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Fault-tolerant, load-balancing queries in telegraph


Mehul A. Shah and Sirish Chandrasekaran

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Abstract

. For ex­ ample, inaccurate cost estimates may overload a node caus­ ing it to thrash. These imbalances are di#cult to anticipate and may reduce or even negate the benefits of parallelism. To address these issues, we built a parallel query processor in Telegraph that handles local failures and gracefully adapts to runtime perturbations in a cluster. In addition, it adapts to volatility from wide­area sources.


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