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https://issues.apache.org/jira/browse/HDFS-42?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14292557#comment-14292557
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Steve Loughran commented on HDFS-42:
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HADOOP-5687 duplicated this; it contained the patch
> NetUtils.createSocketAddr NPEs if dfs.datanode.ipc.address is not set for a
> data node
> -------------------------------------------------------------------------------------
>
> Key: HDFS-42
> URL: https://issues.apache.org/jira/browse/HDFS-42
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.20.1, 0.20.2, 0.21.0, 0.22.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Labels: newbie
> Fix For: 0.21.0
>
>
> DataNode.startDatanode assumes that a configuration always returns a non-null
> dfs.datanode.ipc.address value, as the result is passed straight down to
> NetUtils.createSocketAddr
> InetSocketAddress ipcAddr = NetUtils.createSocketAddr(
> conf.get("dfs.datanode.ipc.address"));
> which triggers an NPE
> Caused by: java.lang.NullPointerException
> at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:130)
> at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:119)
> at org.apache.hadoop.dfs.DataNode.startDataNode(DataNode.java:353)
> at org.apache.hadoop.dfs.DataNode.(DataNode.java:185)
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