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CODA: Toward Automatically Identifying and Scheduling Coflows in the Dark

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CODA: Toward Automatically Identifying and Scheduling Coflows in the Dark CODA: Toward Automatically Identifying and Scheduling COflows in the DArk Hong Zhang1 Li Chen1 Bairen Yi1 Kai Chen1 Mosharaf Chowdhury2 Yanhui Geng3 1SING Group, Hong Kong University of Science and Technology 2University of Michigan 3Huawei {hzhangan,lchenad,biy,kaichen}@cse.ust.hk, [email protected], [email protected] ABSTRACT ing coflows [22] can significantly improve the communica- 1 Leveraging application-level requirements using coflows has tion performance of distributed data-parallel applications. recently been shown to improve application-level communi- Unlike the traditional flow abstraction, a coflow captures a cation performance in data-parallel clusters. However, exist- collection of flows between two groups of machines in suc- ing coflow-based solutions rely on modifying applications to cessive computation stages, where the communication stage extract coflows, making them inapplicable to many practical finishes only after all the flows have completed [23, 26]. A scenarios. typical example of coflow is the shuffle between the map- In this paper, we present CODA, a first attempt at automati- pers and the reducers in MapReduce [28]. By taking a holis- cally identifying and scheduling coflows without any applica- tic, application-level view, coflows avoid stragglers and yield tion modifications. We employ an incremental clustering al- benefits in terms of scheduling [21, 23, 24, 30], routing [68], gorithm to perform fast, application-transparent coflow iden- and placement [38]. tification and complement it by proposing an error-tolerant However, extracting these benefits in practice hinges on coflow scheduler to mitigate occasional identification errors. one major assumption: all distributed data-parallel applica- Testbed experiments and large-scale simulations with pro- tions in a shared cluster – be it a platform-as-a-service (PaaS) duction workloads show that CODA can identify coflows with environment or a shared private cluster – have been modified over 90% accuracy, and its scheduler is robust to inaccura- to correctly use the same coflow API. cies, enabling communication stages to complete 2:4× (5:1×) Unfortunately, enforcing this requirement is infeasible in faster on average (95-th percentile) compared to per-flow mech- many cases. As a first-hand exercise, we have attempted to anisms. Overall, CODA’s performance is comparable to that update Apache Hadoop 2.7 [58] and Apache Spark 1.6 [65] to of solutions requiring application modifications. use Aalo’s coflow API [24] and faced multiple roadblocks in three broad categories (x5): the need for intrusive refactoring, mismatch between blocking and non-blocking I/O APIs, and CCS Concepts involvement of third-party communication libraries. •Networks ! Cloud computing; Given that users on a shared cluster run a wide variety of data analytics tools for SQL queries [3,4,7, 15, 41, 63], log Keywords analysis [2, 28, 65], machine learning [33, 43, 48], graph pro- cessing [34, 44, 46], approximation queries [7, 12], stream Coflow; data-intensive applications; datacenter networks processing [9, 11, 13, 50, 66], or interactive analytics [7, 65], updating one application at a time is impractical. To make 1 Introduction things worse, most coflow-based solutions propose their own API [23, 24, 30]. Porting applications back and forth between A growing body of recent work [21, 23, 24, 30, 38, 68] has environments and keeping them up-to-date with evolving li- demonstrated that leveraging application-level information us- braries is error-prone and infeasible [54, 57]. Therefore, we ponder a fundemantal question: can we au- Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or tomatically identify and schedule coflows without manually distributed for profit or commercial advantage and that copies bear this notice updating any data-parallel applications? It translates to three and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is per- key design goals: mitted. To copy otherwise, or republish, to post on servers or to redistribute to • Application-Transparent Coflow Identification We must lists, requires prior specific permission and/or a fee. Request permissions from [email protected]. be able to identify coflows without modifying applications. SIGCOMM ’16, August 22–26, 2016, Florianopolis, Brazil c 2016 ACM. ISBN 978-1-4503-4193-6/16/08. $15.00 1We use the terms application and framework interchangeably in this paper. DOI: http://dx.doi.org/10.1145/2934872.2934880 Users can submit multiple jobs to each framework. Misidentified flow • Error-Tolerant Coflow Scheduling Coflow identification C1 C cannot guarantee 100% accuracy. The coflow scheduler 2 must be robust to some identification errors. C1 C2 • Readily Deployable The solution must be compatible with Misidentified flow Time existing technologies in datacenter environments. Identification Scheduling In this paper, we provide a cautiously optimistic answer via Figure 1: Motivating example: a coflow scheduler (e.g., Aalo [24]) CODA. At the heart of CODA is an application-transparent tends to optimize the CCT by prioritizing the small coflow C1 over coflow identification mechanism and an error-tolerant coflow the large coflow C2. However, a misidentified flow of C1 will be scheduling design. scheduled together with C2, significantly affecting the CCT of its For coflow identification, we apply machine learning tech- parent coflow C1. niques over multi-level attributes without manually modify- CODA Master x ing any applications ( 3). Besides explicit attributes directly Application-Transparent Identifier Error-Tolerant Scheduler retrieved from flows (e.g., arrival times and packet headers), we further explore implicit attributes that reflect communica- Online Incremental Clustering Late Binding tion patterns and data-parallel framework designs. As to the Inter-Coflow Prioritization identification algorithm, we find that traditional traffic clas- Offline Distance sification methods [17, 19, 29, 40, 47, 49, 51, 55, 67] do not Attribute Metric directly apply in our case. This is because coflows capture a Exploration Learning Intra-Coflow Prioritization one-off, mutual relationship among some flows that cannot be pre-labeled and need timely identification. To this end, we first identify DBSCAN [31] as the base algorithm that fits our CODA Agent(s) requirements, and then we develop an incremental version of Gather and Prune Enforce Coflow Rough-DBSCAN [59] that provides fast identification with Flow Information Schedule high accuracy. NIC Despite its high accuracy, CODA’s identifier is not perfect, Figure 2: CODA architecture: CODA agents collect flow-level in- and identification errors are unavoidable in practice. Such er- formation, and CODA master periodically updates coflow sched- rors, if present, may greatly affect the performance of existing ules using application-transparent identification and error-tolerant coflow schedulers. Consider Figure1 as an example: a mis- scheduling mechanisms. classified flow can significantly affect the coflow completion inspect CODA (x6.3 and x6.4). CODA’s identifier achieves time (CCT) of its parent coflow. over 90% accuracy for Spark, Hadoop, and mixed workloads, The key to CODA’s effectiveness lies in developing a ro- and provides significant speedup over vanilla DBSCAN. In bust scheduler that can tolerate such errors (x4). For error- terms of error-tolerant scheduling, we show that CODA can tolerant coflow scheduling, we start by studying how identi- effectively tolerate misidentifications over a wide range of fication errors would influence scheduling results. Our analy- scenarios. For example, in a challenging case with less than sis reveals that stragglers significantly affect CCT, and recent 60% identification accuracy, CODA’s error-tolerant design coflow schedulers [23, 24] suffer performance degradation in brings up to 1:16× speedup in CCT, reducing the impact the presence of errors. Thus, CODA employs late binding to of errors by 40%. Overall, CODA achieves the performance delay the assignment of flows to particular coflows until they comparable to that of prior solutions using manual annota- must be scheduled to minimize the impact of stragglers. Fur- tions in many cases. thermore, we find that intra-coflow prioritization [14, 16, 37, 62] can play a crucial role in the presence of identification errors. Hence, unlike existing coflow schedulers [21, 23, 24, 2 CODA Overview 30], CODA combines per-flow (intra-coflow) prioritization The goal of CODA is to design an identifier-scheduler joint with inter-coflow scheduling. solution that works “in the dark”, relying only on externally We have implemented a CODA prototype (x5) and built observable coflow attributes that can be collected from the a small-scale testbed with 40 servers to evaluate its perfor- network without modifying applications/frameworks. mance (x6.2). Our implementation experience shows that CODA Figure2 presents an overview of CODA system architec- can be readily deployed in today’s commodity datacenters ture. At a high level, it contains a central CODA master that with no modifications to switch hardware or application soft- performs the primary role of coflow identification and schedul- ware. By replaying a coflow benchmark based on Facebook ing every 4 interval (e.g., 10 − 100ms), as well as a CODA traces [5], we show that CODA achieves over 95% accuracy agent on each end host that collects aggregated flow-level in-
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