Connection issues in Cassandra and HBase

What is Apache Cassandra?




Cassandra is an open-source, distributed, Not Only SQL database management system designed to handle a large amount of across data.

How to install Cassandra?Cassandra simple to install on Ubuntu/Linux with step by step processing and why should be using Apache Cassandra in Data handled:

Install Cassandra on ubuntu linux

What is Apache HBase?

Hadoop + DataBase runs on top of Hadoop eco-system. It is a Database which is an open-source, distributed, NoSQL database related. It provides random access and data stores in HDFS files that are indexed by key, values

How to install Apache HBase on Linux/Ubuntu system?

It is simple to the installation of HBase on the Linux operating system with step by step processing.
Installation of HBase on Ubuntu

Cassandra Connection error:

Error: Exception encountered during startup

java.lang.Illegal exceptionArgumentException is already in reerseMap to (Username)

at org.apache.cassandra.utils.concurrentBiMap.put(concurrentBiMap.java:97)

at org.apache.cassandra.config.schema.load(schema.java:406)

at org.apache.cassandra.config.schema.load(schema.java:117)

HBase Connection Error:

Client.ConnectionManager$HConnection Implementation: Can't get  connection to Zookeeper service connection loss for /hbase

After installation of Cassandra and HBase services on top of Hadoop Eco-system I got this type of error.  Anyone have found resolution please post it here

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