elek opened a new pull request #653: HDDS-1333. OzoneFileSystem can't work with spark/hadoop2.7 because incompatible security classes URL: https://github.com/apache/hadoop/pull/653 The current ozonefs compatibility layer is broken by: HDDS-1299. The spark jobs (including hadoop 2.7) can't be executed any more: {code} 2019-03-25 09:50:08 INFO StateStoreCoordinatorRef:54 - Registered StateStoreCoordinator endpoint Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/crypto/key/KeyProviderTokenIssuer at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:763) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:468) at java.net.URLClassLoader.access$100(URLClassLoader.java:74) at java.net.URLClassLoader$1.run(URLClassLoader.java:369) at java.net.URLClassLoader$1.run(URLClassLoader.java:363) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:362) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:348) at org.apache.hadoop.conf.Configuration.getClassByNameOrNull(Configuration.java:2134) at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:2099) at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2193) at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2654) at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2667) at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:94) at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2703) at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2685) at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:373) at org.apache.hadoop.fs.Path.getFileSystem(Path.java:295) at org.apache.spark.sql.execution.streaming.FileStreamSink$.hasMetadata(FileStreamSink.scala:45) at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:332) at org.apache.spark.sql.DataFrameReader.loadV1Source(DataFrameReader.scala:223) at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:211) at org.apache.spark.sql.DataFrameReader.text(DataFrameReader.scala:715) at org.apache.spark.sql.DataFrameReader.textFile(DataFrameReader.scala:757) at org.apache.spark.sql.DataFrameReader.textFile(DataFrameReader.scala:724) at org.apache.spark.examples.JavaWordCount.main(JavaWordCount.java:45) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52) at org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:849) at org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:167) at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:195) at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:86) at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:924) at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:933) at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala) Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.crypto.key.KeyProviderTokenIssuer at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 43 more {code} See: https://issues.apache.org/jira/browse/HDDS-1333
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