It is recommended to check if your cluster computing power is insufficient. Often, such errors occur when memory or CPU resources are insufficient. ... View more

Did you know that Nifi was developed in the Java language? Pure Java cannot handle Windows event logs. The method using JNA is recommended. Please refer to the following link.   https://code.dblock.org/2010/09/30/jna-reading-windows-event-log-entries-in-java.html ... View more

Ambari installation requires either MySQL or postgresql. In general, you only need to install MySQL on the Ambari server host.   https://docs.cloudera.com/HDPDocuments/Ambari-2.7.5.0/administering-ambari/content/amb_using_ambari_with_mysql_or_mariadb.html ... View more

Please visit the following link. Good luck.   https://zeppelin.apache.org/docs/0.8.0/usage/rest_api/interpreter.html#restart-an-interpreter ... View more

In my opinion, there seems to be a problem running the interpreter due to insufficient memory. First check if there is insufficient memory by monitoring the system. ... View more

I recommend not using nifi and working with the console. Using nifi is not recommended because additional logs are generated. It is recommended to divide and compress the files that you want to move from the console into appropriate sizes and send them. For HDFS, you can use the distcp command.   https://hadoop.apache.org/docs/current/hadoop-distcp/DistCp.html   ... View more

In my experience, lack of computer resources was the biggest cause. It is always necessary to prepare disks and memory with sufficient space. ... View more

HDP2.6 uses java 7 and HDP 3.1.5 uses java 8. If you want to write a program that works for both versions, you can use the compile option to run on java 7. ... View more

"jps" is the "ps" java version. Most Hadoop processes are developed as Java programs, and the command to view the Java process status is jps.   https://docs.oracle.com/javase/7/docs/technotes/tools/share/jps.html ... View more