Florianópolis, Santa Catarina, Brasil
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Experienced backend software engineer with years of expertise in deg scalable APIs,…

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  • Achieving Enhanced Performance Combining Checkpointing and Dynamic State Partitioning

    IEEE - Institute of Electrical and Electronics Engineers

    Fault-tolerant systems rely on recovery techniques to enhance system resilience. In this regard, checkpointing procedures periodically take snapshots of the system state during failure-free operation, enabling recovery processes to resume from a previously saved, consistent state. Saving checkpoints, however, is costly, as it must synchronize snapshots with the processing of incoming requests to avoid inconsistency. One way to speed up checkpointing is to partition the service state, allowing a…

    Fault-tolerant systems rely on recovery techniques to enhance system resilience. In this regard, checkpointing procedures periodically take snapshots of the system state during failure-free operation, enabling recovery processes to resume from a previously saved, consistent state. Saving checkpoints, however, is costly, as it must synchronize snapshots with the processing of incoming requests to avoid inconsistency. One way to speed up checkpointing is to partition the service state, allowing a parallel checkpoint procedure to operate independently on each partition. State partitioning can also improve throughput by increasing parallelism in request processing. However, variations in the data access pattern over time can result in unbalanced partitions, posing a challenge to achieving optimal performance. In this paper, aiming to improve both checkpointing and overall system performance, we combine parallel checkpointing with a dynamic graph-based repartitioning algorithm. This work formalizes the optimization problem and presents a detailed performance assessment of the proposed approach. The experimental evaluation highlights the benefits of parallel checkpointing and emphasizes the performance gains achieved with repartitioning under realistic workloads. Comparing a cost-effective round-robin partitioning approach with our dynamic method, we examine the degree of execution parallelism achieved by checkpointing threads and the influence of repartitioning strategies on checkpoint performance. Although the rebalancing of state partitions incurs a cost, it comes for free in our technique since it takes advantage of processing idleness during the snapshot-taking process.

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  • Checkpointing Techniques in Distributed Systems: A Synopsis of Diverse Strategies Over the Last Decades

    Sociedade Brasileira de Computação

    This paper concisely reviews checkpointing techniques in distributed systems, focusing on various aspects such as coordinated and uncoordinated checkpointing, incremental checkpoints, fuzzy checkpoints, adaptive checkpoint intervals, and kernel-based and -space checkpoints. The review highlights interesting points, outlines how each checkpoint approach works, and discusses their advantages and drawbacks. It also provides a brief overview of the adoption of checkpoints in different contexts…

    This paper concisely reviews checkpointing techniques in distributed systems, focusing on various aspects such as coordinated and uncoordinated checkpointing, incremental checkpoints, fuzzy checkpoints, adaptive checkpoint intervals, and kernel-based and -space checkpoints. The review highlights interesting points, outlines how each checkpoint approach works, and discusses their advantages and drawbacks. It also provides a brief overview of the adoption of checkpoints in different contexts in distributed computing, including Database Management Systems (DBMS), State Machine Replication (SMR), and High-Performance Computing (HPC) environments. Additionally, the paper briefly explores the application of checkpointing strategies in modern cloud and container environments, discussing their role in live migration and application state management. The review offers valuable insights into their adoption and application across various distributed computing contexts by summarizing the historical development, advances, and challenges in checkpointing techniques.

    DOI: https://doi.org/10.5753/wtf.2023.785

    Qualis: A4

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