Kafka Basic Use Method (Java)

Kafka Basic Use Method (Java). Procedure: Create topic $ cd/opt/cloudera/parcels/kafka-2.1.1-1.2.1.1.p0.18 $ bin/kafka-topics--create--zookeeper localhost : 2181--replication-factor 1--partitions 1--topic test Analysis:

memcahced Introduction

Memcahced introduced, Memcached is a set of High-performance memory object caching system for some high load Web sites, the main role is to cache database query results, reduce the number of database visits to improve the response speed of dynamic Web applications. Memcached is a typical C/s architecture, so it is necessary to install server-side (Memcached) and Client (memcache). Server side is written in C language, the client can be written in any language, such as PHP, Python, per ...

Thread Pooling Basics Sharing

The benefits of the thread pool: Reduce resource consumption: Avoid resource consumption for frequent creation and destruction of threads; increase the speed: when new tasks arrive, you do not have to create a new thread every time to execute it immediately; increase the manageability of threads: the thread pool distributes, tuned, and monitored threads uniformly.   Unrestricted creation of threads is not allowed. The realization principle of line Cheng code when the thread pool receives a new commit task, how the thread pool handles the new task, which mainly learns the thread pool's processing flow for the new task. The number of threads currently running is less than C ...

RABBIT-MQTT+PMQTT Protocol +paho Library (ubuntu16.04)

RABBIT-MQTT+PMQTT Protocol +paho Library (ubuntu16.04). Step 1 Download Install RABIIT-MQ mqtt-server on the Deb package another need sudo apt install erlang 2 boot sudo/etc/init.d/rabbitmq-server restart 3 mqtt-3.1 protocol support Rabbitmq-plugins Enable ...

Spark conversion (transform) and Action (action) list

Spark conversion (transform) and Action (action) list. The following func, most of the time, to make logic clearer, we recommend using anonymous functions! (lambda) "" "Ps:java and Python APIs are the same, names and parameters are unchanged." Transform meaning Map (func) Each INPUT element is exported after a Func function conversion and output an element filter (func) returns the value returned after the Func function evaluates to The input element of true is composed of ...

Docker version Jenkins Build

Docker version Jenkins built. 1. Download Docker Yum Install docker-y 1.1 configuration Docker boot from SYSTEMD systemctl enable Docker 1.2 start Docker Systemctl start Docker 2. Download Docker version Jenkins docker pull Jenkins 3. Rename Docker image, ...

Sparkha cluster configuration

Sparkha cluster configuration, spark cluster Hadoop configuration based on Hadoop HDFs. Su-rdato cd/u01 tar-zxvf spark-2.1.1-bin-hadoop2.7.tgz mv spark-2.1.1-bin-hadoop2.7 Spark #复制模版 cp/u01/spark/conf/ Spark-env.sh.template/u01/spa ...

Kubernetesscheduler Module Code Learning

Kubernetesscheduler Module Code learning, Scheduler module in the kubernetes is relatively easy to understand the module, but its work is more important, it is mainly responsible for those who have not found node to run the pod to select the most appropriate node. Its job is to find the right node for the pod and then submit it to apiserver Binder that the pod is already part of the node and that the Kubelet module is responsible for the subsequent work. Scheduler die ...

Hdfssink Configuration in Flume

Description of HDFs sink configuration parameters in flume. Official configuration URL: Http://flume.apache.org/FlumeUserGuide.html#hdfs-sink type:hdfs path:hdfs Path, need to include file system identification, such as: hdfs:// Namenode/flume/flumedata/fileprefix: Default value: Flumedata, write hdfs filename prefix file ...

Big data, the entry coincides with its time

Large data, the entry coincides with its time, in recent years, large data is not a fire, especially in 2017, the development of large data industry was written into the government's work report, large data began not only in the enterprise strategy, but also began to appear in the government's planning, can be said to be the darling of the 1, the importance of large data in recent years, with the development of science and technology, the rapid progress of computer technology, large data and intelligent operational dimension is becoming more and more important. On the big side, big data will play an important role in promoting China's economic transformation: first, through the analysis of large data can help solve China ...

memcached Installation and use

memcached installation and cluster deployment source pack: libevent-1.4.14b-stable.tar.gz memcached-1.4.29.tar.gz libevent Installation Memcached is dependent on the asynchronous time-time notification library so it is necessary to install libevent [root@bogon ~]# tar-xf/src/libevent-1.4.14b-stable.tar.gz-c/usr/src ...

Create a StatefulSet in K8s

StatefulSet problem created in K8s: Pod created using Deployment is stateless, when hanging in the Volume, if the Pod is hung, Replication Controller will run one to ensure availability, but because it is stateless, Pod Hanging up when the relationship with the previous Volume has been disconnected, the new Pod can not find the previous Pod. But for users, they are not aware of the underlying pods, but when the pods hang up ...

kubernetes learning record (7) - Elastic scaling and rolling upgrade

kubernetes learning record (7) - Elastic scaling and rolling upgrade. Elastic Scalability Elastic scaling refers to adapting to load variations and providing resources in a resilient, scalable way. Pod's flexible scaling is to modify the number of Replica Replicator Controller. Can be achieved through the Kubectl scale command. Create Replication Controller test-rc.yaml apiVersion: v1 kind: Replicatio ...

memcached high availability cluster theory and introduction

memcached high availability cluster theory and introduction. memcached In the realization of distributed cluster deployment, the memcached service is not between the communication, the distributed algorithm is through the client bar Data stored in different memcached, so when we finish the cluster client to write data inside, Will appear the following situation. After the client writes data to a memcached node, the other two nodes can not be queried. So how the outcome of this issue, is the next to be done. memcached ...

Domestic free virtualization OVM vs. OpenStack

Domestic free virtualization OVM Compared with OpenStack, OpenStack as a global open source software, its design was first positioned for large and medium-sized enterprises, because these enterprises can send a rich and powerful technical team for in-depth development and maintenance, and For lack of software development and operation and maintenance capabilities of traditional enterprises and SMEs, Yi Siwei OVM is 100% better choice. OVM is a one-stop solution out of the box OpenStack open source software installation and deployment for many operation and maintenance personnel are no stranger to, most enterprises only provide installation package ...

OpenCV Image Processing - Crop an image to a circle

1, Requirements In order to facilitate the display of user avatars on the front of the project, the avatar needs to be processed as a circle and the non-circular area as transparent. In fact, the front-end can be displayed at the time of processing, but the front-end with WebGL, temporarily uncertain, so the image from the back-end one-time processing. So, we try to use the Linux tool Convert to complete, however, there is no solution, the subsequent decision to use Python + OpenCV. 2, to achieve good code do not need to explain, look at the code directly, O (∩ _ ∩) O. #coding: utf8 impo ...

Giants struggle to support

Absrtact: With the concept of cloud storage increasingly clear, the market has become many practitioners of the land, and Baidu, Huawei, Tencent, 360 and other giants are flocking to join in this piece of blue sea, playing a burning money for channels of the enclosure game. The intervention of the Giants not only intensified the competition with the concept of cloud storage increasingly clear, the network market has become a lot of practitioners of the land, and Baidu, Huawei, Tencent, 360 and other giants are flocking to join in this piece of blue Sea, playing a channel of burning money to change the enclosure game. The intervention of the Giants not only intensified the competition, but also made some independent network disk into the loss of large number of users, business one ...

Inside and outside the slaughter cloud storage

Absrtact: I am the heavy user of Dropbox. In the United States, my family is the most exaggerated when a total of six computers in use, I often in order to find a file in the end of which computer and headache, Dropbox appear let me think it is exactly what I want "I am the dropbox of heavy users." In the United States, when my family is the most exaggerated when a total of six computers in use, I often in order to find a file in which computer in the end is a headache, Dropbox appearance let me think it is what I want. "Wanghuai a meal, then ...

Cloud storage Service Provider 115 network disk officially launched pass function

Absrtact: A few days ago, the domestic leading cloud storage service Provider 115 network Disk officially launched the PASS function. 115 Network disk users will be mobile phone number and 115 network Disk account binding, you can realize the use of mobile phone number to log on to 115 network disk and the use of mobile phone number to share file resources and other services. Recently, the domestic leading cloud storage service Provider 115 network Disk officially launched the PASS function.     115 Network disk users will be mobile phone number and 115 network Disk account binding, you can realize the use of mobile phone number to log on to 115 network disk and the use of mobile phone number to share file resources and other services. 1.

Giants scramble for cloud storage offering free banner

Absrtact: I am the heavy user of Dropbox. In the United States, my family is the most exaggerated when a total of six computers in use, I often in order to find a file in the end of which computer and headache, Dropbox appear let me think it is exactly what I want "I am the dropbox of heavy users." In the United States, when my family is the most exaggerated when a total of six computers in use, I often in order to find a file in which computer in the end is a headache, Dropbox appearance let me think it is what I want. "Wanghuai a meal, then ...

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