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With the advent of the big data era, the requirements for system performance and latency are getting higher and higher. Distributed caching technology and file system technology have gradually become the mainstream solutions to solve the problem. As an enterprise-level language, Java also has rich technical support in caching and file systems. This article will introduce distributed caching technology and file system technology commonly used in Java.
1. Distributed caching
Caching technology refers to caching frequently used data in memory for quick access. Distributed caching refers to distributing cache to multiple nodes to improve cache availability and performance. Commonly used distributed caching technologies in Java include Memcached and Redis.
Memcached is a high-performance distributed cache system that stores data in the form of key-value pairs and caches the data in memory. The principle of Memcached is relatively simple. It can perform distributed storage by setting up multiple nodes to form a cluster.
In Java, we can use Spymemcached and Xmemcached to operate Memcached. Spymemcached is a pure Java-implemented Memcached client that supports all commands of the Memcached protocol and provides both asynchronous and synchronous operation modes. Xmemcached is another Memcached client implemented in Java. Similar to Spymemcached, it also provides asynchronous and synchronous operation modes. The difference is that Xmemcached supports some advanced features that Spymemcached does not support, such as CAS operations and hit rate counters.
Redis is a high-performance key-value storage database that supports a variety of data structures, such as strings, hash tables, lists, sets, and ordered Collection etc. It not only supports distributed storage, but also supports advanced features such as data persistence, transactions, and Lua scripts.
In Java, we can use Jedis and Redisson to operate Redis. Jedis is one of the Java clients for Redis, which provides basic key-value operations and some advanced features, such as publish-subscribe functionality and connection pooling. Redisson is a more comprehensive Redis client. In addition to supporting all Redis native commands, it also provides advanced functions such as distributed locks, distributed collections, and distributed objects.
2. File system
File system technology refers to a system that stores file data on one or more disks and provides read and write operations. Distributed file system refers to distributing file system data on multiple nodes to improve the scalability and reliability of the file system. Commonly used distributed file system technologies in Java include Apache Hadoop and Ceph.
Apache Hadoop is an open source distributed file system and computing framework that divides file system data into multiple blocks and stores them in multiple on the node. Hadoop provides a large number of computing frameworks, such as MapReduce, Hive, and Pig, to process data in distributed file systems.
In Java, we can use Hadoop's Java API or Hadoop Streaming to operate the Hadoop file system. Hadoop's Java API provides a set of classes to operate the Hadoop file system, such as FileSystem, FSDataInputStream, FSDataOutputStream, etc. Hadoop Streaming is a tool that integrates MapReduce tasks with any programming language through standard input and output streams and shell scripts.
Ceph is an open source distributed file system and object storage system. It uses RADOS (scalable object storage) technology to divide data into multiple objects and stored on multiple nodes. Ceph provides a variety of access interfaces, such as RADOS Gateway and CephFS, to meet different needs.
In Java, we can use Rados Java SDK and CephFS Java SDK to operate Ceph. Rados Java SDK provides a set of classes to operate the RADOS system, such as Rados, RadosCluster, RadosPool, etc. The CephFS Java SDK provides a set of classes to operate the CephFS file system, such as CephFS, CephMount, and CephFilesystem.
3. Summary
Distributed caching and file system technologies are common solutions to solve problems in the big data era. Java, as an enterprise-level language, also has rich experience in caching and file systems. Technical Support. This article introduces commonly used distributed caching technology and file system technology in Java, which can help developers choose appropriate technical solutions to meet their needs.
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