hadoop - 将数据节点添加到 hadoop 集群

Question

当我使用 start-all.sh 启动 hadoopnode1 时，它成功地启动了 master 和 slave 上的服务(请参阅 slave 的 jps 命令输出)。但是当我尝试在管理屏幕中查看事件节点时，从属节点没有出现。即使当我从 master 运行 hadoop fs -ls/ 命令时，它也能完美运行，但从 salve 时它显示错误消息

@hadoopnode2:~/hadoop-0.20.2/conf$ hadoop fs -ls /
12/05/28 01:14:20 INFO ipc.Client: Retrying connect to server: hadoopnode1/192.168.1.120:8020. Already tried 0 time(s).
12/05/28 01:14:21 INFO ipc.Client: Retrying connect to server: hadoopnode1/192.168.1.120:8020. Already tried 1 time(s).
12/05/28 01:14:22 INFO ipc.Client: Retrying connect to server: hadoopnode1/192.168.1.120:8020. Already tried 2 time(s).
12/05/28 01:14:23 INFO ipc.Client: Retrying connect to server: hadoopnode1/192.168.1.120:8020. Already tried 3 time(s).
.
.
.
12/05/28 01:14:29 INFO ipc.Client: Retrying connect to server: hadoopnode1/192.168.1.120:8020. Already tried 10 time(s).

看起来从节点 (hadoopnode2) 无法找到/连接主节点 (hadoopnode1)

请指出我遗漏了什么？

这是主节点和从节点的设置 -附言- 主从运行相同版本的 Linux 和 Hadoop 以及 SSH 工作正常，因为我可以从主节点启动从节点

master(hadoopnode1) 和 slave (hadoopnode2) 上的 core-site.xml、hdfs-site.xml 和 mapred-site.xml 的设置也相同

操作系统 - Ubuntu 10Hadoop 版本 -

oop@hadoopnode1:~/hadoop-0.20.2/conf$ hadoop version
Hadoop 0.20.2
Subversion https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20 -r 911707
Compiled by chrisdo on Fri Feb 19 08:07:34 UTC 2010

-- Master (hadoopnode1)

hadoop@hadoopnode1:~/hadoop-0.20.2/conf$ uname -a
Linux hadoopnode1 2.6.35-32-generic #67-Ubuntu SMP Mon Mar 5 19:35:26 UTC 2012 i686 GNU/Linux

hadoop@hadoopnode1:~/hadoop-0.20.2/conf$ jps
9923 Jps
7555 NameNode
8133 TaskTracker
7897 SecondaryNameNode
7728 DataNode
7971 JobTracker

masters -> hadoopnode1
slaves -> hadoopnode1
hadoopnode2

--从机(hadoopnode2)

hadoop@hadoopnode2:~/hadoop-0.20.2/conf$ uname -a
Linux hadoopnode2 2.6.35-32-generic #67-Ubuntu SMP Mon Mar 5 19:35:26 UTC 2012 i686 GNU/Linux

hadoop@hadoopnode2:~/hadoop-0.20.2/conf$ jps
1959 DataNode
2631 Jps
2108 TaskTracker

masters - hadoopnode1

core-site.xml
hadoop@hadoopnode2:~/hadoop-0.20.2/conf$ cat core-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>
        <property>
                <name>hadoop.tmp.dir</name>
                <value>/var/tmp/hadoop/hadoop-${user.name}</value>
                <description>A base for other temp directories</description>
        </property>

        <property>
                <name>fs.default.name</name>
                <value>hdfs://hadoopnode1:8020</value>
                <description>The name of the default file system</description>
        </property>

</configuration>

hadoop@hadoopnode2:~/hadoop-0.20.2/conf$ cat mapred-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>
        <property>
                <name>mapred.job.tracker</name>
                <value>hadoopnode1:8021</value>
                <description>The host and port that the MapReduce job tracker runs at.If "local", then jobs are run in process as a single map</description>
        </property>
</configuration>

hadoop@hadoopnode2:~/hadoop-0.20.2/conf$ cat hdfs-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>
        <property>
                <name>dfs.replication</name>
                <value>2</value>
                <description>Default block replication</description>
        </property>
</configuration>

Answer 1

通过 sudo jps 检查你的服务master 不应该显示你需要做什么

Restart Hadoop
Go to /app/hadoop/tmp/dfs/name/current
Open VERSION (i.e. by vim VERSION)
Record namespaceID
Go to /app/hadoop/tmp/dfs/data/current
Open VERSION (i.e. by vim VERSION)
Replace the namespaceID with the namespaceID you recorded in step 4.

这应该有效。祝你好运