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2021SC@SDUSC bolt source code analysis (III) 2021SC@SDUSC This article mainly introduces the bolt interface Bolt interfaces defined in Storm mainly include IBolt, IRichBolt, IBasicBolt and IBatchBolt The relationships are as follows: IBolt.java IBolt defines the function set of Bolt, and its code is as follows: public interface IBolt ex ...

Hadoop practice (2)Author WenasWeiprefaceIn the previous Hadoop practical chapter, I introduced the local mode and pseudo cluster mode installation of Hadoop offline batch processing technology. Next, I will continue to learn the Hadoop cluster mode installation; It will be introduced from the following points:Linux host deployment planningZook ...

catalogue 1. Two main features: 2D scatter diagram 1.1 two dimensional scatter diagram 1.2 two dimensional classified scatter diagram 1.3 bubble chart 2. Three main features: three-dimensional scatter diagram 2.1 three dimensional scatter diagram 2.2 three dimensional classified scatter diagram 3. Multi principal features: 2D scatter ma ...

1. Use background Recently, the group wants to build a set of real-time data warehouse in the existing environment. After comprehensive analysis, doris will be used as the database of real-time data warehouse. The data sources include message data and business database data. 2. Data source access It's easy to say the message data. Whether pu ...

The reason why Es is a member of the elastic stack family is that its search function is very powerful. In fact, it is a distributed search engine. install The installation of this article is based on Ubuntu 20.04 TLS virtual machine and adopts the mode of. tar.gz, < Click to download Linux x86_64 bit tar. GZ > After extracting the dow ...

Consumer client development         After understanding the concept of consumer and consumer group, we can start the development of consumer client. In the history of Kafka, the consumer client, like the producer client, has experienced two major versions: the first is a client written in scala at the beginning of Kafka's ...

1, Previously on The last article introduced the Api calling method of MapReduce and the configuration of eclipse. This time, we will use MapReduce to count words in English article files! Welcome to my previous article: MapReduce related eclipse configuration and Api call 2, Preconditions Installation requiredDownload methodIDEAO ...

JMX_Expotermonitor At present, CDH and HDP will merge closed source in the future. The company plans to spend time developing a similar platform. I have also made some efforts in cluster monitoring. monitor For a cluster management platform, the first thing to bear the brunt is how to realize the monitoring. After all, many times we open ...

10, ES 7. Advanced - aggregation Aggregation provides the ability to group and extract data from data. The simplest aggregation method is roughly equal to SQL Group by and SQL aggregation function (average, maximum and minimum) polymerization It is used to process the queried data # Including mil, average age GET bank/_search { "que ...

Author: duktig Blog: https://duktig.cn (first article) Excellent still work hard. May you enjoy what you give and enjoy what you get. See github knowledge base for more articles: https://github.com/duktig666/knowledge background After learning Hadoop, do you feel that writing a MapReduce program is very complex, and it requires a lot ...