A Technical I.T./DevOps Blog
Problem scenario
You start Cassandra with this command: ./bin/cassandra
You see one of the following messages:
INFO [MigrationStage:1] 2018-04-06 19:01:07,144 ColumnFamilyStore.java:391 – Initializing system_auth.resource_role_permissons_index
INFO [MigrationStage:1] 2018-04-06 19:01:07,163 ColumnFamilyStore.java:391 – Initializing system_auth.role_members
No progress is happening. What should you do?
Solution
Possible Solution #1. Try rebooting the server. This could help the problem.
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Problem scenario
When you start Cassandra you see a message such as this:
INFO [main] 2018-02-03 08:45:55,257 ColumnFamilyStore.java:389 – Initializing system.IndexInfo
What should you do?
Possible Solution #1
Try rebooting the server. This could help the problem.
Possible Solution #2
This next one is merely a workaround. It is not a best practice.
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Continue reading “What Do You Do when Cassandra Stalls on “Initializing IndexInfo”?”
This is a list of books focusing on message queuing solutions other than RabbitMQ. For RabbitMQ, see this link.
AMQP PREDICTIVE ANALYTICS REPORT by Gerard Blokdijk
ActiveMQ in Action by Bruce Snyder, Dejan Bosanac and Rob Davies
Code Connected Volume 1: Learning ZeroMQ by Pieter Hintjens
Programming WebSphere MQ with JAVA by Kunal Jaggi
ZeroMQ: Messaging for Many Applications by Faruk Akgul
ZeroMQ: Messaging for Many Applications by Pieter Hintjens
Problem Scenario
You want to install Apache Rya on Linux. What do you do?
Solution
Prerequisites
i. You need a server with at least 5 GB of total memory. You can create swap space with this posting. (Remember that 1 GB of RAM and 2 GB of swap space will be insufficient for installing Rya.)
ii.
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Continue reading “How Do You Install Apache Rya on Any Distribution of Linux?”
Problem scenario
You are running Ant and you get this error:
“Unable to load a script engine manager (org.apache.bsf.BSFManager or javax.script.ScriptEngineManager”
What should you do?
Solution
Uninstall Ant (e.g., sudo apt-get -y remove ant). Install the latest version of Ant. If you need directions, see this posting as it works on any distribution of Linux.
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Problem Scenario
You have installed Apache Cassandra on Linux. It is deployed as a single node configuration (not a cluster). When you run “cqlsh” you get this error:
“Connection error: (‘Unable to connect to any servers’, {‘127.0.0.1’: error(111, “Tried connecting to [(‘127.0.0.1’, 9042)]. Last error: Connection refused”)})”
How do you troubleshoot cqlsh when you get this message “”Tried connecting to [(‘127.0.0.1’, 9042)].
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Continue reading “How Do You Troubleshoot the Cassandra Problem about “Connection refused”?”
Updated on 5/14/20 with a minor update on 11/13/21
Problem scenario
You want to install Apache Zookeeper with a script. You want the same script to work regardless of what distribution of Linux you are using (e.g., Ubuntu/Debian, RedHat (including CentOS/Fedora), or SUSE). How do you write a script to install the latest version of Zookeeper?
Solution
The file that is attached called zki.txt is not needed but is attached as a reference copy of the below.
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Continue reading “How Do You Install Zookeeper on Any Type of Linux?”
Problem scenario
You are running Linux SUSE and want to install Apache Cassandra. How do you install Apache Cassandra on Linux SUSE?
Solution
Prerequisites
i. This solution assumes that you have Java installed. If you need assistance, see this link.
ii. This solution assumes your server has a total of 2.5 GB of memory (a combination of either virtual memory or RAM).
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Continue reading “How Do You Install Apache Cassandra on Linux SUSE?”
Problem scenario
You are running Ubuntu 16.x Linux and want to install Apache Cassandra. How do you install Apache Cassandra on Linux Ubuntu Linux as a single-server configuration?
Solution
These directions will work to deploy Debian 9 Linux too. They have been tested to work in AWS and GCP.
Prerequisites
i. This solution assumes that you have installed Apache Ant and Git.
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Continue reading “How Do You Install Apache Cassandra on Ubuntu 16.04?”
Problem scenario
You want to install Apache Cassandra on CentOS, RHEL, or Fedora Linux. What do you do?
Solution
These directions will deploy Apache Cassandra in a solo-server configuration. This will not create a cluster. These directions will work for a physical server, a VM, an EC-2 instance in AWS or a virtual machine in GCP.
Prerequisites
i. This assumes that you have 3 GB of memory (in combination of either RAM or virtual memory,
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Continue reading “How Do You Install Apache Cassandra on a RedHat Derivative of Linux?”