How to Increase Replication Factor for a Kafka topic
Have you noticed that some topics in your Kafka cluster have a suboptimal replication factor? This could be due to initial setup, low traffic, or the product being in its…
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How to reload .bash_profile from the command line
Just sharing few commands to load a .bash_profile without exiting from terminal or command line [java] source ~/.bash_profile or do . ~/.bash_profile [/java]
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Inheritance hierarchies in Jackson
We will look at how class hierarchies in Jackson works. We will take an example of building a Notification Service Pojo to demonstrate this. Below is the package/class diagram for…
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Kafka Interview Questions
Here is a list of top Kafka interview question based on my exposure to Apache Kafka Kafka Basics What is Apache KafkaWhat are topics and partitions What are various components of…
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Gradle download sources and javadoc in eclipse or Intellij or Idea
For different workspace sources and javadoc from maven repo can be download as follows: Eclipse [java] apply plugin: 'java' apply plugin: 'eclipse' eclipse { classpath { downloadJavadoc = true downloadSources…
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Finding Ulimit of Process and a User
ulimit is a shell command to control the resources available to a bash shell and all the programs that are started from this shell. We can get and set the ulimit…
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Import SSL Certificates in trust store
First download certificate in java file [java] echo -n | openssl s_client -servername <hostname> -connect <hostname>:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /tmp/key.cert[/java] Import it using keytool command [java]keytool…
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Java SSL PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Sometime back I got below error while connecting to SSL secured site in java. I was using java 8 update 60. Why this error comes and how to resolve it.…
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Graceful shutdown of java process inside docker container
Recently faced an issue where the docker stop was not calling a shutdown hook was not working correctly. The same application when run as a spring boot applicaiton or jar…
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How to push as different user in github
Remove all existing keysGenerate ssh key for the current user which wants to commit to githubadd the ssh key for new userInitialise the new Repository Add the remote url ( here…
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