Aleksey Charapko

Playing Around

  • Monitoring with Retroscope: Detecting Invariant Violations

    Aleksey Charapko

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    Earlier I briefly mentioned Retroscope, our distributed snapshot library that makes taking non-blocking, unplanned consistent global distributed snapshots possible. However, these snapshots are only good if we know how to use them well. Of course the most obvious use case is just a data backup, and despite it being an important application for snapshots, I…

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  • Globally Consistent Distributed Snapshots with Retroscope

    Aleksey Charapko

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    Taking a consistent snapshot of a distributed system is no trivial task for the reasons of asynchrony between the nodes in the system. As the state of each machine changes in response to incoming external messages or internal events, each node may produce a log of such state changes. With the log abstraction, the problem…

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  • The Light of Voldemort

    Aleksey Charapko

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    Few month ago I showcased how a single server of Voldemort key-value store sounds.  Sonification is a valid way to monitor systems, and has been used a lot in real applications. Geiger counter would be one of the most well-known examples of a sonified application. In some cases sonification may be the preferred form of…

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  • The Sound of Voldemort

    Aleksey Charapko

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    Recently at our lab we discussed a fun little project of making distributed systems “play” music. The idea of sonifying a distributed application can be of some benefit for debugging and maintenance, since people have natural ability in recognizing patterns. Of course developer or systems administrators can analyze the logs of their systems and study the…

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