Http://www.aliyun.com/zixun/aggregation/14417.html ">apache Hadoop is a widely used data analysis platform that is reliable, efficient and scalable. Percona Company's Alexander Rubin recently published a blog post describing how he exported a table from MySQL to Hadoop and then loaded the data into Cloudera Impala and ran it ...
Beginners Run MapReduce homework, often encounter a variety of errors, because of the lack of experience, often unintelligible, the general directly to the terminal printing errors to search engines, to learn from the experience of predecessors. However, for Hadoop, when an error is encountered, http://www.aliyun.com/zixun/aggregation/21263.html "> The first time should be to view the log, the log will have detailed error reason for the production, This article will summarize Hadoop ...
"The Internet World" is a series of questions that have come up since Intel announced in March this year that it was buying $740 million for big data [note] software solution provider Cloudera's 18% stake: for example, two companies have their own Apache Hadoop distributions, How are the two products and services integrated? is the Legacy Apache Hadoop Intel distribution user's follow-up service guaranteed? How has Intel changed its strategy on big data? And so on. May 8, Intel and Cloudera in ...
Cluster installation configuration Hadoop cluster nodes: Node4, Node5, Node6, Node7, Node8. Specific schema: The operating system is: CentOS release 5.5 (Final) installation Step one, create the Hadoop user group. Second, the installation of JDK. Download the installation JDK. The installation directory is as follows: Third, modify the machine name, modify the file hosts. As follows: Four, installs the SSH service. ...
Difio is a Django based application that tracks your package and notifies you when it changes. It provides a variety of variations, so you can determine when and how you want to upgrade in time. Previously, Difio was a closed source project, but the authors decided to open it up to be able to deploy internally and attract more community developers. The following is the author Alexander Todorov wrote the Difio open source process experienced 10 steps, compiling the main contents as follows, for your reference. 1. Delete ...
Fred Wilson, a senior venture capital expert, believes Apple will lose its position in top-3 technology in 10 years because it focuses on hardware development and its weaknesses in cloud technology. But actually the connection between Apple and the developer could be a bigger problem. It's not hard to see why Apple boasts that 6 million of developers last year were developing the iOS ecosystem, spending up to 10 billion dollars so far, 3 times times the sum paid to other platforms. So big ...
Cluster is a hot topic, in the enterprise more and more application of Linux operating system to provide mail, Web, file storage, database and other services, with the growing application of Linux, high availability and http://www.aliyun.com/zixun/aggregation/ 13996.html "> Load balanced Linux cluster is also developing gradually in the enterprise. The low cost, high performance and high scalability of the Linux platform enable the Linux cluster to meet at a low price ...
(1) The Apache Hadoop version introduces Apache's Open source project development process:--Trunk Branch: New features are developed on the backbone branch (trunk); -Unique branch of feature: Many new features are poorly stabilized or imperfect, and the branch is merged into the backbone branch after the unique specificity of these branches is perfect; --candidate Branch: Split regularly from the backbone branch, General candidate Branch release, the branch will stop updating new features, if the candidate branch has b ...
The Xcode IDE has many very tall tools, such as navigation, refactoring, calibration and so on, and the plug-ins that are assisted are improved and extended on the basis of Xcode. In the application development process, through the open source Package Manager Alcatraz to the plug-in installation management, to create the most powerful development environment, has long been a developer of the necessary lessons. This article summarizes the developer's favorite 10 open source Xcode plug-ins, involving code editing, annotation, management and other aspects. 1. Code Pilot said ...
Author: Chszs, reprint should be indicated. Blog homepage: Http://blog.csdn.net/chszs Someone asked me, "How much experience do you have in big data and Hadoop?" I told them I've been using Hadoop, but I'm dealing with a dataset that's rarely larger than a few terabytes. They asked me, "Can you use Hadoop to do simple grouping and statistics?" I said yes, I just told them I need to see some examples of file formats. They handed me a 600MB data ...
1, the Map-reduce logic process assumes that we need to deal with a batch of weather data, the format is as follows: According to the ASCII storage, each line of a record each line of characters from 0 start count, 15th to 18th word Fu Weihan 25th to 29th characters for the temperature, where 25th bit is a symbol + + 0067011990999991950051507+0000+ 0043011990999991950051512+0022+ 00 ...
Many documents describe the number of mapper that cannot be directly controlled by default because the number of mapper is determined by the size and number of inputs. By default, how many mapper should the final input occupy? If you enter a large number of files, but the size of each file is less than HDFs blocksize, then the startup mapper equals the number of files (that is, each file occupies a block), it is likely to cause the number of boot mapper ...
There is no road in the world, and the people who walk more and more become the way. Why not build a mongodb on http://www.aliyun.com/zixun/aggregation/14171.html ">postgres"? The Postgres community did not sit on the NoSQL after taking a series of actions. Postgres has been progressing: integrating JSON and PLV8. PLV8 introduce ...
51 ago, a DBA colleague feedback, in the day-to-day environment to delete a large slow log file (assuming the file size above 10G), and then execute flush slow logs in MySQL, will find mysqld live. Trying to reproduce the problem today, here's a brief analysis of why. Recurrence Step: 1. Constructs slow log (sets the Long_query_time to 0), 2. Observe delete rm Slow log moment, tps/q ...
After I built the Hadoop computing platform. (I 211.html "> think should be set up, JPS command to show the process is also the correct) on Master jps:slave2 on Jps:slave1 JPS: But after I run the WordCount always reported the following error: Although this is my error when running the Hadoop fl-ls. But when I run wordcount, I always report this mistake. Please have a look. ...
Oozie is the open source scheduling tool on the Hadoop platform, which has been used Oozie for nearly a year in the project, and the Oozie installation configuration is quite complex. In order to use it conveniently, a lot of configuration needs to be done. The following is a set of steps for Oozie installation configuration, for the use of Hadoop and Oozie children's shoes for reference, but also easy to see their own. 1 Decompression installation package TAR-XZF oozie-3.3.2-distro.tar.gz 2 modified addtowar.sh foot ...
With the proliferation of data volume, Mysql+memcache has not met the needs of large-scale Internet applications, many organizations have chosen Redis as its architectural complement, however, redis the use of the threshold is not low, such as not supporting SQL, here for everyone to share the Redis use of the full raiders. Redis, one of the most closely watched NoSQL databases, has been used by many well-known internet companies, such as Sina Weibo, Pinterest and Viacom. However, being born with no support for SQL makes him look difficult ...
HBase as a subproject under Hadoop, the current development is more powerful, and traditional relational database Oracle to compare, both have advantages and disadvantages, we first look at a simple table. Data maintenance: For example, UPDATE, just insert a new record according to key value, the old version is still in, will be in the process of storefile merge delete data maintenance: Add and remove change is very convenient, directly modify the above simple list of hbase and Oracle the difference between the two, There are other details where there is no description, can be from above the right ...
Hadoop has been widely used in information technology giants such as Taobao, Baidu, FaceBook and Yahoo, and many commercial release packages have emerged as the most mature platform in large data-solution areas. The Yong Maoyuan will share some hbase related technical content. Here is the original interview:-What is it that attracts you to delve into Hadoop technology? From a technical point of view, Hadoop is a popular distributed storage and computing framework. To meet the company's evolving large data computer storage needs. Good ...
Over the past two years, the Hadoop community has made a lot of improvements to mapreduce, but the key improvements have been in the code layer, http://www.aliyun.com/zixun/aggregation/13383.html "> Spark, as a substitute for MapReduce, has developed very quickly, with more than 100 contributors from 25 countries, and the community is very active and may replace MapReduce in the future. The high latency of mapreduce has become ha ...
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