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- W204066530 abstract "As scaling out applications with multiple servers has become a popular industry practice, we investigate collaborating distributed Query Engines (QEs) to support graph-structured SQL dataflow processes. A SQL dataflow process consists of queries (optionally with UDFs) linked with relational dataflow. We focus on using Distributed Caching Platform (DCP) for inter-QEs data communication. While DCP has gained popularity lately, exchanging query results tuple-by-tuple through DCP is often inefficient due to the tiny granularity of cache access and the overhead of data conversion and interpretation. This has motivated us to explore a new and more efficient mechanism for inter-QEs communication, taking advantage of DCP’s binary protocol. We propose the page-flow approach characterized by extending and externalizing the database buffer pool to DCP to allow the producer QE to put query results as data pages (blocks) to the DCP to be retrieved by the consumer QE. In this way, the relational dataflow logically becomes binary page-flow; the tuples contained in the transferred pages are exactly in the format required by the relational operators thus can be feed in queries directly without any conversion. Further, using pages as mini-batches of tuples, enhances the latency of DCP access. We have implemented this mechanism on a cluster of PostgreSQL engines. Our experiments results demonstrate its value." @default.
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- W204066530 date "2013-01-01" @default.
- W204066530 modified "2023-10-18" @default.
- W204066530 title "Page-Flow in Query Engine Grid" @default.
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- W204066530 doi "https://doi.org/10.1007/978-3-642-32172-6_9" @default.
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