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  1. Hadoop Common
  2. HADOOP-16080

hadoop-aws does not work with hadoop-client-api

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      I attempted to use Accumulo and S3a with the following jars on the classpath.

      • hadoop-client-api-3.1.1.jar
      • hadoop-client-runtime-3.1.1.jar
      • hadoop-aws-3.1.1.jar

      This failed with the following exception.

      Exception in thread "init" java.lang.NoSuchMethodError: org.apache.hadoop.util.SemaphoredDelegatingExecutor.<init>(Lcom/google/common/util/concurrent/ListeningExecutorService;IZ)V
          at org.apache.hadoop.fs.s3a.S3AFileSystem.create(S3AFileSystem.java:769)
          at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:1169)
          at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:1149)
          at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:1108)
          at org.apache.hadoop.fs.FileSystem.createNewFile(FileSystem.java:1413)
          at org.apache.accumulo.server.fs.VolumeManagerImpl.createNewFile(VolumeManagerImpl.java:184)
          at org.apache.accumulo.server.init.Initialize.initDirs(Initialize.java:479)
          at org.apache.accumulo.server.init.Initialize.initFileSystem(Initialize.java:487)
          at org.apache.accumulo.server.init.Initialize.initialize(Initialize.java:370)
          at org.apache.accumulo.server.init.Initialize.doInit(Initialize.java:348)
          at org.apache.accumulo.server.init.Initialize.execute(Initialize.java:967)
          at org.apache.accumulo.start.Main.lambda$execKeyword$0(Main.java:129)
          at java.lang.Thread.run(Thread.java:748)
      

      The problem is that S3AFileSystem.create() looks for SemaphoredDelegatingExecutor(com.google.common.util.concurrent.ListeningExecutorService) which does not exist in hadoop-client-api-3.1.1.jar. What does exist is SemaphoredDelegatingExecutor(org.apache.hadoop.shaded.com.google.common.util.concurrent.ListeningExecutorService).

      To work around this issue I created a version of hadoop-aws-3.1.1.jar that relocated references to Guava.

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            csun Chao Sun
            kturner Keith Turner
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