issue-557 added automatically span creation for DispatcherTypes: FORWARD, INCLUDE, ERROR by videnkz · Pull Request #1212 · elastic/apm-agent-java

videnkz · 2020-06-01T18:47:37Z

closes #557
reopened from #557

closes #384

ghost · 2020-06-01T20:05:02Z

💚 Build Succeeded

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Build stats

Build Cause: [Pull request #1212 updated]
Start Time: 2020-08-21T14:32:27.600+0000
Duration: 46 min 52 sec

Test stats 🧪

Test	Results
Failed	0
Passed	1464
Skipped	11
Total	1475

videnkz · 2020-06-02T06:16:42Z

ebsphere] 2020-06-02 05:53:49,984 [elastic-apm-circuit-breaker] INFO  co.elastic.apm.agent.impl.circuitbreaker.CircuitBreaker - Stopping the Circuit Breaker thread.
[websphere] 2020-06-02 05:53:49,984 [Framework stop] DEBUG co.elastic.apm.agent.bci.ElasticApmAgent - Type match for instrumentation ExecutorRunnableInstrumentation: ((((hasSuperType(erasure(name(equals(java.util.concurrent.Executor)))) and not(name(equals(org.apache.felix.resolver.ResolverImpl$DumbExecutor)))) and not(name(startsWith(com.hazelcast)))) and not((name(contains($Proxy)) or name(contains($$))))) and not(isInterface())) matches class java.util.concurrent.ForkJoinPool
[websphere] 2020-06-02 05:53:49,985 [Framework stop] DEBUG co.elastic.apm.agent.bci.ElasticApmAgent - Type match for instrumentation ExecutorCallableInstrumentation: ((((hasSuperType(erasure(name(equals(java.util.concurrent.Executor)))) and not(name(equals(org.apache.felix.resolver.ResolverImpl$DumbExecutor)))) and not(name(startsWith(com.hazelcast)))) and not((name(contains($Proxy)) or name(contains($$))))) and not(isInterface())) matches class java.util.concurrent.ForkJoinPool
[websphere] [AUDIT   ] CWWKT0017I: Web application removed (default_host): https://08df9efac3d5:9443/simple-webapp/
[websphere] [AUDIT   ] CWWKT0017I: Web application removed (default_host): https://08df9efac3d5:9443/cdi-app/
[websphere] [AUDIT   ] CWWKT0017I: Web application removed (default_host): https://08df9efac3d5:9443/jsf-http-get/
[websphere] 2020-06-02 05:53:50,033 [Framework stop] DEBUG co.elastic.apm.agent.bci.ElasticApmAgent - Method match for instrumentation ExecutorRunnableInstrumentation: ((((name(equals(execute)) and returns(erasure(is(void)))) and hasParameter(hasTypes(erasures(containing(is(interface java.lang.Runnable)))))) or ((name(equals(submit)) and returns(erasure(is(interface java.util.concurrent.Future)))) and hasParameter(hasTypes(erasures(containing(is(interface java.lang.Runnable))))))) or ((name(equals(submit)) and returns(erasure(is(interface java.util.concurrent.Future)))) and hasParameter(hasTypes(erasures(containing(is(interface java.lang.Runnable), is(class java.lang.Object))))))) matches public void java.util.concurrent.ForkJoinPool.execute(java.lang.Runnable)
[websphere] [AUDIT   ] CWWKZ0009I: The application simple-webapp has stopped successfully.
[websphere] [AUDIT   ] CWWKZ0009I: The application cdi-app has stopped successfully.
[websphere] [AUDIT   ] CWWKZ0009I: The application jsf-http-get has stopped successfully.
[websphere] [AUDIT   ] CWWKE0036I: The server defaultServer stopped after 15.941 seconds.
Tests run: 2, Failures: 2, Errors: 0, Skipped: 0, Time elapsed: 53.62 sec <<< FAILURE! - in co.elastic.apm.servlet.WebSphereIT
testAllScenarios[WebSphere 8.5.5](co.elastic.apm.servlet.WebSphereIT)  Time elapsed: 15.743 sec  <<< FAILURE!
org.opentest4j.AssertionFailedError: 

Expecting:
 <5>
to be equal to:
 <2>
but was not.

testAllScenarios[WebSphere webProfile7](co.elastic.apm.servlet.WebSphereIT)  Time elapsed: 9.87 sec  <<< FAILURE!
org.opentest4j.AssertionFailedError: 

Expecting:
 <3>
to be equal to:
 <2>
but was not.


Results :

Failed tests: 
  JBossIT>AbstractServletContainerIntegrationTest.testAllScenarios:264 
Expecting:
 <3>
to be equal to:
 <2>
but was not.
  TomcatIT>AbstractServletContainerIntegrationTest.testAllScenarios:264 
Expecting:
 <4>
to be equal to:
 <2>
but was not.
  TomcatIT>AbstractServletContainerIntegrationTest.testAllScenarios:264 
Expecting:
 <4>
to be equal to:
 <2>
but was not.
  TomcatIT>AbstractServletContainerIntegrationTest.testAllScenarios:264 
Expecting:
 <4>
to be equal to:
 <2>
but was not.
  TomcatIT>AbstractServletContainerIntegrationTest.testAllScenarios:264 
Expecting:
 <4>
to be equal to:
 <2>
but was not.
  TomcatIT>AbstractServletContainerIntegrationTest.testAllScenarios:264 
Expecting:
 <4>
to be equal to:
 <2>
but was not.
  TomcatIT>AbstractServletContainerIntegrationTest.testAllScenarios:264 
Expecting:
 <4>
to be equal to:
 <2>
but was not.
  WebSphereIT>AbstractServletContainerIntegrationTest.testAllScenarios:264 
Expecting:
 <5>
to be equal to:
 <2>
but was not.
  WebSphereIT>AbstractServletContainerIntegrationTest.testAllScenarios:264 
Expecting:
 <3>
to be equal to:
 <2>
but was not.

Tests run: 28, Failures: 9, Errors: 0, Skipped: 1

videnkz · 2020-06-02T10:51:16Z

with last fix, now I have problem with ServletApiTestApp#testTransactionReportingWithErrorHandling
It fails only on WebsphereIT(webProfile7).
Transaction by some reason not created.

videnkz · 2020-06-02T11:18:00Z

@felixbarny, I noticed that for some Jetty application container span of DispatcherType.ERROR created, but for example websphere, widlfy, tomcat - not.

videnkz · 2020-06-03T05:36:59Z

when we call "/simple-webapp" + "/unknown" inServletApiTestApp#testTransactionReportingWithErrorHandling
JettyIT(9.3) fails with error:

ailed tests: 
  JettyIT>AbstractServletContainerIntegrationTest.testAllScenarios:264->AbstractServletContainerIntegrationTest.assertTransactionReported:273->AbstractServletContainerIntegrationTest.getAllReported:338->AbstractServletContainerIntegrationTest.getReportedTransactions:414->AbstractServletContainerIntegrationTest.getEvents:452->AbstractServletContainerIntegrationTest.validateEventMetadata:475->AbstractServletContainerIntegrationTest.validateServiceName:492 [Event has non-expected service name {"timestamp":1591161440603002,"name":"DefaultServlet#doGet","id":"7c4a6aab6a74eda3","trace_id":"191fdaf7ed5f2d2d6876d647b6402b22","type":"request","duration":18.712,"result":"HTTP 4xx","context":{"service":{"name":"Simple Web App"},"request":{"method":"GET","headers":{"Connection":"keep-alive","User-Agent":"okhttp/3.9.1","Host":"localhost:33485","Accept-Encoding":"gzip"},"url":{"full":"http://localhost:33485/simple-webapp/unknown","hostname":"localhost","port":"33485","pathname":"/simple-webapp/unknown","protocol":"http"},"socket":{"encrypted":false,"remote_address":"172.30.0.1"},"http_version":"1.1"},"response":{"finished":true,"headers_sent":true,"status_code":404},"tags":{}},"span_count":{"dropped":0,"started":1},"sampled":true}] 
Expecting:
 <"Simple Web App">
to be equal to:
 <"jsf-http-get">
but was not.
  JettyIT>AbstractServletContainerIntegrationTest.testAllScenarios:264->AbstractServletContainerIntegrationTest.assertTransactionReported:273->AbstractServletContainerIntegrationTest.getAllReported:338->AbstractServletContainerIntegrationTest.getReportedTransactions:414->AbstractServletContainerIntegrationTest.getEvents:452->AbstractServletContainerIntegrationTest.validateEventMetadata:475->AbstractServletContainerIntegrationTest.validateServiceName:492 [Event has non-expected service name {"timestamp":1591161454235002,"name":"DefaultServlet#doGet","id":"a3575d7702a7837d","trace_id":"965887bd126bd2e4e429bf74db52d090","type":"request","duration":16.391,"result":"HTTP 4xx","context":{"service":{"name":"Simple Web App"},"request":{"method":"GET","headers":{"Connection":"keep-alive","User-Agent":"okhttp/3.9.1","Host":"localhost:33486","Accept-Encoding":"gzip"},"url":{"full":"http://localhost:33486/simple-webapp/unknown","hostname":"localhost","port":"33486","pathname":"/simple-webapp/unknown","protocol":"http"},"socket":{"encrypted":false,"remote_address":"172.30.0.1"},"http_version":"1.1"},"response":{"finished":true,"headers_sent":true,"status_code":404},"tags":{}},"span_count":{"dropped":0,"started":1},"sampled":true}] 
Expecting:
 <"Simple Web App">
to be equal to:
 <"jsf-http-get">
but was not.

felixbarny · 2020-06-10T12:37:02Z

Sometimes spans from one test can leak to another test. Not sure what the best solution for that is. Maybe to make sure to wait until all expected spans have arrived in each test so that they can't leak into others.

eyalkoren

Awesome job!
Please see the few comments.
Thanks!

eyalkoren · 2020-06-18T14:45:38Z

...-plugins/apm-servlet-plugin/src/main/java/co/elastic/apm/agent/servlet/ServletApiAdvice.java

+                String spanAction = null, spanName = null;
+                if (dispatcherType == DispatcherType.FORWARD) {
+                    String pathInfo = request.getPathInfo();
+                    spanName = FORWARD + SPACE + request.getServletPath() + (pathInfo != null ? pathInfo : EMPTY);


This is allocating four String objects every time. Please use the AbstractSpan#appendToName() API instead (create it before).
Same for the other ones.

repalced with appendToName

eyalkoren · 2020-06-18T14:56:27Z

...-plugins/apm-servlet-plugin/src/main/java/co/elastic/apm/agent/servlet/ServletApiAdvice.java

            servletTransactionHelper.fillRequestContext(transaction, request.getProtocol(), request.getMethod(), request.isSecure(),
                request.getScheme(), request.getServerName(), request.getServerPort(), request.getRequestURI(), request.getQueryString(),
                request.getRemoteAddr(), request.getHeader("Content-Type"));
+        } else if (transaction == null && servletRequest instanceof HttpServletRequest) {


This else statement looks misplaced. Its content should go inside the if above and you can do else with the servletRequest.getDispatcherType() == DispatcherType.REQUEST check.

eyalkoren · 2020-06-18T15:06:55Z

...-plugins/apm-servlet-plugin/src/main/java/co/elastic/apm/agent/servlet/ServletApiAdvice.java

+                    spanAction = INCLUDE_SPAN_ACTION;
+                    isAllowedType = true;
+                } else if (dispatcherType == DispatcherType.ERROR) {
+                    spanName = ERROR + SPACE + request.getAttribute(RequestDispatcher.FORWARD_SERVLET_PATH);


Why using RequestDispatcher.FORWARD_SERVLET_PATH in this case? I think we want the error page path. The transaction will contain the original servlet path.

changed to getting

Object servletPath = request.getServletPath();

eyalkoren · 2020-06-18T15:10:09Z

...-plugins/apm-servlet-plugin/src/main/java/co/elastic/apm/agent/servlet/ServletApiAdvice.java

+                } else if (dispatcherType == DispatcherType.ERROR) {
+                    spanName = ERROR + SPACE + request.getAttribute(RequestDispatcher.FORWARD_SERVLET_PATH);
+                    spanAction = ERROR_SPAN_ACTION;
+                    isAllowedType = true;


Please check if you already get the Exception object stored in the RequestDispatcher.ERROR_EXCEPTION attribute somewhere else. If not, let's create and send an error here with captureException through the parent span.

eyalkoren · 2020-06-18T15:25:21Z

...n-server-integration-tests/src/test/java/co/elastic/apm/servlet/tests/ServletApiTestApp.java

+        for (JsonNode span : test.getReportedSpans()) {
+            String spanType = span.get("type").textValue();
+            if ("servlet.request-dispatcher.forward".equals(spanType)) {
+                isExistForwardSpan = true;
+                assertThat(span.get("name").textValue()).isEqualTo("FORWARD /servlet");
+            } else if ("db.h2.query".equals(spanType)) {
+                isExistDbH2QuerySpan = true;
+            }
+        }


You need to assert that exactly the expected spans are captured. Potentially, this can pass if two non-related spans are captured.
You can filter the span collection for each and assert you get exactly one that contains the required info.

added filter before assert.

eyalkoren

Thanks for working on that.
I suggest you first merge with master. You will see quite a few changes in the related code.
Then, see if you can apply the requested changes.
Let us know if you need assistance with that.

...-plugins/apm-servlet-plugin/src/main/java/co/elastic/apm/agent/servlet/ServletApiAdvice.java

eyalkoren · 2020-07-06T04:29:14Z

...-plugins/apm-servlet-plugin/src/main/java/co/elastic/apm/agent/servlet/ServletApiAdvice.java

+                servletTransactionHelper.fillRequestContext(transaction, request.getProtocol(), request.getMethod(), request.isSecure(),
+                    request.getScheme(), request.getServerName(), request.getServerPort(), request.getRequestURI(), request.getQueryString(),
+                    request.getRemoteAddr(), request.getHeader("Content-Type"));
+            } else if (transaction == null) {


Why is the transaction == null required here? Seems it will always be null

i changed here condition to ->

servletRequest.getDispatcherType() != DispatcherType.ASYNC

...-plugins/apm-servlet-plugin/src/main/java/co/elastic/apm/agent/servlet/ServletApiAdvice.java

eyalkoren · 2020-07-06T04:42:06Z

...-plugins/apm-servlet-plugin/src/main/java/co/elastic/apm/agent/servlet/ServletApiAdvice.java

+                    boolean isSpannableDispatcherType = false;
+                    span = parent.createSpan()
+                        .withType(SPAN_TYPE)
+                        .withSubtype(SPAN_SUBTYPE);


Do not create a span unless you know we need one. Currently these spans can leak. You must always end a span you created, like you must always deactivate a span you activated (which you did).
In rare cases (this is not one), you may create a span and then requestDiscarding it, but you still must end it.

eyalkoren · 2020-07-06T04:48:40Z

...-plugins/apm-servlet-plugin/src/main/java/co/elastic/apm/agent/servlet/ServletApiAdvice.java

+                        span.withAction(ERROR_SPAN_ACTION);
+                        isSpannableDispatcherType = true;
+                    }
+                    if (isSpannableDispatcherType && !parent.getNameAsString().equals(span.getNameAsString())) {


getNameAsString is allocating a String objects (so two in this comparison).
There are better ways to avoid creation of same nested spans. For example, before creating a span, see if the parent span has the same type, subtype and action.
What cases are you trying to prevent with this comparison?

…ARD, INCLUDE, ERROR minor fixes with creating span that has same names added path info for span name of FORWARD, INCLUDE dispatcher types. delete testTransactionReportingWithErrorHandling test Update apm-agent-plugins/apm-servlet-plugin/src/main/java/co/elastic/apm/agent/servlet/ServletApiAdvice.java Co-authored-by: eyalkoren <41850454+eyalkoren@users.noreply.github.com> Update apm-agent-plugins/apm-servlet-plugin/src/main/java/co/elastic/apm/agent/servlet/ServletApiAdvice.java Co-authored-by: eyalkoren <41850454+eyalkoren@users.noreply.github.com>

eyalkoren · 2020-08-06T10:22:50Z

@kananindzya thanks for taking this back. What's the state of this PR? Is it ready for another review?

videnkz · 2020-08-06T16:15:23Z

@kananindzya thanks for taking this back. What's the state of this PR? Is it ready for another review?

I updated yesterday as per the new changes. But there was a problem with integration tests, the isntrumentation for some reason not working. Today I will try to find the reason.
Next, I should add exception capture from http headers.
And change logic with comparing parent span type, subtype, action, instead of comparing nameAsString.

…as same name

eyalkoren

Thanks @kananindzya, looking good!

I started commenting but decided it's easier to code instead 🙂 .
Please see my suggested changes and if you feel it doesn't contradict anything you intended to do, please merge.
I mainly moved a couple of things around, saving some allocations.

I also removed a crash report you accidentally pushed but I wonder - does this need to trouble us? Do you know what caused this crash?

Suggested changes

videnkz · 2020-08-11T19:31:41Z

Thanks @kananindzya, looking good!

I started commenting but decided it's easier to code instead slightly_smiling_face .
Please see my suggested changes and if you feel it doesn't contradict anything you intended to do, please merge.
I mainly moved a couple of things around, saving some allocations.

I also removed a crash report you accidentally pushed but I wonder - does this need to trouble us? Do you know what caused this crash?

Great! Thanks you. I added exception handling.

videnkz · 2020-08-11T19:36:57Z

I also removed a crash report you accidentally pushed but I wonder - does this need to trouble us? Do you know what caused this crash?

No it shouldn't trouble you. Next time I will be more attentive before pushing changes.

…pans-request-dispatcher-forward-include

eyalkoren

Looking at your addition, I decided to cancel this error reporting. Assuming that the parent of such spans is the transaction, we will get the error reported by the transaction anyway.
I also added a test to demonstrate that.

eyalkoren · 2020-08-12T06:37:31Z

...-plugins/apm-servlet-plugin/src/main/java/co/elastic/apm/agent/servlet/ServletApiAdvice.java

+                            } else {
+                                if (Boolean.TRUE.equals(isExceptionAttributeCaptured.get())) {
+                                    t2 = null;
+                                }


No, we can't do that as we don't know if it's the same exception or not.

eyalkoren

Awesome!! 🎉

videnkz · 2020-08-12T09:11:38Z

Awesome!! tada

Thanks you

…orward-include Also apply few minor changes

ghost · 2020-10-20T17:25:36Z

Is there any way to disable these spans? They are taking a toll on our Elastic storage and we do not actually need them. I tried using the disable_instrumentations=servlet-api config but this causes the agent to not capture any page-load transactions anymore. Using spring-mvc here. Recently updated to 1.18.1 from 1.17.0.

eyalkoren · 2020-10-21T03:22:41Z

Can you share numbers? How many such spans do you get per transaction?

ghost · 2020-10-21T03:58:29Z

Hi @eyalkoren. We get from only a couple to more than a hundred. We had the same issue with spring-view-render and we were forced to stop instrumenting it. Once we did, the amount of used storage decreased to ~20GB per day, which was manageable. But now we have 140GB a day again, mostly jsp includes.

It is worth mentioning that we have lots of traffic.

I think the quick solution would be to downgrade to release 1.17.0 which was working fine for us.

eyalkoren · 2020-10-21T06:53:13Z

@Purdel please try this snapshot with adding servlet-api-dispatch to the disable_instrumentations config and see if it works for you.
(I am looking into the test failures, but I don't think they are related).

ghost · 2020-10-21T07:00:10Z

@eyalkoren wow, that was fast! Trying it out.

ghost · 2020-10-21T08:32:18Z

@eyalkoren looks good

eyalkoren · 2020-10-21T08:44:33Z

Awesome, thanks for verifying. #1448 is now merged.

ghost · 2020-10-21T13:16:19Z

@eyalkoren great, thank you very much! Any idea when the next release will come?

eyalkoren · 2020-10-26T09:10:09Z

I can't say exactly, but probably within a couple of weeks frame. You can register for notifications from our repo only on new releases.

videnkz force-pushed the issue-557-track-spans-request-dispatcher-forward-include branch from 9dfa4cc to e33b14d Compare June 1, 2020 20:01

videnkz force-pushed the issue-557-track-spans-request-dispatcher-forward-include branch 2 times, most recently from 722d42a to 99a0789 Compare June 2, 2020 11:36

videnkz force-pushed the issue-557-track-spans-request-dispatcher-forward-include branch 2 times, most recently from 6eef95e to db73c87 Compare June 9, 2020 18:53

videnkz force-pushed the issue-557-track-spans-request-dispatcher-forward-include branch from 0894c24 to ede2933 Compare June 14, 2020 20:37

eyalkoren reviewed Jun 18, 2020

View reviewed changes

eyalkoren suggested changes Jul 6, 2020

View reviewed changes

kananindzya added 2 commits August 5, 2020 22:21

merged from master

e77603e

videnkz force-pushed the issue-557-track-spans-request-dispatcher-forward-include branch from b5267a3 to e77603e Compare August 5, 2020 17:52

kananindzya and others added 3 commits August 7, 2020 03:48

fixed logic with excluded for psans

52b87b9

fixed logic with span creating, before we check that parent span is h…

c0dee57

…as same name

Suggested changes

df6c456

eyalkoren reviewed Aug 11, 2020

View reviewed changes

videnkz and others added 2 commits August 11, 2020 22:39

Merge pull request #6 from eyalkoren/suggested-changes

deed18c

Suggested changes

added RequestDispatcher.ERROR_EXCEPTION attribute exception handling

0dc1a1f

videnkz requested a review from eyalkoren August 11, 2020 19:32

eyalkoren added 2 commits August 12, 2020 09:44

Merge remote-tracking branch 'upstream/master' into issue-557-track-s…

532276b

…pans-request-dispatcher-forward-include

Error handling

02605be

eyalkoren reviewed Aug 12, 2020

View reviewed changes

eyalkoren approved these changes Aug 12, 2020

View reviewed changes

eyalkoren requested a review from SylvainJuge August 12, 2020 08:54

Merge branch 'master' into issue-557-track-spans-request-dispatcher-f…

5029085

…orward-include Also apply few minor changes

SylvainJuge approved these changes Aug 21, 2020

View reviewed changes

SylvainJuge merged commit 30ba723 into elastic:master Aug 21, 2020

eyalkoren mentioned this pull request Oct 21, 2020

Adding ability to disable Servlet dispatch spans #1448

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