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  1. HBase
  2. HBASE-4890

fix possible NPE in HConnectionManager

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Blocker
    • Resolution: Fixed
    • Affects Version/s: 0.92.0
    • Fix Version/s: 0.92.1, 0.94.0
    • Component/s: None
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      I was running YCSB against a 0.92 branch and encountered this error message:

      11/11/29 08:47:16 WARN client.HConnectionManager$HConnectionImplementation: Failed all from region=usertable,user3917479014967760871,1322555655231.f78d161e5724495a9723bcd972f97f41., hostname=c0316.hal.cloudera.com, port=57020
      java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.lang.NullPointerException
              at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
              at java.util.concurrent.FutureTask.get(FutureTask.java:83)
              at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatchCallback(HConnectionManager.java:1501)
              at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatch(HConnectionManager.java:1353)
              at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:898)
              at org.apache.hadoop.hbase.client.HTable.doPut(HTable.java:775)
              at org.apache.hadoop.hbase.client.HTable.put(HTable.java:750)
              at com.yahoo.ycsb.db.HBaseClient.update(Unknown Source)
              at com.yahoo.ycsb.DBWrapper.update(Unknown Source)
              at com.yahoo.ycsb.workloads.CoreWorkload.doTransactionUpdate(Unknown Source)
              at com.yahoo.ycsb.workloads.CoreWorkload.doTransaction(Unknown Source)
              at com.yahoo.ycsb.ClientThread.run(Unknown Source)
      Caused by: java.lang.RuntimeException: java.lang.NullPointerException
              at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getRegionServerWithoutRetries(HConnectionManager.java:1315)
              at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation$3.call(HConnectionManager.java:1327)
              at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation$3.call(HConnectionManager.java:1325)
              at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
              at java.util.concurrent.FutureTask.run(FutureTask.java:138)
              at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
              at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
              at java.lang.Thread.run(Thread.java:619)
      Caused by: java.lang.NullPointerException
              at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:158)
              at $Proxy4.multi(Unknown Source)
              at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation$3$1.call(HConnectionManager.java:1330)
              at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation$3$1.call(HConnectionManager.java:1328)
              at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getRegionServerWithoutRetries(HConnectionManager.java:1309)
              ... 7 more
      

      It looks like the NPE is caused by server being null in the MultiRespone call() method.

           public MultiResponse call() throws IOException {
               return getRegionServerWithoutRetries(
                   new ServerCallable<MultiResponse>(connection, tableName, null) {
                     public MultiResponse call() throws IOException {
                       return server.multi(multi);
                     }
                     @Override
                     public void connect(boolean reload) throws IOException {
                       server =
                         connection.getHRegionConnection(loc.getHostname(), loc.getPort());
                     }
                   }
               );
      

        Attachments

        1. 4890.txt
          1 kB
          stack
        2. 4890-v2.txt
          2 kB
          stack
        3. 4890-v3.txt
          2 kB
          stack
        4. 4890-v3.txt
          2 kB
          stack
        5. 4890-v3.txt
          2 kB
          stack
        6. splits.txt
          14 kB
          stack

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              • Assignee:
                stack stack
                Reporter:
                jmhsieh Jonathan Hsieh
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                Dates

                • Created:
                  Updated:
                  Resolved: