Aleksey Charapko

HLC

  • Reading Group. Unifying Timestamp with Transaction Ordering for MVCC with Decentralized Scalar Timestamp

    Aleksey Charapko

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    Unlike many of my recent summarier, I will mskr this one short, I promise. “Unifying Timestamp with Transaction Ordering for MVCC with Decentralized Scalar Timestamp” NSDI’21 paper proposes a mechanism to order transactions in multi-version distributed data-stores. One of the problems with distributed transactions is the ordering required to achieve consistency. In particular, we often…

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  • Trace Synchronization with HLC

    Aleksey Charapko

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    Event logging or tracing is one of the most common techniques for collecting data about the software execution. For simple application running on the same machine, a trace of events timestamped with the machine’s hardware clock is typically sufficient. When the system grows and becomes distributed over multiple nodes, each node is going to produce…

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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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