simply about difficult
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 […]
READ MORESuppose that you are faced with an exception like this: At first, you might think that java cannot find com.example.YourClass. But if you execute this line: Then it will work successfully and you will not see an exception. The point is that java sees the class, but a masked error occurred while initializing static fields […]
READ MOREIf you came to this page, it means that ZooKeeper began to take up a lot of space, and you need to find the reason. Mostly ephemeral data is stored in ZooKeeper. So at some time you asks the question – why the server began to consume so much disk space? The fact is that […]
READ MORESuppose 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 […]
READ MOREIn the previous article, we already figured out how to terminate a container with a specific exit code. To begin with, the return value must be smaller then 256. You can notice that: If you terminate the container with a code of 0 or some other positive number, then the same code will be sent […]
READ MOREYou need to mark container’s start class using the @YarnComponent and mark method with the @OnContainerStart annotations: Despite the fact that the description of the annotation says that it cannot return anything, the return value works. We make the return value of type int. 0 – means successful shutdown of the container, non-zero values – […]
READ MORESuppose that we have an SBY application, which includes AppMaster and Container. When the container falls due to an exception, we need to send exception text to the AppMaster. When the container falls, the AppMaster’s onContainerFailed() method is automatically called: The method is in the StaticEventingAppmaster class. Your AppMaster must be inherited from it. We […]
READ MOREIf you get an exception like this: Check this two things first: Is the path to the keytab correct? Does the process have permission to read the keyab? In my case it turned out that there was no keytab read permission in hdfs. Thanks Xavier Portebois.
READ MOREIf you encounter an exception like this: Then you most likely have a class InnerClass, which is declared inside BaseClass: And in some other class (even inherited from BaseClass) you are trying to instantiate InnerClass: Then you will get groovy.lang.GroovyRuntimeException: Could not find matching constructor. The point is that objects of inner classes in groovy need […]
READ MORELet’s imagine that you need to know the actual distribution of keys by regions of the HBase table. There is no direct way to find it. But you can use this workaround: you need to send scan queries with region boundaries: This code will display line by line the number of keys in each region of the […]
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