Instagram: http://instagram-engineering.tumblr.com/post/10853187575/sharding-ids-at-instagram Flickr: http://code.flickr.net/2010/02/08/ticket-servers-distributed-unique-primary-keys-on-the-cheap/ Ticket Server based on database (auto-increment in DB…

英文原文:http://instagram-engineering.tumblr.com/post/10853187575/sharding-ids-at-instagram 译文:http://www.cnblogs.com/xiekeli/archive/2012/07/10/2584255.html Instagram的存储量非常大,差不多每秒25-90张照片.为了保证我们的重要的数据能够合理的存储以便快速的提取应用,我们对数据进行了分片 -- 换句话说,将数据放到很多小的桶(bucket…

一.背景 今天部署项目到tomcat,执行./startup.sh命令之后,访问项目迟迟加载不出来,查看日志又没报错(其实是我粗心了,当时tomcat日志还没打印完),一开始怀疑是阿里云主机出现问题,访问ip:80发现nginx运行正常.在我百思不得其解时,项目访问正常了,查看启动日志,发现如下: 15-Mar-2018 16:41:02.302 WARNING [main] org.apache.catalina.util.SessionIdGeneratorBase.createSecure…

刚部署好程序,第一次登录时,加载非常得慢,查看log日志发现:Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [33,755] milliseconds. 说什么创建用于会话ID生成的SecureRandom实例花费了[33,755]毫秒. 解决办法:打开$JAVA_PATH/jre/lib/security/java.security这个文件,找到下面的内容: secureran…

编译安装tomcat-native和tomcat-deamon以后,发现toomcat启动很慢,好久才有响应.以下日志供参考: 11-Sep-2017 12:19:28.102 INFO [main] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/opt/apache-tomcat-9.0/webapps/ROOT]11-Sep-2017 12:19:28.…

一.背景 今天部署项目到tomcat,执行./startup.sh命令之后,访问项目迟迟加载不出来,查看日志又没报错(其实是我粗心了,当时tomcat日志还没打印完),一开始怀疑是阿里云主机出现问题,访问ip:80发现nginx运行正常.在我百思不得其解时,项目访问正常了,查看启动日志,发现如下: 15-Mar-2018 16:41:02.302 WARNING [main] org.apache.catalina.util.SessionIdGeneratorBase.createSecure…

Snapshot: When using the 'Flat File Source' and 'OLE DB Destination' or something else components to load some data through the components. Maybe we will have the error like that. Mismatched locale IDs. The component locale ID () does not match the c…

org.apache.catalina.util.SessionIdGeneratorBase.createSecureRandom Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [342,445] milliseconds. tomcat启动时间5分钟左右 打开  /java/jdk/jre/lib/security/java.security文件 securerandom.s…

#coding=utf-8 import flickrapi import requests import os n=1 flickr=flickrapi.FlickrAPI('****************','*************',cache=True) try: photos=flickr.walk(user_id='11613546@N03',extras='url_z') except Exception as e: print('Error') for photo in p…

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