HDFS DELEGATION TOKEN can’t be found in cache

The problem can be appears in Hadoop’s NodeManager logs. Usually it means that NodeManager is trying to use an expired / not renewed HDFS delegation token. For example, you can face this error while app log aggregation process. The timeline is: Your application pass HDFS delegation token to the NodeManager through the ContainerLaunchContext class, because […]

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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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KeeperErrorCode = ConnectionLoss for /hbase/hbaseid

IMPORTANT! If you trying to install Apache Atlas and receiving this error, there is a separate article: https://mchesnavsky.tech/apache-atlas-building-installing/ Suppose that we are faced with these exceptions. The first: The second: The third: The hbase-client cannot connect to the Zookeeper. You need to pay attention to the address: If there is a real Zookeeper instance at […]

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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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