java.lang.NullPointerException

Server Fault | JasCav | 3 years ago
  1. 0

    java.lang.NullPointerException When Doing A Read in HDFS

    Server Fault | 3 years ago | JasCav
    java.lang.NullPointerException
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  3. 0

    Why do non data nodes need rack awareness?

    Google Groups | 6 months ago | Colin Kincaid Williams
    java.lang.NullPointerException

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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.sortLocatedBlocks()
    2. Apache Hadoop HDFS
      ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod
      1. org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.sortLocatedBlocks(DatanodeManager.java:334)
      2. org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocations(FSNamesystem.java:1343)
      3. org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getBlockLocations(NameNodeRpcServer.java:413)
      4. org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getBlockLocations(ClientNamenodeProtocolServerSideTranslatorPB.java:172)
      5. org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java:44938)
      5 frames
    3. Hadoop
      Server$Handler$1.run
      1. org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:453)
      2. org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1002)
      3. org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1752)
      4. org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1748)
      4 frames
    4. Java RT
      Subject.doAs
      1. java.security.AccessController.doPrivileged(Native Method)
      2. javax.security.auth.Subject.doAs(Subject.java:396)
      2 frames
    5. Hadoop
      Server$Handler.run
      1. org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1438)
      2. org.apache.hadoop.ipc.Server$Handler.run(Server.java:1746)
      2 frames