Let us go through the overview of schedulers. YARN supports three types of Schedulers – FIFO Scheduler, Fair Scheduler, and Capacity Scheduler. FIFO Scheduler – default with plain vanilla Hadoop and typically used for exploratory purposes. Fair Scheduler – Resources will be allocated to all the subsequent jobs in Fair Manner, default with Cloudera distribution. Capacity Scheduler …
As part of this section, we will understand schedulers in YARN in detail. There are different schedulers – FIFO, Fair, and Capacity. Schedulers Overview FIFO Scheduler Introduction to Fair Scheduler Configure Fair Scheduler Fair Scheduler – examples Introduction to Capacity Scheduler Configure Capacity Scheduler Capacity Scheduler – examples
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 …
