Even though there is no significant difference in the syntax of the commands or running applications, still there are some differences which both Administrators, as well as Developers, should be aware of. On a typical configuration cluster, we can connect to HDFS or YARN by using URI from the client. For Namenode URI originally look …
Let us review some of the important properties, YARN Resource Manager HA components etc. HA concepts related to YARN is also similar to HDFS. YARN Resource Manager HA is not very common. As part of YARN architecture, Resource Manager takes care of Resource Management and Job Scheduling. Job Execution Life Cycle is managed by per …
Let us see how to configure YARN Resource Manager High Availability using Cloudera Manager. Keep in mind that Namenode HA is critical and complex, others are neither as critical nor complicated. Go to the YARN service. Select Actions > Enable High Availability. A pop-up window will display showing remaining or eligible hosts for the standby …
Automatic failover relies on two additional components in an HDFS: a ZooKeeper quorum, and the ZKFailoverController process (abbreviated as ZKFC). In Cloudera Manager, the ZKFC process maps to the HDFS Failover Controller role. Apache ZooKeeper is a highly available service for maintaining small amounts of coordination data, notifying clients of changes in that data, and …
Let us see different components related to Namenode High Availability. You can refer to this nicely written article on Namenode HA as part of Hadoop 2.x. Zookeeper – We already have Zookeeper running on our cluster. It will be used as part of Namenode High Availability. Quorum Based Storage – Active Namenode writes to it and …
Now let us understand key concepts with respect to HDFS Namenode High Availability. Let us recap HDFS components before we get into HA. HDFS have Namenode, Secondary Namenode and Datanodes When data is saved in the form of files in HDFS Files will be divided into blocks and blocks are saved in Datanodes Mapping between …
HDFS Namenode HA – Quick Recap of HDFS typical Configuration Read More »
