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Maurice Chen
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配置说明 一、JVM 配置: Jdk1.8 ( es 要求最低 jdk1.7 ) 最大堆最小堆均为 32G GC 类型: -XX:+UseG1Gc -XX:MaxGCPauseMillis=200  。 其他默认。 二、Es 集群配置: es-test "test-169-71" node.master: false true niofs                                 ...

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20 Netstat Commands for Linux Network Management
netstat  ( network statistics ) is a command line tool for monitoring network connections both incoming and outgoing as well as viewing routing tables, interface statistics etc.  netstat  is available on all Unix-like Operating Systems and also available on...

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10 lsof Command Examples in Linux
This is our on-going series of Linux commands and in this article we are going to review  lsof  command with practical examples.  lsof  meaning  ‘LiSt Open Files’  is used to find out which files are open by which process. As we all know  Linux/Unix  consid...

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一些分散式系統通過複製資料來提高系統的可靠性和容錯性,並且將資料的不同的副本存放在不同的機器上,由於維護資料副本的一致性代價很高,因此許多系統採用弱一致性來提高性能,一些不同的一致性模也相繼被提出,主要有以下幾種: 強一致性:要求無論更新操作是在哪個資料副本上執行,之後所有的讀操作都要能獲得最新的資料。對於單副本資料來說,讀寫操作是在同一資料上執行的,容易保證強一致性。對多副本資料來說,則需要使用分散式事務協定(如兩階段提交或Paxos)。 弱一致性:在這種一致性下,用戶讀到某一操作對系統特定資料的更新需要一...
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