Debugging HBase: org.apache.hadoop.hbase.master.AssignmentManager: Unable to find a viable location to assign region -ROOT

Introduction

I ran into an annoying error in HBase due to the localhost loopback. The solution was simple, but took some trial and error.

Error

I was following the HBase logs with the following command:

tail -1000f /var/log/hbase/hbase-hbase-master-freshstart.log

The following error kept poping up in the log file.

org.apache.hadoop.hbase.master.AssignmentManager: Unable to find a viable location to assign region -ROOT

Solution

sudo vi /etc/hosts

I changed:


127.0.0.1       localhost
127.0.1.1       freshstart

to:


#127.0.0.1      localhost
#127.0.1.1      freshstart
192.168.2.15   freshstart
127.0.0.1      localhost

192.168.2.15 is my internal IP address, and freshstart is my hostname.

At this point I rebooted as a quick and dirty way to restart all Hadoop / HBase services. Alternatively, you can start/stop all services.

Additional Thoughts

Updating the hosts file is an option for me currently since I have everything installed on a single machine. However, it seems that this error is a name resolution related issue, so a properly configured DNS server is likely necessary when deploying Hadoop / HBase in a production cluster.

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