jon-wei opened a new issue #6967: NoClassDefFoundError when using druid-hdfs-storage URL: https://github.com/apache/incubator-druid/issues/6967 Running the current master with druid-hdfs-storage enabled results in the following exception on startup: ``` 2019-01-31T02:53:27,216 INFO [main] org.apache.druid.initialization.Initialization - Adding implementation [org.apache.druid.storage.hdfs.HdfsStorageDruidModule] for class [interface org.apache.druid.initialization.DruidModule] from local file system extension Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/conf/Configuration at org.apache.druid.storage.hdfs.HdfsStorageDruidModule.configure(HdfsStorageDruidModule.java:97) at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:340) at com.google.inject.spi.Elements.getElements(Elements.java:110) at com.google.inject.util.Modules$OverrideModule.configure(Modules.java:198) at com.google.inject.AbstractModule.configure(AbstractModule.java:62) at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:340) at com.google.inject.spi.Elements.getElements(Elements.java:110) at com.google.inject.internal.InjectorShell$Builder.build(InjectorShell.java:138) at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:104) at com.google.inject.Guice.createInjector(Guice.java:99) at com.google.inject.Guice.createInjector(Guice.java:73) at com.google.inject.Guice.createInjector(Guice.java:62) at org.apache.druid.initialization.Initialization.makeInjectorWithModules(Initialization.java:419) at org.apache.druid.cli.GuiceRunnable.makeInjector(GuiceRunnable.java:69) at org.apache.druid.cli.ServerRunnable.run(ServerRunnable.java:57) at org.apache.druid.cli.Main.main(Main.java:118) Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.conf.Configuration at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 16 more ``` Likely related to changes with `hadoop-common` in https://github.com/apache/incubator-druid/pull/6828
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