This document summarizes Kathleen Ting's presentation on migrating to MapReduce v2 (MRv2) on YARN. The presentation covered the motivation for moving to MRv2 and YARN, including higher cluster utilization and lower costs. It then discussed common misconfiguration issues seen in support tickets, such as memory, thread pool size, and federation misconfigurations. Specific examples were provided for
The join optimizations described here were added in Hive version 0.11.0. See HIVE-3784 and related JIRAs. This document describes optimizations of Hive's query execution planning to improve the efficiency of joins and reduce the need for user hints. Hive automatically recognizes various use cases and optimizes for them. Hive 0.11 improves the optimizer for these cases: Joins where one side fits in
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