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From "Guo Ruijing (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6590) NullPointerException was generated in getBlockLocalPathInfo when datanode restarts
Date Tue, 15 Jul 2014 09:10:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14061863#comment-14061863
] 

Guo Ruijing commented on HDFS-6590:
-----------------------------------

Root-cause: data is not initialized and referenced in data.getBlockLocalPathInfo(block);

fix solution 1:

existing:
in getBlockLocalPathInfo()
{
    BlockLocalPathInfo info = data.getBlockLocalPathInfo(block);
}

new:
in getBlockLocalPathInfo()
{  
    BlockLocalPathInfo info = null;
    if (data != null)  {
        info = data.getBlockLocalPathInfo(block);
    }
}

> NullPointerException was generated in getBlockLocalPathInfo when datanode restarts
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-6590
>                 URL: https://issues.apache.org/jira/browse/HDFS-6590
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 2.2.0
>            Reporter: Guo Ruijing
>
> 2014-06-11 20:34:40.240119, p43949, th140725562181728, ERROR cannot setup block reader
for Block: [block pool ID: BP-1901161041-172.28.1.251-1402542341112 block ID 1073741926_1102]
on Datanode: sdw3(172.28.1.3).
> RpcHelper.h: 74: HdfsIOException: Unexpected exception: when unwrap the rpc remote exception
""java.lang.NullPointerException"", java.lang.NullPointerException
> at org.apache.hadoop.hdfs.server.datanode.DataNode.getBlockLocalPathInfo(DataNode.java:1014)
> at org.apache.hadoop.hdfs.protocolPB.ClientDatanodeProtocolServerSideTranslatorPB.getBlockLocalPathInfo(ClientDatanodeProtocolServerSideTranslatorPB.java:112)
> at org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos$ClientDatanodeProtocolService$2.callBlockingMethod(ClientDatanodeProtocolProtos.java:6373)
> at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:928)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2048)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2044)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2042)



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