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From "Trevor Robinson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3822) TestWebHDFS fails intermittently with NullPointerException
Date Mon, 20 Aug 2012 23:13:38 GMT
Trevor Robinson created HDFS-3822:
-------------------------------------

             Summary: TestWebHDFS fails intermittently with NullPointerException
                 Key: HDFS-3822
                 URL: https://issues.apache.org/jira/browse/HDFS-3822
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: test
    Affects Versions: 2.2.0-alpha
         Environment: Apache Maven 3.0.4
Maven home: /usr/share/maven
Java version: 1.6.0_24, vendor: Sun Microsystems Inc.
Java home: /usr/lib/jvm/java-6-openjdk-amd64/jre
Default locale: en_US, platform encoding: ISO-8859-1
OS name: "linux", version: "3.2.0-25-generic", arch: "amd64", family: "unix"
            Reporter: Trevor Robinson


I've hit this test failure a few times in trunk:

{noformat}
Tests run: 2, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 58.835 sec <<< FAILURE!
testNamenodeRestart(org.apache.hadoop.hdfs.web.TestWebHDFS)  Time elapsed: 52.105 sec  <<<
FAILURE!
java.lang.AssertionError: There are 1 exception(s):
  Exception 0: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.RemoteException):
java.lang.NullPointerExcept
ion
        at org.apache.hadoop.hdfs.server.blockmanagement.BlocksMap.getBlockCollection(BlocksMap.java:101)
        at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.getBlockCollection(BlockManager.java:2926)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.isValidBlock(FSNamesystem.java:4474)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.allocateBlock(FSNamesystem.java:2439)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2200)
        at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:471)
        at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtoco
lServerSideTranslatorPB.java:295)
        at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMetho
d(ClientNamenodeProtocolProtos.java:43388)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:473)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:898)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1693)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1689)
{noformat}

It appears that {{close}} has been called on the {{BlocksMap}} before {{getBlockCollection}}.

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