replication

Keep Solr slaves in sync

由 末鹿安然 提交于 2019-12-10 11:18:39
问题 We have a master-slave setup running Solr 6.5.0. There is a backend process running 24/7 which pushes its data towards the master server. No commit is done on master. The web frontend is accessing the slave. Replication poll interval is 1 hour. All is fine so far, but now as the traffic grows, the CPU load on slave is really high. I thought the best thing would be to add a second slave to the master and let the web servers connect via existing load balancers to the two Solr slave machines. I

Node js / MongoDB replica set array in javascript

由 倾然丶 夕夏残阳落幕 提交于 2019-12-10 10:17:51
问题 Warning: I'm a novice programmer (more of sysadmin). We were given an node js application that's using MongoDB. From what I can tell, the mongo.js file is using mongojs and monq java classes. It was setup with only one MongoDB and I'm trying to setup a new HA environment to use a replica set. Here is what they provided: var mongojs = require('mongojs'); var monq = require('monq'); var dbName = 'exampledb'; var db = mongojs(dbName, ['collections']); var client = monq('mongodb://127.0.0.1

How do you retrieve the replication factor info in Hdfs files?

由 我怕爱的太早我们不能终老 提交于 2019-12-10 03:34:33
问题 I have set the replication factor for my file as follows: hadoop fs -D dfs.replication=5 -copyFromLocal file.txt /user/xxxx When a NameNode restarts, it makes sure under-replicated blocks are replicated. Hence the replication info for the file is stored (possibly in nameNode ). How can I get that information? 回答1: Try to use command hadoop fs -stat %r /path/to/file , it should print the replication factor. 回答2: You can run following command to get replication factor, hadoop fs -ls /user/xxxx

replication between two tables with different names and which have different column names. Is it possible to create such replication

由 浪子不回头ぞ 提交于 2019-12-09 19:44:01
问题 I have a requirement where i have create replication between two tables with different names and which have different column names. Is it possible to create such replication. server A server B ---------- ---------- Table : Test Table : SUBS -------------- --------------- columns A,B,C Columns D,E,F,G,H I want to configure replication so that column A data is replicated to column D, column B data is replicated to column E, column C data is replicated to column F 回答1: Apparently, the answer is:

SQL Replication Setup - Almost There

由 核能气质少年 提交于 2019-12-09 18:40:37
问题 I'm trying to setup replication between two SQL Servers and I'm almost there but stuck on a permission error (it appears). The servers are connected via VPN. Publisher/Distributer = W2003 + SQL2005 (Domain Controller) Subscriber = W2008 + SQL2008 (Stand Along Server not on a domain) I have set it up to Pull rather than push only because that's the way I got past the logins issue. Current status is that both agents are running and the snapshot has completed but it doesn't start replicating.

Ehcache / Hibernate and RMI replication with large number of entities

由 故事扮演 提交于 2019-12-09 16:26:40
问题 I'm currently investigating how to use the RMI distribution option in ehcache. I've configured properly ehcache.xml and replication seems to work fine. However I've 2 questions: -> It seems ehcache/ hibernate creates 1 cache per Entity. This is fine, however when replication is in place it create 1 thread / cache to replicate. Is this the intended behavious ? As our domain is big, it creates about 300 threads, which seems to me really big -> Another nasty consequence is that the heartbeat

MySQL主从（Master-Slave）复制

由 心已入冬 提交于 2019-12-09 11:27:46
本文内容主要来源：官方文档中文版第6章“ MySQL中的复制 ”。本文只记录配置要点。 1. 主数据库配置（通常在 /etc/my.cnf ）： 在 [mysqld] 中加入以下几条配置： server-id=1（为任意值） log-bin=mysql-bin binlog_do_db=你要复制的数据库（实际上是要做 二进制日志 的数据库） binlog_ignore_db=mysql（要忽略的数据库） 重启MySQL服务器后进入client，创建数据库用户以便“从数据库”连接： GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%.mydomain.com' IDENTIFIED BY 'slavepass'; （用户名、密码以及从服务器主机地址可自定义） 然后刷新读写缓冲区并锁定表读写操作： FLUSH TABLES WITH READ LOCK; 这个时候再另外连接到主机shell（不要关闭当前MySQL连接，否则锁定会解除），开始复制数据库到从数据库（事先要创建同名数据库，也可以使用“ mysqladmin -h 从服务器地址 create 数据库名 ”进行创建）： mysqldump --opt 要复制的数据库 -p主数据库root密码 -R -B | mysql -h从服务器地址 要复制的数据库名 -p从数据库root密码 复制完后

Database Replication or Mirroring?

由 一曲冷凌霜 提交于 2019-12-09 05:42:04
问题 What is the difference between Replication and Mirroring in SQL server 2005? 回答1: In short, mirroring allows you to have a second server be a "hot" stand-by copy of the main server, ready to take over any moment the main server fails. So mirroring offers fail-over and reliability. Replication, on the other hand, allows two or more servers to stay "in sync" - that means the secondary servers can answer queries and (depending on setup) actually change data (it will be merged in the sync). You

pymongo MongoClient connect to ReplicaSet

由 …衆ロ難τιáo~ 提交于 2019-12-08 20:30:06
问题 I adopted pymongo's MongoClient class to do connect to a replicaset which has three node, 1 primary 2 secondary. The code snippet as following: c = MongoClient([secondary1_hostname, secondary2_hostname], replicaSet='rs0') When check the three mongod's log, I found there is always a connection created to the primary host, but other 2 secondary not received the connection request from client or got connection immediately disconnected. Seems the client first reached one secondary got the primary

How can I filter data during replication and give user only his own documents?

由 独自空忆成欢 提交于 2019-12-08 16:51:42
问题 I need to sync server data from CouchDB and PouchDB on client side. Every user has his own data. When he is online this data is being updated. How can I filter data during replication and give user only his own documents? This is security issue for me. 回答1: Currently the best practice for doing private user data in PouchDB/CouchDB is to give each user their own database on the server side. I have some instructions here for how to do this. 回答2: Having a separate DB for each user is fine until
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