- Hadoop MapReduce v2 Cookbook（Second Edition）
- Thilina Gunarathne
- 92字
- 2021-07-23 20:32:56
Chapter 3. Hadoop Essentials – Configurations, Unit Tests, and Other APIs
In this chapter, we will cover:
- Optimizing Hadoop YARN and MapReduce configurations for cluster deployments
- Shared user Hadoop clusters – using Fair and Capacity schedulers
- Setting classpath precedence to user-provided JARs
- Speculative execution of straggling tasks
- Unit testing Hadoop MapReduce applications using MRUnit
- Integration testing Hadoop MapReduce applications using MiniYarnCluster
- Adding a new DataNode
- Decommissioning DataNodes
- Using multiple disks/volumes and limiting HDFS disk usage
- Setting the HDFS block size
- Setting the file replication factor
- Using the HDFS Java API
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