NDLI: Taming Non-local Stragglers Using Efficient Prefetching in MapReduce

Content Provider	IEEE Xplore Digital Library
Author	Ze Yu Min Li Xin Yang Han Zhao Xiaolin Li
Copyright Year	2015
Abstract	MapReduce has been widely adopted as a programming model to process big data. However, parallel jobs in MapReduce are prone to be plagued by stragglers caused by non-local tasks for two reasons: first, system logs from production clusters show that a non-local task can be two times slower than a local task; second, a job's completion time is bottlenecked by its slowest parallel tasks. As a result, even one single non-local task can become the straggler of the whole job, causing significant delay of the whole job. In this paper, we propose to alleviate this problem by proactively prefetching input data for non-local tasks. However, performing such prefetching efficiently in MapReduce is difficult, because it requires both application-level information to generate accurate prefetching requests at runtime, and an appropriate network flow scheduling mechanism to guarantee the timeliness of prefetching flows. To address these challenges, we design and implement FlexFetch, which 1) leverages a novel mechanism called speculative scheduling to accurately generate prefetching flows, 2) explicitly allocates network resources to prefetching flows using a criticality-aware deadline-driven flow scheduling algorithm. We evaluate FlexFetch through both testbed experiments and large-scale simulations using production workloads. The results show that FlexFetch reduces the completion time by 41.8% for small jobs and 26.8% on average, compared with the default MapReduce implementation in Hadoop.
Starting Page	52
Ending Page	61
File Size	355490
Page Count	10
File Format	PDF
ISBN	9781467365987
DOI	10.1109/CLUSTER.2015.16
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-09-08
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Prefetching Resource management Delays Heart beat Facebook Complexity theory Bandwidth SDN MapReduce Non-local Straggler Prefetch
Content Type	Text
Resource Type	Article

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