Towards Automatic Optimization of MapReduce Programs (Position Paper) Shivnath Babu Duke University
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1 Towards Automatic Optimization of MapReduce Programs (Position Paper) Shivnath Babu Duke University
2 Roadmap Call to action to improve automatic optimization techniques in MapReduce frameworks Challenges & promising directions Pig Hive JAQL Hadoop HDFS
3 Lifecycle of a MapReduce Job Map function Reduce function Run this program as a MapReduce job
4 Lifecycle of a MapReduce Job Map function Reduce function Run this program as a MapReduce job
5 Lifecycle of a MapReduce Job Time Input Splits Map Wave 1 Map Wave 2 Reduce Wave 1 Reduce Wave 2 How are the number of splits, number of map and reduce tasks, memory allocation to tasks, etc., determined?
6 Job Configuration Parameters 190+ parameters in Hadoop Set manually or defaults are used Are defaults or rules-ofthumb good enough?
7 Running time (minutes) Running time (minutes) Running time (seconds) Running time (seconds) Experiments On EC2 and local clusters
8 Illustrative Result: 50GB Terasort 17-node cluster, concurrent map+reduce slots mapred.reduce. tasks io.sort. factor io.sort.record. percent Running time Based on popular rule-ofthumb Performance at default and rule-of-thumb settings can be poor Cross-parameter interactions are significant
9 Complexity Space of execution choices Problem Space Multi-job workflows Declarative HiveQL/Pig operations Job configuration parameters Energy considerations Cost in pay-as-you-go environment Performance objectives Current approaches: Predominantly manual Post-mortem analysis Is this where we want to be?
10 Can DB Query Optimization Technology Help? MapReduce Query job Optimizer: Enumerate Cost Search Good setting plan of parameters Database Execution Hadoop Engine Results But: MapReduce jobs are not declarative No schema about the data Impact of concurrent jobs & scheduling? Space of parameters is huge Can we: Borrow/adapt ideas from the wide spectrum of query optimizers that have been developed over the years Or innovate! Exploit design & usage properties of MapReduce frameworks
11 Spectrum of Query Optimizers Conventional Optimizers Cost models + statistics about data Rulebased AT s Conjecture: Rule-based Optimizers (RBOs) will trump Cost-based Optimizers (CBOs) in MapReduce frameworks Insight: Predictability(RBO) >> Predictability(CBO)
12 Spectrum of Query Optimizers Conventional Optimizers Cost models + statistics about data Rulebased Learning Optimizers (learn from execution & adapt) Tuning Optimizers (proactively try different plans) AT s Conjecture: Rule-based Optimizers (RBOs) will trump Cost-based Optimizers (CBOs) in MapReduce frameworks Insight: Predictability(RBO) >> Predictability(CBO)
13 Spectrum of Query Optimizers Conventional Optimizers Cost models + statistics about data Rulebased Learning Optimizers (learn from execution & adapt) Tuning Optimizers (proactively try different plans) Exploit usage & design properties of MapReduce frameworks: High ratio of repeated jobs to new jobs Schema can be learned (e.g., Pig scripts) Common sort-partition-merge skeleton Mechanisms for adaptation stemming from design for robustness (speculative execution, storing intermediate results) Fine-grained and pluggable scheduler
14 Summary Call to action to improve automatic optimization techniques in MapReduce frameworks Automated generation of optimized Hadoop configuration parameter settings, HiveQL/Pig/JAQL query plans, etc. Rich history to learn from MapReduce execution creates unique opportunities/challenges
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