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Hadoop Pit--Unable to start Namenode

Source: Internet
Author: User
Keywords Hadoop unable to start namenode tmp file
Tags create default directory file hadoop home directory information start
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Recently encountered a problem, the implementation of start-all.sh found JPS Namenode did not start

You have to reformat the namenode every time you turn it on.

In fact, the problem is in the TMP file, the default TMP file will be emptied every time it is restarted, while the Namenode formatting information will be lost

So we have to reconfigure a TMP file directory

First, create a hadoop_tmp directory under the home directory

sudo mkdir ~/hadoop_tmp

Then modify the Core-site.xml file in the hadoop/conf directory and add the following nodes:

Hadoop.tmp.dir

/home/chjzh/hadoop_tmp

A base for the other temporary directories.

Note: My user is Chjzh so the directory is/home/chjzh/hadoop_tmp

OK, reformat Namenode

Hadoop Namenode-format

And then start Hadoop.

start-all.sh

Execute the JPS command to see Namenode.

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Related Keywords:
hadoop format namenode namenode and datanode in hadoop hadoop how to start how to start hadoop unable to start server unable to start java unable to start sql server
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