Support Questions

asliyanage · ‎02-18-2017

I need to formate the namenode. So i use below command to formate the namenode.

./bin/hadoop namenode -format

When i run the above command it gives me ,it formatted below formatted.But my namenode is located in different directory.Why its formatting temp forlder namenode.

17/02/18 10:17:17 INFO common.Storage: Storage directory /tmp/hadoop-aruna/dfs/name has been successfully formatted.

Below is the my .bashrc file configuration

#SET Hadoop Related Envirment Variable
export HADOOP_HOME=/home/aruna/hadoop-2.7.3
export HADOOP_CONF_DIR=/home/aruna/hadoop-2.7.3/etc/hadoop
export HADOOP_MAPRED_HOME=/home/aruna/hadoop-2.7.3
export HADOOP_COMMON_HOME=/home/aruna/hadoop-2.7.3
export HADOOP_HDFS_HOME=/home/aruna/hadoop-2.7.3
export YARN_HOME=/home/aruna/hadoop-2.7.3
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
export HADOOP_OPTS="-Djava.library.path=$HADOOP_HOME/lib/native"

#Set Java Home
export JAVA_HOME=/usr/lib/jvm/java-7-oracle
export PATH=$PATH:/usr/lib/jvm/java-7-oracle/bin

#Set Hadoop bin  directory PATH
export PATH=$PATH:/home/aruna/hadoop-2.7.3/bin
export HADOOP_PID_DIR=/home/aruna/hadoop-2.7.3/hadoop2_data/hdfs/pid

normally namenode should be in below path.

/home/aruna/hadoop-2.7.3/hadoop2_data/hdfs/namenode

jsensharma · ‎02-18-2017

@Aruna Sameera

The "hadoop namenode -format" command formats the specified NameNode. It starts the NameNode, formats it and then shut it down.

dfs.namenode.name.dir: Determines where on the local filesystem the DFS name node should store the name table(fsimage). If this is a comma-delimited list of directories then the name table is replicated in all of the directories, for redundancy. with default value ${hadoop.tmp.dir}/dfs/name.

dfs.datanode.data.dir: (default: file://${hadoop.tmp.dir}/dfs/data) - Determines where on the local filesystem an DFS data node should store its blocks.

hadoop.tmp.dir: "/tmp/hadoop-${user.name}" (Default) - A base for other temporary directories.

.

Please check the values of above parameters defined in your core-site.xml/hdfs-site.xml

.

Ref:

https://hadoop.apache.org/docs/r2.7.3/hadoop-project-dist/hadoop-common/core-default.xml

The Default values are determined as mentioned in the link:

https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-...

        <property>
          <name>dfs.namenode.name.dir</name>
          <value>file://${hadoop.tmp.dir}/dfs/name</value>
          <description>Determines where on the local filesystem the DFS name node
              should store the name table(fsimage).  If this is a comma-delimited list
              of directories then the name table is replicated in all of the
              directories, for redundancy. </description>
        </property>

.

View solution in original post

balaram38489 · ‎03-04-2017

@Aruna,

delete all files and directories in /home/aruna/hadoop-2.7.3/hadoop2_data/hdfs/datanode

restart the cluster.

Still if you are having problem,

Please follow these steps

1. create the following directories in hadoop-2.7.3.

name

data

2. add the following lines in hdfs-site.xml

<property>
	<name> dfs.namenode.name.dir </name>
	<value>file://home/aruna/hadoop-2.7.3/name</value>
</property>

<property>
	<name>dfs.datanode.data.dir</name>
	<value>file://home/aruna/hadoop-2.7.3/data</value>
</property>

3. delete all log files in hadoop-2.7.3/logs

4. format namenode

5. start cluster

Still you have problem reply with log files

All the best

Cloudera Community

Support Questions

when try to Format namenode ,its format the tempory one