Data is stored in the database. In order to speed up business access, we put some data in the database in the cache. Then the question is, how to ensure the consistency of the data in the db and th
Category: ZooKeeper
ZooKeeper is a distributed, open source distributed application coordination service, an open source implementation of Google’s Chubby, and an important component of Hadoop and Hbase. It is a software that provides consistent services for distributed applications. The functions provided include: configuration maintenance, domain name services, distributed synchronization, group services, etc.
[ZooKeeper] ZooKeeper data Synchronize to switch to the new cluster plan
One. Synchronization scenario
The old cluster is mixed with multiple services, and data needs to be synchronized to the new cluster, and some services are cut to the new cluster. At the same
The current epoch, 0, is older than the last zxid
2019-01-11 10:33:19,963 [myid:]-INFO [main:[email protected]]-Reading configuration from: /data/apps/zookeeper/bin/../conf/zoo .cfg 2019-01-11 10:33:19,975 [myid:]-INFO [main:[email protected]]-Res
Consistency
Distributed classic structure
As shown in the figure, when the front end receives the request, By calculating the hash value of the key, the hash value is modulo 3, and then distributed to di
ZooKeeper (3) – internal principles
1. Node type
two. Stat structure
1) czxid-the transaction zxid that created the node
Every time you modify the ZooKeeper status, you will receive a timestamp in the form of zxid,
ZooKeeper distributed topic and Dubbo micro-service entry video tutorial
Course catalog:
< span style="color:#ffa500">Chapter 1 Introduction to Distributed System Concept and ZooKeeper
Introduction to the distributed system and ZooKeeper, so that everyone has a general
ZooKeeper (2) – Installation and Configuration
1. Download
https://zookeeper.apache.org/
2. Local mode installation
1. Preparation before installation
(1) Install Jdk
(2) Copy Zookeeper installation package to Linu
Read the Topic metadata saved by ZooKeeper
Read topic metadata saved by zookeeper Table of Contents 1. There are the following problems 2. Solutions 3. Code 3.1. KafkaHelper class< /li> 3.2. The complete code of main.cc 1 There are
ZooKeeper Monitoring (Zabbix)
I have been monitoring, these middleware Zookeeper, Kafka…, usually only know a little bit of fur, they have been built and deployed, and have not been used. , Generally it is used by big data st
High concurrent cache consistency problem
When the data is read:
Check the cache first, and the cache can’t check the database, and then put the checked results in the cache. These are basically not controversial.
But when the