首先,我安装了 Hadoop (0.15.2) 并设置了一个包含 3 个节点的集群:NameNode、DataNode 和 JobTracker 各一个。所有守护程序都已启动并正在运行。但是当我发出任何命令时,都会出现上述错误。例如,当我执行 copyFromLocal 时,我收到以下错误:
我错过了什么吗?
更多详细信息:我正在尝试在 NFS 文件系统上安装 Hadoop。我已经安装了 1.0.4 版本并尝试运行它但无济于事。1.0.4 版本不启动数据节点。并且数据节点的日志文件是空的。因此我切换回 0.15 版本,它至少启动了所有守护进程。
我相信问题是由于底层 NFS 文件系统,即所有数据节点和主节点使用相同的文件和文件夹。但我不确定是否真的如此。但是我看不出有什么理由不能在 NFS 上运行 Hadoop(在适当地设置了配置参数之后)。
目前我正在尝试并弄清楚是否可以根据各个机器名称为不同的机器设置不同的名称和数据目录。
配置文件:(hadoop-site.xml)
<property>
<name>fs.default.name</name>
<value>mumble-12.cs.wisc.edu:9001</value>
</property>
<property>
<name>mapred.job.tracker</name>
<value>mumble-13.cs.wisc.edu:9001</value>
</property>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.secondary.info.port</name>
<value>9002</value>
</property>
<property>
<name>dfs.info.port</name>
<value>9003</value>
</property>
<property>
<name>mapred.job.tracker.info.port</name>
<value>9004</value>
</property>
<property>
<name>tasktracker.http.port</name>
<value>9005</value>
</property>
使用 Hadoop 1.0.4 时出错(DataNode 未启动):
2013-04-22 18:50:50,438 INFO org.apache.hadoop.ipc.Server: IPC Server handler 7 on 9001, call addBlock(/tmp/hadoop-akshar/mapred/system/jobtracker.info, DFSClient_502734479, null) from 128.105.112.13:37204: error: java.io.IOException: File /tmp/hadoop-akshar/mapred/system/jobtracker.info could only be replicated to 0 nodes, instead of 1
java.io.IOException: File /tmp/hadoop-akshar/mapred/system/jobtracker.info could only be replicated to 0 nodes, instead of 1
使用 Hadoop 0.15.2 时出错:
[akshar@mumble-12] (38)$ bin/hadoop fs -copyFromLocal lib/junit-3.8.1.LICENSE.txt input
13/04/17 03:22:11 WARN fs.DFSClient: Error while writing.
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:189)
at java.net.SocketInputStream.read(SocketInputStream.java:121)
at java.net.SocketInputStream.read(SocketInputStream.java:203)
at java.io.DataInputStream.readShort(DataInputStream.java:312)
at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.endBlock(DFSClient.java:1660)
at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.close(DFSClient.java:1733)
at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:49)
at org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:64)
at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:55)
at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:83)
at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:140)
at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:826)
at org.apache.hadoop.fs.FsShell.copyFromLocal(FsShell.java:120)
at org.apache.hadoop.fs.FsShell.run(FsShell.java:1360)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
at org.apache.hadoop.fs.FsShell.main(FsShell.java:1478)
13/04/17 03:22:12 WARN fs.DFSClient: Error while writing.
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:189)
at java.net.SocketInputStream.read(SocketInputStream.java:121)
at java.net.SocketInputStream.read(SocketInputStream.java:203)
at java.io.DataInputStream.readShort(DataInputStream.java:312)
at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.endBlock(DFSClient.java:1660)
at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.close(DFSClient.java:1733)
at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:49)
at org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:64)
at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:55)
at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:83)
at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:140)
at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:826)
at org.apache.hadoop.fs.FsShell.copyFromLocal(FsShell.java:120)
at org.apache.hadoop.fs.FsShell.run(FsShell.java:1360)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
at org.apache.hadoop.fs.FsShell.main(FsShell.java:1478)
13/04/17 03:22:12 WARN fs.DFSClient: Error while writing.
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:189)
at java.net.SocketInputStream.read(SocketInputStream.java:121)
at java.net.SocketInputStream.read(SocketInputStream.java:203)
at java.io.DataInputStream.readShort(DataInputStream.java:312)
at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.endBlock(DFSClient.java:1660)
at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.close(DFSClient.java:1733)
at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:49)
at org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:64)
at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:55)
at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:83)
at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:140)
at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:826)
at org.apache.hadoop.fs.FsShell.copyFromLocal(FsShell.java:120)
at org.apache.hadoop.fs.FsShell.run(FsShell.java:1360)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
at org.apache.hadoop.fs.FsShell.main(FsShell.java:1478)
copyFromLocal: Connection reset