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Distributed Stream Processing (DSP) engines analyze continuous data via queries expressed as a graph of operators. Auto-scalers adjust the number of parallel instances of these operators to support a target rate. Current auto-scalers couple CPU and memory scaling, allocating resources as one-size-fits-all packages. This contrasts with operators’ high diversity of requirements. We present Justin, an auto-scaler that enables hybrid CPU and memory scaling of DSP operators. Justin monitors both CPU usage and the performance of operators’ storage operations. Its mechanisms enable fine-grain memory allocation for tasks upon a query reconfiguration. The Justin policy identifies individual operators’ memory pressure and decides between adjusting parallelism and/or memory assignment. We implement Justin in Apache Flink, extending the Flink Kubernetes Operator and the DS2 CPU-only auto-scaler. Using the Nexmark benchmark, our evaluation shows that Justin identifies suitable resource allocation in as many or fewer reconfiguration steps as DS2 and supports a target rate with significantly fewer CPU and memory resources.

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Justin: Hybrid CPU/Memory Elastic Scaling for Distributed Stream Processing

  • 会议论文

  • 发表日期：

    2025年

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  • Donatien Schmitz,
  • Guillaume Rosinosky,
  • Etienne Rivière

摘要

Distributed Stream Processing (DSP) engines analyze continuous data via queries expressed as a graph of operators. Auto-scalers adjust the number of parallel instances of these operators to support a target rate. Current auto-scalers couple CPU and memory scaling, allocating resources as one-size-fits-all packages. This contrasts with operators’ high diversity of requirements. We present Justin, an auto-scaler that enables hybrid CPU and memory scaling of DSP operators. Justin monitors both CPU usage and the performance of operators’ storage operations. Its mechanisms enable fine-grain memory allocation for tasks upon a query reconfiguration. The Justin policy identifies individual operators’ memory pressure and decides between adjusting parallelism and/or memory assignment. We implement Justin in Apache Flink, extending the Flink Kubernetes Operator and the DS2 CPU-only auto-scaler. Using the Nexmark benchmark, our evaluation shows that Justin identifies suitable resource allocation in as many or fewer reconfiguration steps as DS2 and supports a target rate with significantly fewer CPU and memory resources.