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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...，加入更多的机器来分担性能上的问题，以及来解决单点故障问题。 通常，我们会通过两种手段来扩展我们的数据服务：
1）数据分区：就是把数据分块放在不同的服务器上（如：uid % 16，一致性哈希等）。
2）数据镜像：让所...
How to reload a clojure file in REPL
...ace.repl. Subsequent calls to (refresh) will give you a RuntimeException, "Unable to resolve symbol: refresh in this context." Probably the best thing to do is to either (require 'your.namespace :reload-all), or, if you know you're going to want to refresh your REPL a lot for a given project, make a...
What's an appropriate HTTP status code to return by a REST API service for a validation failure?
...orrect (thus a 400 (Bad Request)
status code is inappropriate) but was unable to process the contained
instructions. For example, this error condition may occur if an XML
request body contains well-formed (i.e., syntactically correct), but
semantically erroneous, XML instructions.
...
What's the right way to decode a string that has special HTML entities in it? [duplicate]
...emo is available.
Here’s how you’d use it:
he.decode("We're unable to complete your request at this time.");
→ "We're unable to complete your request at this time."
Disclaimer: I'm the author of the he library.
See this Stack Overflow answer for some more info.
...
A complete solution to LOCALLY validate an in-app receipts and bundle receipts on iOS 7
...e the function that validates the receipt, it will throws an error if it's unable to validate it.
func validateReceipt() throws {
guard let appStoreReceiptURL = Bundle.main.appStoreReceiptURL, FileManager.default.fileExists(atPath: appStoreReceiptURL.path) else {
throw ReceiptValidatio...
How do you run a crontab in Cygwin on Windows?
...~/lunch_message_to_mates.sh
Domain users: it does not work. Poor cron is unable to run scheduled tasks on behalf of domain users on the machine. But there is another way: cron also runs stuff found in the system level cron table in “/etc/crontab”. So insert your suff there, so that SYSTEM does...
C++中智能指针的设计和使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...，use做自减1；
此时，条件成立。因为u2的use为1。那么，运行U_Ptr的析构函数，而在U_Ptr的析构函数中，做了delete ip操作，所以释放了内存，不会有内存泄露的问题。
接下来的操作很自然，无需多言：
ptr = rhs.ptr; // 复制U_Ptr...
PHP function to generate v4 UUID
...nerate cryptographically secure random bytes or throw an exception if it's unable to. This is better than even openssl_random_psuedo_bytes() whose output is sometimes not cryptographically secure under some circumstances.
– thomasrutter
Jul 12 '19 at 1:51
...
C dynamically growing array
...quickly grow if its size is irrelevant. In specialist uses this should be tunable.
– Dan Sheppard
Jul 19 '16 at 20:49
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CentOS+Nginx+PHP+MySQL详细配置(图解) - 更多技术 - 清泛网 - 专注C/C++及内核技术
...上面这个错误，原因是PHP-FPM自己不知道以那个用户和组运行PHP，所以我们要修改一个文件，把文件中的注释去掉即可（打开文件把红色部分删除），然后PHP-FPM会以nobody用户和组去运行PHP。
#vi /usr/local/php/etc/php-fpm.conf
#/usr/l...