How Apache Hadoop YARN HA Works | Cloudera Engineering Blog



How Apache Hadoop YARN HA Works | Cloudera Engineering Blog

YARN, the next-generation compute and resource management framework in Apache Hadoop, until recently had a single point of failure: the ResourceManager, which coordinates work in a YARN cluster. With planned (upgrades) or unplanned (node crashes) events, this central service, and YARN itself, could become unavailable.

This post details Cloudera's recent work in the Hadoop community (YARN-149) to make the ResourceManager (and thus YARN) highly available. We'll also explain the high-level design for how the ResourceManager's active state is preserved (state store), and how ResourceManagers fail-over to achieve high availability (HA). We also outline how to deploy an HA cluster, and review some important configuration options.

Background

CDH 5 (and Apache Hadoop 2.x) ship YARN as the vehicle to manage cluster resources, and share the said resources among compute frameworks like MapReduce, Impala, and Apache Spark. In previous posts, you have learned the high-level architecture of YARN, and how to migrate from MR1 to MR2/YARN for users and cluster admins.

To briefly re-cap, YARN has a master/worker architecture (see below); the master (the ResourceManager) manages the resources on the workers and schedules work in the cluster. Furthermore, the ResourceManager handles all client interactions.


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