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The consistent hashing algorithm was first published in 1997.Consistent hashing and random treesHas been proposed, and is widely used in the cache system;1. Basic scenarios For example, if you have n cache servers (hereinafter referred to as cache), how can you map an object to N caches, you are likely to use a method similar to the following to calculate the object's hash value, and then uniformly map it t

When the SQL statement executes, it produces a consistent read.What is logical reading? The CPU reading these blocks in memory is called a logical read (consistent get), and the IO generated during the reading process is the logical IO. During the logical reading process, the CPU resources are consumed very much. Therefore, the less logical reading of the SQL tuning, the better. You must adjust the buffer G

Article Home Directory Introduction to distributed consistent hash algorithm Distributed consistent hash algorithm using background Ring Hash Space Map key to ring hash space Mapping server nodes to hash space Mapping Key to server node Add server node Remove the server node Introduction of Virtual Nodes The problem of node change data shunt A comparison betw

Original: http://blog.codinglabs.org/articles/consistent-hashing.htmlThis paper will introduce the consistent hashing algorithm (consistent Hashing) and its application in distributed system from the practical application scenario. First of all, this article will describe a problem scenario that is often encountered in daily development, by introducing a

Consistent hashing algorithm, when I first heard the name, it felt particularly advanced. And it tends to be related to distributed systems, which, to be exact, are distributed caches.In Web services, caching is a thing between a database and a server-side program. In the site's business is not very large, generally do not need this thing, every time can be queried from the database to obtain data, but as the number of visits to the site, each request

In Oracle databases, consistent gets is useful for judging the performance of a section of SQL, and generally comparing the performance of two segments of SQL is not to see whose execution time is short, but to see whose consistent gets small. But this is not absolute, the following example is a counter example. One: Normally, data that is not in logical RAM buffer is read through physical reads, and physi

What is logical read? The process in which the cpu reads these blocks in the memory is called the logical read (consistentget). The IO generated during the reading process is the logical IO. What is logical read? The process in which the cpu reads these blocks in the memory is called the consistent get. The IO generated during the reading process is the logical IO. Consistent reads are generated when S

Until now, consistent hashing has not been clearly defined. Most documents still describe consistent Hashing Based on their application scenarios. "Hash" must have been understood by everyone. The question is "consistency "? Consistency Before discussing consistent hash, we should first understand the "non-consistent