Start, stop, and stop the daemon in Hadoop.

Start, stop, and stop the daemon in Hadoop.

Version Hadoop-1.2.1

Script description

The start-all.sh starts all Hadoop daemon. Including NameNode, Secondary NameNode, DataNode, JobTracker, TaskTrack

The stop-all.sh stops all Hadoop daemon. Including NameNode, Secondary NameNode, DataNode, JobTracker, TaskTrack

Start-dfs.sh starts Hadoop HDFS daemon NameNode, SecondaryNameNode and DataNode

Stop-dfs.sh stops Hadoop HDFS daemon NameNode, SecondaryNameNode and DataNode
Hadoop-daemons.sh start namenode start NameNode daemon separately
Hadoop-daemons.sh stop namenode stop NameNode daemon separately
Hadoop-daemons.sh start datanode start DataNode daemon separately
Hadoop-daemons.sh stop datanode stop DataNode daemon separately
Hadoop-daemons.sh start secondarynamenode start SecondaryNameNode daemon separately
Hadoop-daemons.sh stop secondarynamenode stop SecondaryNameNode daemon separately
Start-mapred.sh starts Hadoop MapReduce daemon JobTracker and TaskTracker
Stop-mapred.sh stops Hadoop MapReduce daemon JobTracker and TaskTracker
Hadoop-daemons.sh start jobtracker start JobTracker daemon separately
Hadoop-daemons.sh stop jobtracker stop JobTracker daemon separately
Hadoop-daemons.sh start tasktracker start TaskTracker daemon separately
Hadoop-daemons.sh stop tasktracker start TaskTracker daemon separately

If the Hadoop cluster is started for the first time, you can use the start-all.sh. A common start method is to start a daemon by using the following daemon.

1. Start the daemon process in the HDFS module of Hadoop.

The daemon processes in HDFS are also started in sequence, namely:

1) Start the NameNode daemon;

2) Start the DataNode daemon;

3) Start the SecondaryNameNode daemon.

2. Start the daemon process in the MapReduce Module

The startup of the MapReduce daemon is also ordered, namely:

1) Start the JobTracker daemon;

2) Start the TaskTracker daemon.

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