Problem scenario
You try to run an ant command. But you get this error: ‘Target “release” does not exist in the project “apache-cassandra”‘
What should you do?
Solution
Omit the word “release” when you run the ant command.
…
Problem scenario
You want to install and configure Apache Camel from source on any distribution of Linux. What do you do?
Solution
You cannot. But there is a way to use Apache Camel as a test.
Background: It is not something that is can be purely installed-and-configured like other applications. Camel is a framework for integrating messaging solutions or microservice architecture.
…
Continue reading “How Do You Install and Configure Apache Camel on a Linux Server?”
Problem scenario
You run this command:
sudo /opt/maven/bin/mvn activemq-perf:broker -Durl=broker:tcp://localhost:61616
You get this result:
[INFO] Scanning for projects…
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml
Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml (14 kB at 17 kB/s)
Downloaded from central: https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml (20 kB at 25 kB/s)
[INFO] ————————————————————————
[INFO] BUILD FAILURE
[INFO] ————————————————————————
[INFO] Total time: 1.815 s
[INFO] Finished at: 2020-04-28T15:33:05Z
[INFO] ————————————————————————
[ERROR] No plugin found for prefix ‘activemq-perf’ in the current project and in the plugin groups [org.apache.maven.plugins, …
Problem scenario
You want to set up Apache Kafka with a single broker just to test out. How do you do this on any distribution of Linux?
Prerequisite
You must install Zookeeper. If you need assistance, see this posting.
You may want to install screen because this solution will rely on it; you could open duplicate terminals instead of using the screen command.
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Continue reading “How Do You Set Up Apache Kafka on Any Distribution of Linux?”
Problem scenario
You used a .json file and the AWS CLI to configure customized metrics. When you go to the GUI you do not see the graphs. The commands that were run with the .json file completed without errors or problems. How do you get the web console to show the metrics you configured for various AWS components?
Possible Solution #1
CloudWatch metrics are not all necessarily graphed.
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Continue reading “What Do You Do If CloudWatch Metrics Are Not Showing Up in the Dashboard?”
Problem scenario
You deployed Apache Mesos. The web UI is having problems. You see the error “Failed to connect to x.x.x.x:5050.” What should you do?
Solution
- Go to the back-end of the Apache Mesos server. Run this command: sudo systemctl stop mesos-master
- sudo find / -name mesos-master.sh
- Change directory into the parent of the “bin” directory that houses the mesos-master.sh as found above.
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Problem scenario
You have Hadoop installed on a Linux machine. You want to install Apache Sqoop. What do you do?
Solution
Prerequisite
Verify one of these commands work:
hadoop dfs -ls
or
hdfs dfs ls
# If you need assistance installing Hadoop, see this posting.
Procedures
Download the installation media here: http://www.apache.org/dyn/closer.cgi/sqoop/
There are other sources.
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Problem scenario
You are trying to install open source Accumulo on Linux. You have two GB of swap space. You have installed Java, Hadoop, and Zookeeper. You have run the bootstrap_config.sh script for Accumulo 1.9.2.
You run this (and expected it to work): /bin/accumulo-1.9.2/bin/accumulo init
But you get this error:
OpenJDK 64-Bit Server VM warning: If the number of processors is expected to increase from one, …
Continue reading “How Do You Troubleshoot the Installation of Apache Accumulo on Linux?”
Problem scenario
You want to set up Zookeeper with three nodes in AWS. What do you do?
Solution
1. Install Zookeeper on each of the servers. If you need assistance with this, see this posting.
2. Modify the zoo.cfg file on each of the servers. Add stanzas like these but substitute foobarX.amazonaws.com with the Public DNS name of each server:
server.1=foobar1.amazonaws.com:2888:3888
server.2=foobar2.amazonaws.com:2888:3888
server.3=foobar3.amazonaws.com:2888:3888
initLimit=5
syncLimit=5
3.
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Continue reading “How Do You Set Up a Multi-Node Cluster of Zookeeper?”
Problem scenarios
One of the following apply to you.
Problem #1
You run an HBase command but it hangs indefinitely, and there is no error. What could be the problem?
Problem #2
You run an HBase command but you see this:
“ERROR: KeeperErrorCode = ConnectionLoss for /hbase/master”
Solution
Has Zookeeper been started?
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Continue reading “How Do You Troubleshoot HBase Commands That Hang?”