Hadoop1.2.0的DataNode启动失败异常

朱雀 2022-04-13 11:10 159阅读 0赞

\[b\]\[color=green\]\[size=large\]在配置hadoop1.x的集群时，如果我们在hdfs-site.xml里面，如果明确指定了dfs的路径，需要设置下dfs.data.dir的权限，下面是散仙在Hadoop1.2.0里面的配置：\[/size\]\[/color\]\[/b\]

<configuration>
    <property>
    <name>dfs.replication</name>
    <value>1</value>
    </property>
    
    <property>
    <name>dfs.name.dir</name>
    <value>/home/search/hadoop/hadoopnd</value>
    </property>
    
    <property>
    <name>dfs.data.dir</name>
    <value>/home/search/hadoop/hadoopdd</value>
    </property>
    <property>
    <name>dfs.tmp.dir</name>
    <value>/home/search/hadoop/tmp</value>
    </property>
    <property>
    <name>dfs.permissions</name>
    <value>false</value>
    </property>
    
    </configuration>

\[b\]\[color=olive\]\[size=large\]异常详情：\[/size\]\[/color\]\[/b\]

[search@ph1 logs]$ tail -100f hadoop-search-datanode-ph1.log 
    2014-07-16 22:08:58,139 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG: 
    /************************************************************
    STARTUP_MSG: Starting DataNode
    STARTUP_MSG:   host = ph1/192.168.46.23
    STARTUP_MSG:   args = []
    STARTUP_MSG:   version = 1.2.0
    STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r 1479473; compiled by 'hortonfo' on Mon May  6 06:59:37 UTC 2013
    STARTUP_MSG:   java = 1.7.0_25
    ************************************************************/
    2014-07-16 22:08:58,463 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties
    2014-07-16 22:08:58,485 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered.
    2014-07-16 22:08:58,487 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).
    2014-07-16 22:08:58,487 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system started
    2014-07-16 22:08:58,664 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi registered.
    2014-07-16 22:08:58,779 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Invalid directory in dfs.data.dir: Incorrect permission for /home/search/hadoop/hadoopdd, expected: rwxr-xr-x, while actual: rwxrwxr-x
    2014-07-16 22:08:58,779 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: All directories in dfs.data.dir are invalid.
    2014-07-16 22:08:58,779 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Exiting Datanode
    2014-07-16 22:08:58,784 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG: 
    /************************************************************
    SHUTDOWN_MSG: Shutting down DataNode at ph1/192.168.46.23
    ************************************************************/

\[b\]\[color=olive\]\[size=large\]注意日志里面warn和error处的信息，\[/size\]\[/color\]\[/b\]  
\[b\]\[color=green\]\[size=large\]出现这个异常，会导致DataNode启动失败，解决办法：  
使用root用户，给这个文件夹赋值755权限，执行命令如下：  
\[/size\]\[/color\]\[/b\]

chmod 755 -R  /home/search/hadoop-1.2.0/hadoopdd