Failed to restart Hadoop namenode using cloudera quickstart

Question

I use Windows 8 with a cloudera-quickstart-vm-5.4.2-0 virtual box. I am wanting to put a "words.txt" file in the HDFS. I got a connection exception.

I checked other StackOverflow threads/solutions and tried the following:

I checked the status of the namenode and datanode.
It seems that the namenode is dead while the datanode is running.
I restarted the namenode, but it is still not running.

Here is a screenshot of the terminal using showing all the steps: terminal.png

I have no clue what to do next in order to solve the problem I have.

Note: I am new to Hadoop, so I am not familiar with most of the technical terms associated with it. A descriptive solution is very much appreciated.

I am completely new to Hadoop, so I unfortunately don't know now to check the log of the namenode. Could you help me with that? I am very curious to check out the log. — HihaSpyKnocker
– HihaSpyKnocker, Commented Jan 5, 2018 at 13:42
Any reason you're not using Cloudera Manager to restart your NameNode? And BTW, your log file is listed in your screenshot: /var/log/hadoop-hdfs/hadoop-hdfs-namenode-quickstart.cloudera.out — tk421
– tk421, Commented Jan 5, 2018 at 20:49
I fixed my problem using this link: kshitish-bigdata.blogspot.nl/2015/02/… — HihaSpyKnocker
– HihaSpyKnocker, Commented Jan 6, 2018 at 15:29

HihaSpyKnocker · Accepted Answer · 2018-01-07 10:33:59Z

Fixed my own problem

Check status of all services: for service in /etc/init.d/hadoop-hdfs-*; do $service status; done; , output should be:

Hadoop datanode is running [  OK  ]  
Hadoop namenode is dead and pid file exists [FAILED]  
Hadoop secondarynamenode is running  [  OK  ]

To get the namenode running do the following:

stop all services: for service in /etc/init.d/hadoop-hdfs-*; do $service stop; done;
clear cache from cache directory: sudo rm -rf /var/lib/hadoop-hdfs/cache/*
reformat name node: sudo -u hdfs hdfs namenode -format
start all services: for service in /etc/init.d/hadoop-hdfs-*; do $service start; done;
check status: for service in /etc/init.d/hadoop-hdfs-*; do $service status; done;

Result should be:

Hadoop datanode is running [  OK  ]  
Hadoop namenode is running [  OK  ]  
Hadoop secondarynamenode is running [  OK  ]

As described in the following link:

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