scalability

问题 I have a very large matrix I'm trying to run through glmnet on a server with plenty of memory. It works fine even on very large data sets up to a certain point, after which I get the following error: Error in elnet(x, ...) : long vectors (argument 5) are not supported in .C If I understand correctly this is caused by a limitation in R which cannot have any vector with length longer than INT_MAX. Is that correct? Are there any available solutions to this that don't require a complete rewrite

问题 Here is the only way I know to ask it at the moment. As Understand it Scala uses the Java Virtual Machine. I thought Jruby did also. Twitter switched its middleware to Scala. Could they have done the same thing and used Jruby? Could they have started with Jruby to start with and not had their scaling problems that caused them to move from Ruby to Scala in the first place? Do I not understand what Jruby is? I'm assuming that because Jruby can use Java it would have scaled where Ruby would not.

问题 Storing sessions in disk very slow and painful for me. I'm having very high traffic. I want to store session in Advanced PHP Cache, how can I do this? 回答1: I tried to lure better answers by offering 100 points as a bounty, but none of the answers were really satisfying. I would aggregate the recommended solutions like this: Using APC as a session storage APC cannot really be used as a session store, because there is no mechanism available to APC that allows proper locking, But this locking is

问题 My team and I are in the middle of developing an application which needs to be able to handle pretty heavy traffic. Not facebook level but in the future I would like to be able to scale to that without massive code re-writes. My thought was to modularise out everything into seperate services with their own interfaces. So for example messaging would have a messaging interface that might have send and getMessages() as methods and then the PHP web app would simply query this interface through

问题 I have a project where I will develop an android application and a website. They both should share the same database. I am trying to explore all the options and I am really confused. Here are my requirements: 1- I need an extremely simple and EASY way. I am not trying to learn; I am just trying to get things done. 2- The database design includes relationships and foreign keys. Therefore, I need a relational database. 3- The users of the android app are limited ; as it is not an app that will

问题 I plan to use the Quartz scheduler as I read many good opinions about it. My problem is as follows: I will have thousands of triggers living in the system at any given time. Most of the triggers will fire just one event and die. In addition, it is very likely I will have to cancel many jobs after their allocation (based on new input). Can Quartz scale to this? Which JobStore is recommended? I planned to use the JDBC one over mysql. Added Information : My jobs will either send an e-mail or

问题 I have assumed that if instance variables are managed by spring IOC, and are singletons that the desgin can be called stateless and threadsafe.This type of desgin could consequently be scaled to clustered servers. Am I correct in my assumptions,outlined below ? @Repository("myDao") public class MyDao implements Dao { @Autowired private JdbcTemplate jdbcTemplate; @Value("${sqlFoo}") private String foo; @Override public Integer getMyInt(String str) { return jdbcTemplate.queryForInt(foo, str); }

问题 I'm working with a database schema that is running into scalability issues. One of the tables in the schema has grown to around 10 million rows, and I am exploring sharding and partitioning options to allow this schema to scale to much larger datasets (say, 1 billion to 100 billion rows). Our application must also be deployable onto several database products, including but not limited to Oracle, MS SQL Server, and MySQL. This is a large problem in general, and I'd like to read up on what

问题 I'm writing a chat server for Acani, and I have some questions about Scaling node.js and websockets with load balancer scalability. What exactly does it mean to load balance Node.js? Does that mean there will be n independent versions of my server application running, each on a separate server? To allow one client to broadcast a message to all the others, I store a set of all the webSocketConnections opened on the server. But, if I have n independent versions of my server application running,

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 3 years ago . Target application is a medium-sized website built to support several hundred to several thousand users an hour, with an option to scale above that. Data model is rather simple, and caching potential is pretty high (~10:1 ratio of read to edit actions). What should be the