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State-based CRDTs (also called convergent replicated data types, or CvRDTs) are defined by two types, a type for local states and a type for actions on the state, together with three functions: A function to produce an initial state, a merge function of states, and a function to apply an action to update a state.
Controlled replication under scalable hashing or CRUSH [28] is an extension to RUSH [29] that improves upon rendezvous hashing by constructing a tree where a pseudo-random function (hash) is used to navigate down the tree to find which node is ultimately responsible for a given key. It permits perfect stability for adding nodes; however, it is ...
[2] [3] [5] An assumption about the outcome of transactions, either commit, or abort, can save both messages and logging operations by the participants during the 2PC protocol's execution. For example, when presumed abort, if during system recovery from failure no logged evidence for commit of some transaction is found by the recovery procedure ...
Apache Kafka is a distributed event store and stream-processing platform. It is an open-source system developed by the Apache Software Foundation written in Java and Scala . The project aims to provide a unified, high-throughput, low-latency platform for handling real-time data feeds.
The quorum-based voting for replica control is due to [Gifford, 1979]. [3] Each copy of a replicated data item is assigned a vote. Each operation then has to obtain a read quorum (V r) or a write quorum (V w) to read or write a data item, respectively. If a given data item has a total of V votes, the quorums have to obey the following rules: V ...
Optimistic concurrency control (OCC), also known as optimistic locking, is a non-locking concurrency control method applied to transactional systems such as relational database management systems and software transactional memory.
The war has left large parts of several cities in ruins and displaced around 90% of Gaza’s population of 2.3 million people. Under the first phase of the ceasefire agreement, Hamas is to release ...
Redis supports master–replica replication. Data from any Redis server can replicate to any number of replicas. A replica may be a master to another replica. This allows Redis to implement a single-rooted replication tree. Redis replicas can be configured to accept writes, permitting intentional and unintentional inconsistency between instances.