memcached | 易学教程

Expiring memcache via regex

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问题 I'm using memcache in my rails app. I want to say expire all the entries with keys like 'foo-123-*' Where * is any string. Of course, no memcache distribution supports this directly (right?) because it's built to be simple and fast so it doesn't have indexes. There are a couple projects that sort of address this, by keeping a local list of keys: https://github.com/defconomicron/dalli-store-extensions https://github.com/jkassemi/memcache-store-extensions But in keeping the list in memory… that

Multiple Servers And Memcached

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问题 If Server 1 has both my database and Memcached as well as www.website1.co.uk - the site will work fine. But What if I have the following scenario: Server 1 - Database - Memcached - website1.co.uk Server 2 - website2.co.uk Server 3 - website3.co.uk How would I set this up so website2 and website3 can all connect, read and write to the memcached db on Server 1 (they can already connect to server 1 and read and write to the DB without memcache). Would I need to install Memcache on server 2 and

The proper way to scale python tornado application

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问题 I am searching for some way to scale one instance of tornado application to many. I have 5 servers and want to run at each 4 instances of application. The main issue I don't know how to resolve - is to make communication between instances in right way. I see next approaches to make it: Use memcached for sharing data. I don't think this approach is good, because much traffic would go to server with memcached. Therefore in the future there can be trafic-related issues. Open sockets between each

NullPointerException calling tearDown() on Google App Engine LocalSErviceTestHelper

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问题 I am writing tests (integration and unit) for a Google App Engine Java app that relies heavily on Google App Engine services such as Memcache and Datastore. In order to test my application locally using these services, I have this line in the parent class of all my test cases: private final LocalServiceTestHelper helper = new LocalServiceTestHelper(new LocalDatastoreServiceTestConfig(), new LocalMemcacheServiceTestConfig()); I begin every test with this function call (via TestNG's

Memcache::set() broken pipe

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问题 In general, Memcache is working... but my log has many occurrences of this: Memcache::set() [memcache.set]: send of 8192 bytes failed with errno=32 Broken pipe (the number of bytes changes) PHP5.3, Memcache class (v2.2.5 - the latest stable version) What is a broken pipe, why is it happening so much, and can it be improved? 回答1: I've been researching and reading on this for quite a bit and have been hearing a lot of confusion on this. There's very little documentation out there on Memcached

How are concurrent updates handled in Memcached?

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问题 My understanding is that Memcached is lockless (in its default configuration), such that no client can impede any other client's operation. If that is the case, then how does Memcached handle two or more clients attempting to update the same object at the same time? How does Memcached handle multiple versions of an object? Simply take the one whose update finished last and evict the other versions from the cache? Is the database actively invalidating objects cached on a Memcached server? 回答1:

Programmatically configure Azure cache client

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问题 I just updated via nuGet to the latest Azure dll's (Id: Microsoft.WindowsAzure.Caching version 2.0.0.0, runtime version v4). That allowed me to configure a shared cache for my roles. The problem is when I try to access to the AppFabric Memcache programmatically (another cache, not related to the session). var servers = new List<DataCacheServerEndpoint>(); servers.Add(new DataCacheServerEndpoint(_hostname, _cacheport)); var conf = new DataCacheFactoryConfiguration(); conf.SecurityProperties =

Fatal error: Class 'Memcache' not found (installed with pecl)

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问题 I installed memcache via ssh, with: $ pecl install memcache And this was the output: https://pastee.org/w63sy And added this line to etc/php.ini : extension=memcache.so And when trying to initialize: /* MEMCACHE */ $memcache = new Memcache(); $memcache->pconnect('localhost',11211); I get: Fatal error: Class 'Memcache' not found in /home/piscolab/public_html/website.com/includes/sql.php on line 25 What am I doing wrong? I found this question but the problem was about his shared server. I am

Has anyone got memcached to work on Laravel Homestead php7 box?

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问题 I loaded up Laravel/Lumen on the new Homestead php7 box and encountered this error: FatalThrowableError in MemcachedConnector.php line 51: Fatal error: Class 'Memcached' not found Doing a phpinfo(); shows there is no memcached extension, but sudo service memcached status says memcached is running. It seems there is a php7 branch for memcached here: https://github.com/php-memcached-dev/php-memcached/tree/php7 Can anyone guide me on how to get it working in the new php7 Homestead VM? EDIT: I

Linux中安装使用memcached

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转至： http://www.czhphp.com/archives/252 如何将 memcached 融入到您的环境中？在开始安装和使用 using memcached 之前，我们需要了解如何将 memcached 融入到您的环境中。虽然在任何地方都可以使用 memcached，但我发现需要在数据库层中执行几个经常性查询时，memcached 往往能发挥最大的效用。我经常会在数据库和应用服务器之间设置一系列 memcached 实例，并采用一种简单的模式来读取和写入这些服务器。图 1 可以帮助您了解如何设置应用程序体系结构：图 1. 使用 memcached 的示例应用程序体系结构体系结构相当容易理解。我建立了一个 Web 层，其中包括一些 Apache 实例。下一层是应用程序本身。这一层通常运行于 Apache Tomcat 或其他开源应用服务器之上。再下面一层是配置 memcached 实例的地方 — 即应用服务器与数据库服务器之间。在使用这种配置时，需要采用稍微不同的方式来执行数据库的读取和写入操作。读取我执行读取操作的顺序是从 Web 层获取请求（需要执行一次数据库查询）并检查之前在缓存中存储的查询结果。如果我找到所需的值，则返回它。如果未找到，则执行查询并将结果存储在缓存中，然后再将结果返回给 Web 层。写入将数据写入到数据库中时