Hadoop SecondaryNameNode 异常
异常信息
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2012-03-15 16:52:01,150 WARN org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: Checkpoint Period ? :3600 secs (60 min)
2012-03-15 16:52:01,151 WARN org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: Log Size Trigger ? ?:67108864 bytes (65536 KB)
2012-03-15 16:57:01,389 ERROR org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: Exception in doCheckpoint:?
2012-03-15 16:57:01,391 ERROR org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: java.net.ConnectException: Connection refused
? ? ? ? at java.net.PlainSocketImpl.socketConnect(Native Method)
? ? ? ? at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
? ? ? ? at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:198)
? ? ? ? at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
? ? ? ? at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
? ? ? ? at java.net.Socket.connect(Socket.java:579)
? ? ? ? at java.net.Socket.connect(Socket.java:528)
? ? ? ? at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
? ? ? ? at sun.net.www.http.HttpClient.openServer(HttpClient.java:388)
? ? ? ? at sun.net.www.http.HttpClient.openServer(HttpClient.java:483)
? ? ? ? at sun.net.www.http.HttpClient.<init>(HttpClient.java:213)
? ? ? ? at sun.net.www.http.HttpClient.New(HttpClient.java:300)
? ? ? ? at sun.net.www.http.HttpClient.New(HttpClient.java:316)
? ? ? ? at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:992)
? ? ? ? at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:928)
? ? ? ? at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:846)
? ? ? ? at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1296)
? ? ? ? at org.apache.hadoop.hdfs.server.namenode.TransferFsImage.getFileClient(TransferFsImage.java:160)
? ? ? ? at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode$3.run(SecondaryNameNode.java:347)
? ? ? ? at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode$3.run(SecondaryNameNode.java:336)
? ? ? ? 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:1059)
? ? ? ? at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.downloadCheckpointFiles(SecondaryNameNode.java:336)
? ? ? ? at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.doCheckpoint(SecondaryNameNode.java:411)
? ? ? ? at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.doWork(SecondaryNameNode.java:312)
? ? ? ? at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.run(SecondaryNameNode.java:275)
? ? ? ? at java.lang.Thread.run(Thread.java:722)
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原因：
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?hdfs-site.xml
<name>dfs.http.address</name>
<value>{your_namenode_ip}:50070</value>
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文件中此属性没有配置，second NameNode 无法从NameNode 获取数据。（HTTP的方式获取数据）
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此时second NameNode ?节点下?：{hadoop.tmp.di}/dfs/namesecondary/current/ 目录下的数据为空
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因为无法完成和NameNode 节点之间的数据同步。
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