1. Introduction BlockCache is an important feature in HBase. Compared with Memstore when writing data, the cache when reading data is BlockCache. LruBlockCache is the default implementation of BlockCache in HBase, which uses a strict LRU algorithm to eliminate blocks. 2. Cache level There are currently three cache levels, defined in BlockPriority, as follows: [java] […]
Tag: lru
Mybatis SqlRunner execution process
Mybatis’ SqlRunner execution process SqlRunner exec = new SqlRunner(connection); Map<String, Object> row = exec.selectOne(“SELECT * FROM PRODUCT WHERE PRODUCTID = ?”, “FI-SW-01”); connection.close(); assertEquals(“FI-SW-01”, row.get(“PRODUCTID”)); Initialization process of TYPE_HANDLER_MAP in TypeHandlerRegistry class public TypeHandlerRegistry() { //Register the system’s built-in type processor in the constructor //The following is registered to the same handler for multiple types […]
A Deep Dive into LRU: From Principles to Engineering Practice
1. LRU 1.1. What is LRU? The LRU (Least Recently Used) algorithm is an algorithm commonly used in cache elimination strategies. The basic idea is that based on the access history of the data, when the cache space reaches the upper limit, the least recently used data will be eliminated to free up space to […]
Caching strategies in Android: LruCache and DiskLruCache
Caching strategies in Android: LruCache and DiskLruCache Introduction This article mainly introduces the principles of the two cache classes built into Android. The so-called cache is to save the obtained data for continued use next time. This technology is especially useful in network requests and image loading, and can significantly improve the performance of the […]
Experiment 2 Use LRU method to update Cache
1. Experimental Purpose Understand and master the related technologies of register allocation and memory allocation. 2. Experimental Content Combined with the relevant knowledge of data structure, use the LRU strategy to perform internal Cache updates for a set of access sequences. The LRU replacement algorithm selects the most recently unused page for replacement. This algorithm […]
Implementation of OPT, FIFO, and LRU algorithms
1. Experimental Purpose Understand the characteristics of virtual storage technology, master the basic ideas and implementation processes of several basic page replacement algorithms in virtual storage request page storage management, and compare their efficiencies. Understand programming techniques and the causes of memory leaks Second, Experimental Content Simulate several basic page replacement algorithms for request page […]
Algorithm-Simulating LRU cache mechanism
Article directory Question meaning answer total code Question meaning Please design and implement a data structure that satisfies LRU (least recently used) cache constraints. Implement the LRUCache class LRUCache(int capacity) uses a positive integer as the capacity capacity to initialize the LRU cache int get(int key) If the key key exists in the cache, returns […]
Python3.8: Walrus Operator (:=)
Python3.8: Walrus Operator (:=) 1. Write in front Each new version of Python adds new features to the language. For Python 3.8, the biggest change is that it provides a new syntax for assigning variables in the middle of expressions through the := operator. This operator is commonly known as the walrus operator. This article […]
From LinkedHashMap source code to hand-shredded LRU cache
Hello everyone, my name is Fangyuan. Recently, I was brushing up on the LRU cache question on LeetCode, and found that the answer included two solutions: LinkedHashMap and defining a doubly linked list by yourself. However, I was not clear about the source code related to LinkedHashMap, so I was ready to learn and record […]
Basic usage and principle analysis of LruCache
Recently, when I was studying time zone issues, the underlying implementation of time zones involved the use of the BasicLruCache collection, so I partially understood LruCache. BasicLruCache is a simple LRU cache implementation provided by Android, but it does not exist in the standard Java class library. . Directory LruCache basic principles Basic use of […]