Difficult and miscellaneous problems: why should LInux dual Pacemaker switch when the system state is normal?

Last weekend, another problem occurred in our production. A set of system status was obviously normal, and there was no alarm on the monitoring, but Packmaker, the dual computer software of the CentOS operating system, initiated the switching. Because the log of the unit host involves sensitive information and cannot be connected to the externa ...

Posted on Fri, 19 Nov 2021 10:33:05 -0500 by jd57

Start learning big data again - hadoop - day46 Hdfs, yarn's HA, mapreduce

Start learning big data again - hadoop - day46 Hdfs, yarn's HA, mapreduce (1) Ha (high availability) HA for HDFS Compared with Hadoop 1. X, HDFS in Hadoop 2. X adds two important features, HA and Federation. Ha is High Availability, which is used to solve the single point of failure of NameNode. This feature provides a standby for the pr ...

Posted on Wed, 01 Sep 2021 19:20:23 -0400 by deras