hadoop - 当我点击 jps 命令时，namenode datanode 和 sec name node 没有启动

Question

我在 Ubuntu 中以伪分布式模式使用 Hadoop 1.2.1，一切正常。但后来我不得不重新启动我的系统。现在，当我在给出 start-all.sh 后点击 jps 命令时，我只能看到 tasktracker 和 jobtracker 正在运行。谁能告诉我这个问题的可能原因？并指导我解决这个问题？

************************************************************/
2017-03-13 18:41:16,733 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG: 
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG:   host = keerthana-VirtualBox/127.0.1.1
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 1.2.1
STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r 1503152; compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013
STARTUP_MSG:   java = 1.8.0_121
************************************************************/
2017-03-13 18:41:19,383 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties
2017-03-13 18:41:19,628 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered.
2017-03-13 18:41:19,653 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).
2017-03-13 18:41:19,653 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system started
2017-03-13 18:41:21,947 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi registered.
2017-03-13 18:41:22,117 WARN org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Source name ugi already exists!
2017-03-13 18:41:23,564 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Invalid directory in dfs.data.dir: Incorrect permission for /home/keerthana/hadoop/dfs/data, expected: rwxr-xr-x, while actual: rwxrwxr-x
2017-03-13 18:41:23,564 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: All directories in dfs.data.dir are invalid.
2017-03-13 18:41:23,564 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Exiting Datanode
2017-03-13 18:41:23,630 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG: 
/************************************************************
SHUTDOWN_MSG: Shutting down DataNode at keerthana-VirtualBox/127.0.1.1
************************************************************/

Answer 1

根据日志的建议，dfs.data.dir“/home/keerthana/hadoop/dfs/data”位置存在一些问题。

提供检查文件夹是否存在以及它们是否具有适当的权限。如果文件夹存在，则为该文件夹提供 755 访问权限。

chmod -R 755 /home/keerthana/hadoop/dfs/data