http reverse proxy

1. pound

https://help.ubuntu.com/community/Pound

/etc/pound/pound.cfg

 

2. squid

# /etc/squid/squid.conf

# same public IP for ceph.minggr.net, www.example.com, example.com

http_port 80 vhost

cache_peer 192.168.1.1 parent 80 0 no-query originserver name=server_1
acl sites_server_1 dstdomain ceph.minggr.net
cache_peer_access server_1 allow sites_server_1

cache_peer 192.168.1.2 parent 80 0 no-query originserver name=server_2
acl sites_server_2 dstdomain www.example.com example.com
cache_peer_access server_2 allow sites_server_2

ceph read call stacks

jewel-10.2.5

1. 第一步: messenger thread读取message,送入队列

2. 第二步, ”tp_osd_tp” thread取出消息,进行read

 

Big Data Engineer

Big Data Engineer

2016 salary range: $129,500 to $183,500

2017 salary range: $135,000 to $196,000

Projected salary growth: 5.8%

These pros design and implement solutions for big data challenges. They gather business objectives from users and data scientists, and then they translate those objectives into data-processing workflows. They should have a strong knowledge of statistics, programming experience in Python or Java, and the ability to design and implement big data solutions. Experience with NoSQL is preferred. They should also have experience with data mining, processing large amounts of raw data, and maintaining relational databases for storage and data acquisition. These pros typically hold a bachelor’s degree in a related field and have from four to six years of experience.