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2016 IEEE 22nd International Conference on Parallel and Distributed Systems (ICPADS) (2016)
Wuhan, Hubei, China
Dec. 13, 2016 to Dec. 16, 2016
ISSN: 1521-9097
ISBN: 978-1-5090-4457-3
pp: 535-544
Online graph analytics and large-scale interactive applications such as social media networks require low-latency data access to billions of small data objects. These applications have mostly irregular access patterns making caching insufficient. Hence, more and more distributed in-memory systems are proposed keeping all data always in memory. These in-memory systems are typically not optimized for the sheer amount of small data objects, which demands new concepts regarding the local and global data management and also the fault-tolerance mechanisms required to mask node failures and power outages. In this paper we propose a novel two-level logging architecture with backup-side version control enabling parallel recovery of in-memory objects after node failures. The presented fault-tolerance approach provides high throughput and minimal memory overhead when working with many small objects. We also present a highly concurrent log cleaning approach to keep logs compact. All proposed concepts have been implemented within the DXRAM system and have been evaluated using two benchmarks: The Yahoo! Cloud Serving Benchmark and RAMCloud's Log Cleaner benchmark. The experiments show that our proposed approach has less memory overhead and outperforms state-of-the-art in-memory systems for the target application domains, including RAMCloud, Redis, and Aerospike.
Random access memory, Distributed databases, Throughput, Peer-to-peer computing, Memory management, Java, Fault tolerance

K. Beineke, S. Nothaas and M. Schoettner, "High Throughput Log-Based Replication for Many Small In-Memory Objects," 2016 IEEE 22nd International Conference on Parallel and Distributed Systems (ICPADS), Wuhan, Hubei, China, 2016, pp. 535-544.
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