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  1. Hadoop HDFS
  2. HDFS-14216

NullPointerException happens in NamenodeWebHdfs

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Details

    • Bug
    • Status: Resolved
    • Critical
    • Resolution: Fixed
    • None
    • 3.3.0, 3.2.1, 3.1.4, 2.10.2
    • None
    • None

    Description

       workload

      curl -i -X PUT -T $HOMEPARH/test.txt "http://hadoop1:9870/webhdfs/v1/input?op=CREATE&excludedatanodes=hadoop2"
      

      the method

      org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods.chooseDatanode(String excludeDatanodes){
      
          HashSet<Node> excludes = new HashSet<Node>();
          if (excludeDatanodes != null) {
             for (String host : StringUtils
               .getTrimmedStringCollection(excludeDatanodes)) {
               int idx = host.indexOf(":");
             if (idx != -1) { 
                  excludes.add(bm.getDatanodeManager().getDatanodeByXferAddr(
                 host.substring(0, idx), Integer.parseInt(host.substring(idx + 1))));
             } else {
                excludes.add(bm.getDatanodeManager().getDatanodeByHost(host));//line280
             }
            }
          }
      
      }
      

      when datanode(e.g.hadoop2) is just  wiped before line280, or we give the wrong DN name*,then  bm.getDatanodeManager().getDatanodeByHost(host) will return null, *excludes containes null. while excludes are used later, NPE happens:

      java.lang.NullPointerException
      at org.apache.hadoop.net.NodeBase.getPath(NodeBase.java:113)
      at org.apache.hadoop.net.NetworkTopology.countNumOfAvailableNodes(NetworkTopology.java:672)
      at org.apache.hadoop.net.NetworkTopology.chooseRandom(NetworkTopology.java:533)
      at org.apache.hadoop.net.NetworkTopology.chooseRandom(NetworkTopology.java:491)
      at org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods.chooseDatanode(NamenodeWebHdfsMethods.java:323)
      at org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods.redirectURI(NamenodeWebHdfsMethods.java:384)
      at org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods.put(NamenodeWebHdfsMethods.java:652)
      at org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods$2.run(NamenodeWebHdfsMethods.java:600)
      at org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods$2.run(NamenodeWebHdfsMethods.java:597)
      at org.apache.hadoop.ipc.ExternalCall.run(ExternalCall.java:73)
      at org.apache.hadoop.ipc.ExternalCall.run(ExternalCall.java:30)
      at java.security.AccessController.doPrivileged(Native Method)
      at javax.security.auth.Subject.doAs(Subject.java:422)
      at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1876)
      at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2830)
      

       

      Attachments

        1. hadoop-hires-namenode-hadoop11.log
          46 kB
          lujie
        2. HDFS-14216_1.patch
          1 kB
          lujie
        3. HDFS-14216_2.patch
          2 kB
          lujie
        4. HDFS-14216_3.patch
          3 kB
          lujie
        5. HDFS-14216_4.patch
          3 kB
          lujie
        6. HDFS-14216_5.patch
          3 kB
          lujie
        7. HDFS-14216_6.patch
          3 kB
          Surendra Singh Lilhore
        8. HDFS-14216.branch-3.1.patch
          4 kB
          Wei-Chiu Chuang

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              xiaoheipangzi lujie
              xiaoheipangzi lujie
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                Created:
                Updated:
                Resolved: