spymemcached

问题 I use spymemcached 2.6rc1 in my Java project where I want to use the Long class as a storable object. Unfortunately, when I store e.g. new Long(0) object, the get(...) and incr(...) give the wholly different results - get gives Long object that contains 48 value and incr gives 1. Please note that 48 represents the ASCII "0" symbol. When I try to get the value for the same key directly from memcached (e.g. by using telnet) I get the correct result - 0. Strange, the Long is good serialized

问题 I would like to use caching in my web application which will be scalable and distributed as well. I have used EHCache and MemCache both in small-small web application separately. Have googled and got mixed review about both, hence would like to get some help and strong features of each, so i can decided which framework is suitable for my web application. Let me know if need further details. Thanks !! 回答1: EHCache is very easy to integrate with Hibernate applications (web apps that use

问题 So, I'm trying to implement a distributed lock using memcached and add()'s store only if does not exist contract (Java & spymemcached, but applicable in any language of course). Of course, if an instance goes away, then we lose the lock so the thought was add the lock 3 times (e.g. MyLock1, MyLock2, MyLock3) which will very likely hash out to 3 different instances. But, I've realized that if an instances goes down the hash then obviously changes (using spymemcached's Redistribute failure mode

问题 I want to manage mutiple DataSource using your Application Servers built-in features and access it using JNDI. I am using Spring boot with Spring JPA data. I am able to configure the application.properties for single datasource. But while trying to do the same for mutiple datasource, I am getting an exception while starting the application. Exception while starting the tomcat server:- Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner

问题 Thanks to the 'Getting started guide' in ‘simple-spring-memcached’ I manage to get memcached working in my project using ‘Spring 3.1’ example in in the guide , Im using ‘spymemcached’ as the provider . All working well when memcached server is up and running. However, when memcache server is not accessible (deliberately shut down for testing) underline code doesn’t work and application wont execute simply throwing runtime exception ,stating that unable to connect to memcache server and

问题 Thanks to the 'Getting started guide' in ‘simple-spring-memcached’ I manage to get memcached working in my project using ‘Spring 3.1’ example in in the guide , Im using ‘spymemcached’ as the provider . All working well when memcached server is up and running. However, when memcache server is not accessible (deliberately shut down for testing) underline code doesn’t work and application wont execute simply throwing runtime exception ,stating that unable to connect to memcache server and

问题 Does memcached entries with expiry time set to 0 not expire - as mentioned in the PHP Memcached docs, but not mentioned in the memcached protocol spec? I am using spymemcached client and the docs for spymemcached does not say anything about it either. 回答1: Setting expiration to 0 means the item has no expiration. Therefore it will never expire. 来源： https://stackoverflow.com/questions/22212647/memcached-entry-expiration-set-to-0

问题 I'm getting strange behavior in memcached, in particular, behavior that is strange in its consistency. Here is my test: @Test public void testMemc() { logger.info("Setting head."); memc.set(env.memcachedQueueKeys().head, 3600, 0); logger.info("Set head; incrementing."); memc.incr(env.memcachedQueueKeys().head, 1); logger.info("Incremented."); } And here is the output: 28 11:04:52.932 INFO; Setting head. 2014-01-28 11:04:52.933 WARN net.spy.memcached.MemcachedConnection: Could not redistribute

问题 Question:- Does java client need to worry about multiple servers ? Meaning:- I have given two servers in memcached client, but when i set or get a key from cache, do i need to provide any server related info to it or memcache itself takes care of it?? My knowledge:- Memcache itself takes care due to consistent hashing. but does spymemcached 2.8.0 provides consistent hashing??? 回答1: Memcached servers are pooling servers. Meaning that you define a pool (a list) of servers and when the Java

问题 i am using memcached server to store some object with different expire times, is there some way to add event listener on removal or expiration of that object? Currently i'm using spymemcached client. How can i achieve that i do some cleanup just before my object is deleted/expires. Thanks 回答1: There is no way to register an event listener on memcached server. Also, expired objects are lazily removed from memcached. This means that an expired item will only be removed if you try to get an item