[SPARK-29087][CORE][STREAMING] Use DelegatingServletContextHandler to avoid CCE
### What changes were proposed in this pull request? [SPARK-27122](https://github.com/apache/spark/pull/24088) fixes `ClassCastException` at `yarn` module by introducing `DelegatingServletContextHandler`. Initially, this was discovered with JDK9+, but the class path issues affected JDK8 environment, too. After [SPARK-28709](https://github.com/apache/spark/pull/25439), I also hit the similar issue at `streaming` module. This PR aims to fix `streaming` module by adding `getContextPath` to `DelegatingServletContextHandler` and using it. ### Why are the changes needed? Currently, when we test `streaming` module independently, it fails like the following. ``` $ build/mvn test -pl streaming ... UISeleniumSuite: - attaching and detaching a Streaming tab *** FAILED *** java.lang.ClassCastException: org.sparkproject.jetty.servlet.ServletContextHandler cannot be cast to org.eclipse.jetty.servlet.ServletContextHandler ... Tests: succeeded 337, failed 1, canceled 0, ignored 1, pending 0 *** 1 TEST FAILED *** [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ ``` ### Does this PR introduce any user-facing change? No. ### How was this patch tested? Pass the Jenkins with the modified tests. And do the following manually. Since you can observe this when you run `streaming` module test only (instead of running all), you need to install the changed `core` module and use it. ``` $ java -version openjdk version "1.8.0_222" OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_222-b10) OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.222-b10, mixed mode) $ build/mvn install -DskipTests $ build/mvn test -pl streaming ``` Closes #25791 from dongjoon-hyun/SPARK-29087. Authored-by: Dongjoon Hyun <dhyun@apple.com> Signed-off-by: Dongjoon Hyun <dhyun@apple.com>
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@ -236,4 +236,8 @@ private[spark] class DelegatingServletContextHandler(handler: ServletContextHand
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def filterCount(): Int = {
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handler.getServletHandler.getFilters.length
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}
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def getContextPath(): String = {
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handler.getContextPath
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}
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}
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@ -97,7 +97,7 @@ class UISeleniumSuite
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val sparkUI = ssc.sparkContext.ui.get
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sparkUI.getHandlers.count(_.getContextPath.contains("/streaming")) should be (5)
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sparkUI.getDelegatingHandlers.count(_.getContextPath.contains("/streaming")) should be (5)
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eventually(timeout(10.seconds), interval(50.milliseconds)) {
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go to (sparkUI.webUrl.stripSuffix("/"))
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@ -198,7 +198,7 @@ class UISeleniumSuite
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ssc.stop(false)
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sparkUI.getHandlers.count(_.getContextPath.contains("/streaming")) should be (0)
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sparkUI.getDelegatingHandlers.count(_.getContextPath.contains("/streaming")) should be (0)
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eventually(timeout(10.seconds), interval(50.milliseconds)) {
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go to (sparkUI.webUrl.stripSuffix("/"))
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