests "org.opensearch.search.backpressure.SearchBackpressureIT

> Task :server:internalClusterTest                                                                                                                                                                                                                                                                                                                                                          
WARNING: A terminally deprecated method in java.lang.System has been called                                                                                                                                                                                                                                                                                                                 
WARNING: System::setSecurityManager has been called by org.opensearch.bootstrap.BootstrapForTesting (file:/home/andriy.redko/Workspaces/Experiments/OpenSearch/test/framework/build/distributions/framework-3.0.0-SNAPSHOT.jar)                                                                                                                                                             
WARNING: Please consider reporting this to the maintainers of org.opensearch.bootstrap.BootstrapForTesting                                                                                                                                                                                                                                                                                  
WARNING: System::setSecurityManager will be removed in a future release                                                                                                                                                                                                                                                                                                                     
                                                                                                                                                                                                                                                                                                                                                                                            
REPRODUCE WITH: ./gradlew ':server:internalClusterTest' --tests "org.opensearch.search.backpressure.SearchBackpressureIT.testSearchShardTaskCancellationWithHighElapsedTime" -Dtests.seed=899384162E632993 -Dtests.security.manager=true -Dtests.jvm.argline="-XX:TieredStopAtLevel=1 -XX:ReservedCodeCacheSize=64m" -Dtests.locale=es-CR -Dtests.timezone=Etc/Zulu -Druntime.java=19       
                                                                                                                                                                                                                                                                                                                                                                                            
org.opensearch.search.backpressure.SearchBackpressureIT > testSearchShardTaskCancellationWithHighElapsedTime FAILED                                                                                                                                                                                                                                                                         
    java.lang.AssertionError                                                                                                                                                                                                                                                                                                                                                                
        at org.junit.Assert.fail(Assert.java:87)                                                                                                                                                                                                                                                                                                                                            
        at org.junit.Assert.assertTrue(Assert.java:42)                                                                                                                                                                                                                                                                                                                                      
        at org.junit.Assert.assertTrue(Assert.java:53)                                                                                                                                                                                                                                                                                                                                      
        at org.opensearch.search.backpressure.SearchBackpressureIT$1.onFailure(SearchBackpressureIT.java:101)                                                                                                                                                                                                                                                                               
        at org.opensearch.action.support.TransportAction$1.onFailure(TransportAction.java:122)                                                                                                                                                                                                                                                                                              
        at org.opensearch.search.backpressure.SearchBackpressureIT$TestTransportAction.doExecute(SearchBackpressureIT.java:268)                                                                                                                                                                                                                                                             
        at org.opensearch.search.backpressure.SearchBackpressureIT$TestTransportAction.doExecute(SearchBackpressureIT.java:233)                                                                                                                                                                                                                                                             
        at org.opensearch.action.support.TransportAction$RequestFilterChain.proceed(TransportAction.java:218)                                                                                                                                                                                                                                                                               
        at org.opensearch.action.support.TransportAction.execute(TransportAction.java:188)                                                                                                    
        at org.opensearch.action.support.TransportAction.execute(TransportAction.java:107)                                                                                                                                                                                                                                                                                                  
        at org.opensearch.client.node.NodeClient.executeLocally(NodeClient.java:110)                                                                                                                                                                                                                                                                                                        
        at org.opensearch.client.node.NodeClient.doExecute(NodeClient.java:97)                                                                                                                
        at org.opensearch.client.support.AbstractClient.execute(AbstractClient.java:461)                                                                                                                                                                                                                                                                                                    
        at org.opensearch.client.FilterClient.doExecute(FilterClient.java:83)                                                                                                                 
        at org.opensearch.client.support.AbstractClient.execute(AbstractClient.java:461)                                                                                                                                                                                                                                                                                                    
        at org.opensearch.search.backpressure.SearchBackpressureIT.testSearchShardTaskCancellationWithHighElapsedTime(SearchBackpressureIT.java:90)                                                                                                                                                                                                                                         
                                                                                                                                                                                                                                                                                                                                                                                            
    java.lang.AssertionError: test leaves persistent cluster metadata behind                                                                                                                                                                                                                                                                                                                
    Expected: an empty collection                                                                                                                                                                                                                                                                                                                                                           
         but: <[search_backpressure.search_shard_task.elapsed_time_millis_threshold]>                                                                                                                                                                                                                                                                                                       
        at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)

Please make sure the tests suite passes all the time.

...er/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

ketanv3 · 2022-11-20T18:16:17Z

...er/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

+    private TestRequest generateRequestWithHigCpuUsage(double load, long duration) {
+        return new TestRequest(() -> {
+            long startTime = System.currentTimeMillis();
+            try {
+                while (System.currentTimeMillis() - startTime < duration) {
+                    // sleeping for the percentage of unladen time every 100ms
+                    if (System.currentTimeMillis() % 100 == 0) {
+                        Thread.sleep((long) Math.floor((1 - load) * 100));
+                    }
+                }
+            } catch (InterruptedException e) {
+                Thread.currentThread().interrupt();
+            }
+        });
+    }


The same comment applies here as well. We don't really have to simulate an x% CPU load for y seconds.

We just need to execute simple instructions that consume some CPU cycles, and be small enough that it can be interleaved with the cancellation checks. The busy-wait loop already takes care of re-running this 'work' until enough CPU cycles have been consumed for this task cancellation to take place.

...er/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

Signed-off-by: PritLadani <pritkladani@gmail.com>

…ests

...er/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

github-actions · 2022-11-21T12:38:19Z

Gradle Check (Jenkins) Run Completed with:

RESULT: SUCCESS ✅
URL: https://build.ci.opensearch.org/job/gradle-check/7134/
CommitID: ec08b58

github-actions · 2022-11-21T12:43:32Z

Gradle Check (Jenkins) Run Completed with:

RESULT: SUCCESS ✅
URL: https://build.ci.opensearch.org/job/gradle-check/7135/
CommitID: b1d0d32

Signed-off-by: PritLadani <pritkladani@gmail.com>

…/OpenSearch into searchbackpressure/integtests

github-actions · 2022-11-21T15:17:22Z

Gradle Check (Jenkins) Run Completed with:

RESULT: SUCCESS ✅
URL: https://build.ci.opensearch.org/job/gradle-check/7143/
CommitID: b272a12

reta

Looks much better now, thanks @PritLadani

andrross

This test takes about a minute to complete. Is there anyway to make it faster? (our tests are quite slow as it is...)

andrross · 2022-11-21T18:13:42Z

...er/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

+                assertEquals(TaskCancelledException.class, e.getClass());
+                assertTrue(e.getMessage().contains("elapsed time exceeded"));


Putting these assertions in the async callback makes the output on a failure confusing, and also relies on the testing framework to fail on an uncaught exception. This also never counts down the latch in case of failure so await will have to wait until the timeout. It's better to make this callback just capture the exception, e.g.

private static class ExceptionCatchingListener implements ActionListener<TestResponse> { private final CountDownLatch latch = new CountDownLatch(1); private Exception e = null; @Override public void onResponse(TestResponse r) { latch.countDown(); } @Override public void onFailure(Exception e) { this.e = e; latch.countDown(); } }

and then make assertions about e after you've blocked on the latch.

Putting these assertions in the async callback makes the output on a failure confusing, and also relies on the testing framework to fail on an uncaught exception.

Added ExceptionCatchingListener as suggested to handle the exceptions and then asserting on the caught exceptions.

This also never counts down the latch in case of failure so await will have to wait until the timeout.

In case of testcase failure, we are failing the testcase by calling fail() and it will finish the test execution, so CountDownLatch doesn't have to wait until the timeout. In case when testcase passes, we are already decrementing the latch count after assertions.

@andrross Good point regarding test execution time!

@PritLadani May be set ElapsedTimeTracker.SETTING_ELAPSED_TIME_MILLIS_THRESHOLD CpuUsageTracker.SETTING_CPU_TIME_MILLIS_THRESHOLD in the tests to 1 second instead of 15 seconds?

@ketanv3 Sure Ketan, will update the same in the next commit.

In case of testcase failure, we are failing the testcase by calling fail() and it will finish the test execution

fail() doesn't do anything other than throw a AssertionError, so the test doesn't actually fail until the test method completes (after the latch times out) and something in the tear down method of the base class notices the unhandled exception and fails the test case.

With the newly introduced ExceptionCatchingListener, we will not encounter such case where latch has to wait until timeout happens.

andrross · 2022-11-21T18:15:01Z

...er/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

+            }
+        });
+
+        latch.await(TIMEOUT.getSeconds(), TimeUnit.SECONDS);


You should assert that all these await calls return true.

We are having the same timeout value for the request execution as well, and if the TestRequest times out, it will make a call to onResponse() and we already have necessary assertions there.

I realize it is fine now but this is more about maintainability. Future changes may violate some of the current assumptions so it is better to explicitly verify that things are working as expected.

Got it. Asserting on the return value of latch.wait().

github-actions · 2022-11-22T11:16:37Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      2 org.opensearch.index.ShardIndexingPressureConcurrentExecutionTests.testReplicaThreadedUpdateToShardLimitsAndRejections

URL: https://build.ci.opensearch.org/job/gradle-check/7206/
CommitID: cf0beb1
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

github-actions · 2022-11-22T11:22:41Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.index.IndexServiceTests.testAsyncTranslogTrimTaskOnClosedIndex

URL: https://build.ci.opensearch.org/job/gradle-check/7207/
CommitID: 425b577
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

Signed-off-by: PritLadani <pritkladani@gmail.com>

github-actions · 2022-11-22T12:08:13Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.search.aggregations.metrics.TDigestPercentilesIT.testMultiValuedFieldWithValueScriptReverse

URL: https://build.ci.opensearch.org/job/gradle-check/7208/
CommitID: cbeb1e6
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

ketanv3 · 2022-11-22T16:05:43Z

...er/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

+        // Before SearchBackpressureService cancels a task based on its heap usage, we need to build up the heap moving average
+        // To build up the heap moving average, we need to hit the same node with multiple requests and then hit the same node with a
+        // request having higher heap usage
+        String node = internalCluster().startDataOnlyNode();


This will start a new data node for the test. Maybe your intent is to pick up a random node from the existing cluster.

String node = randomFrom(internalCluster().getNodeNames());

Correct. Change it to String node = randomFrom(internalCluster().getNodeNames());.

ketanv3 · 2022-11-22T16:07:11Z

...er/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

+        final int MOVING_AVERAGE_WINDOW_SIZE = 10;
+        Settings request = Settings.builder()
+            .put(SearchBackpressureSettings.SETTING_MODE.getKey(), "enforced")
+            .put(HeapUsageTracker.SETTING_HEAP_PERCENT_THRESHOLD.getKey(), 0.00001)


Should this be zero?

Changed it to zero so that we can be sure that heap threshold is breaching.

Signed-off-by: PritLadani <pritkladani@gmail.com>

github-actions · 2022-11-22T17:08:05Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.snapshots.DedicatedClusterSnapshotRestoreIT.testIndexDeletionDuringSnapshotCreationInQueue

URL: https://build.ci.opensearch.org/job/gradle-check/7220/
CommitID: 16eba20
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

andrross · 2022-11-22T17:02:00Z

...er/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

+        CountDownLatch latch = new CountDownLatch(1);
+        ExceptionCatchingListener listener = new ExceptionCatchingListener(latch);


Nitpick, but you can just create the latch inside ExceptionCatchingListener then access here with listener.latch since the outer class can access private fields of nested classes so you don't even need a getter. Just makes the code a bit more concise.

Makes sense. Changed it.

andrross · 2022-11-22T17:03:35Z

...er/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

+            }
+        });
+
+        latch.await(TIMEOUT.getSeconds(), TimeUnit.SECONDS);


I realize it is fine now but this is more about maintainability. Future changes may violate some of the current assumptions so it is better to explicitly verify that things are working as expected.

andrross · 2022-11-22T17:09:50Z

...er/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

+        assertEquals(TaskCancelledException.class, caughtException.getClass());
+        assertTrue(caughtException.getMessage().contains("cpu usage exceeded"));


Another nitpick but you'll get much better error messages with following style:

MatcherAssert.assertThat(caughtException, instanceOf(TaskCancalledException.class)); MatcherAssert.assertThat(caughtException.getMessage(), containsString("cpu usage exceeded"));

because the error message will show what was found versus what was expected instead of just indicating a failure. Not a big deal though.

Got it. Changed it.

andrross · 2022-11-22T17:18:46Z

...er/src/internalClusterTest/java/org/opensearch/search/backpressure/SearchBackpressureIT.java

+        CountDownLatch latch = new CountDownLatch(1);
+        ExceptionCatchingListener listener = new ExceptionCatchingListener(latch);
+        client().execute(TestTransportAction.ACTION, new TestRequest(RequestType.HIGH_ELAPSED_TIME), listener);
+        latch.await(TIMEOUT.getSeconds(), TimeUnit.SECONDS);


When I run this test this call always returns false and the test takes the entire 30 seconds. Is that expected?

Well, yes. We have set the TIMEOUT to be 30 seconds and it lets the request run for 30 seconds before timing out. We want to be sure that even if the search backpressure thresholds are breads, it is not cancelling the task.

Is there anyway to make that faster? Is it possible to validate that the backpressure threshold is indeed breached?

In this case you should assert that the latch does time out, otherwise the request could successfully complete and the test would still pass.

Signed-off-by: PritLadani <pritkladani@gmail.com>

github-actions · 2022-11-22T19:31:25Z

Gradle Check (Jenkins) Run Completed with:

RESULT: SUCCESS ✅
URL: https://build.ci.opensearch.org/job/gradle-check/7229/
CommitID: e336a04

ketanv3

LGTM!

Signed-off-by: PritLadani <pritkladani@gmail.com> (cherry picked from commit bdb8efe) Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Signed-off-by: PritLadani <pritkladani@gmail.com> (cherry picked from commit bdb8efe) Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com> Signed-off-by: PritLadani <pritkladani@gmail.com> Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com> Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Adding integration tests for search backpressure

7c34657

Signed-off-by: PritLadani <pritkladani@gmail.com>

PritLadani requested review from a team and reta as code owners November 18, 2022 19:55

adnapibar added the skip-changelog label Nov 18, 2022

reta reviewed Nov 18, 2022

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PritLadani and others added 2 commits November 21, 2022 17:37

Addressing PR comments

ec08b58

Signed-off-by: PritLadani <pritkladani@gmail.com>

Merge branch 'opensearch-project:main' into searchbackpressure/integt…

b1d0d32

…ests

ketanv3 suggested changes Nov 21, 2022

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PritLadani added 2 commits November 21, 2022 20:17

Addressing PR comments

09496ef

Signed-off-by: PritLadani <pritkladani@gmail.com>

Merge branch 'searchbackpressure/integtests' of github.com:PritLadani…

b272a12

…/OpenSearch into searchbackpressure/integtests

PritLadani requested a review from reta November 21, 2022 16:24

reta approved these changes Nov 21, 2022

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andrross reviewed Nov 21, 2022

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PritLadani force-pushed the searchbackpressure/integtests branch from cf0beb1 to 425b577 Compare November 22, 2022 10:54

Adding tests for high heap usage

cbeb1e6

Signed-off-by: PritLadani <pritkladani@gmail.com>

PritLadani force-pushed the searchbackpressure/integtests branch from 425b577 to cbeb1e6 Compare November 22, 2022 11:39

PritLadani requested review from andrross and ketanv3 and removed request for andrross November 22, 2022 12:36

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Addressing PR comments

16eba20

Signed-off-by: PritLadani <pritkladani@gmail.com>

PritLadani requested review from ketanv3 and andrross and removed request for ketanv3 November 22, 2022 16:42

andrross reviewed Nov 22, 2022

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Adding assertion on latch.await()

e336a04

Signed-off-by: PritLadani <pritkladani@gmail.com>

PritLadani requested a review from andrross November 22, 2022 19:03

andrross approved these changes Nov 22, 2022

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ketanv3 approved these changes Nov 22, 2022

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andrross merged commit bdb8efe into opensearch-project:main Nov 22, 2022

andrross added the backport 2.x Backport to 2.x branch label Nov 22, 2022

opensearch-trigger-bot bot mentioned this pull request Nov 22, 2022

[Backport 2.x] Adding integration tests for search backpressure #5343

Merged

		assertEquals(TaskCancelledException.class, e.getClass());
		assertTrue(e.getMessage().contains("elapsed time exceeded"));

		CountDownLatch latch = new CountDownLatch(1);
		ExceptionCatchingListener listener = new ExceptionCatchingListener(latch);

		assertEquals(TaskCancelledException.class, caughtException.getClass());
		assertTrue(caughtException.getMessage().contains("cpu usage exceeded"));

Adding integration tests for search backpressure #5308

Adding integration tests for search backpressure #5308

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