java.lang.NullPointerException

Server Fault | JasCav | 3 years ago
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    java.lang.NullPointerException When Doing A Read in HDFS

    Server Fault | 3 years ago | JasCav
    java.lang.NullPointerException
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    Why do non data nodes need rack awareness?

    Google Groups | 9 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