ZooKeeper recursive watcher

If you need to set up a recursive watchers (watch on all nodes), the standard ZooKeeper’s Watcher class will not help much – it is installed on only 1 node (or one-level-forward when you calling getChildren()), and is also a one-time event. This means that after each watch trigger, you need to install a new […]

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How to immediately terminate the Spring Boot Yarn container with an error

Imagine an error or exception occurs while running the Spring Boot Yarn container, and we need to kill container from itself and return an error code. You can use @OnContainerStart annotation as mentioned in this article: https://mchesnavsky.tech/how-to-set-up-exit-code-on-spring-boot-yarn-container. But if we need to stop the container immediately, we just need to call: – where parameter is […]

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IgniteException: Work directory does not exist

Suppose that when starting the application, you encounter the following exception: It is assumed, that the /tmp/ignite/work directory is located on the local file system. If the application is running on a cluster, then Ignite will try to create such a folder on each node of the cluster. Exception reasons: The account under which the […]

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How to run HBase utility class from Java

Suppose you need to run HBase utility class from Java code. Such a class will have a main() method, which we will use. For demonstrating, we will use RowSplitter class. Firstly, we need to add the hbase-server module (for example, version 1.2.3) to pom.xml: In some our own class, let’s call RegionSplitter’s main(): If you […]

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