hive performance tuning

Hive General learners and trainers in the performance optimization of the general will be from the syntax and parameters of these tricks point of view, but not revolutionary optimization of hive performance, the reasons for this phenomenon are: 1, historical reasons and stereotypes: When you learn SQL is generally a st

. Script. Trust=falsehive. exec. Show. Job. Failure. Debug. Info=true ...These parameters are configured in $hive_home/conf/hive-site.xml and are now included in this configuration file:property > name>Hive.exec.parallelname> value>Truevalue>Property >property > name>Hive.exec.parallel.thread.numbername> value>16value>Property >Restart Hive and see that the parameters you have just configured ar

Explain:1, JVM reuse is the content of the Hadoop tuning parameters, the performance of the hive has a very large impact, especially for the difficult to avoid small file scenes or more task scenes, such scenes most of the execution time is very short. The Hadoop default configuration is to use a derived JVM to perform the map and reduce tasks, which can cause co

In-depth Java Program Performance tuning (Amdahl law, cache component, parallel development, thread pool, JVM tuning)Course Lecturer: SpecialCourse Category: Java coreSuitable for people: BeginnerNumber of lessons: 33 hoursUpdate level: CompleteUsing technology: Amdahl Law, caching components, parallel development, thread pooling, JVM tuningProjects involved: the

, the GROUP by in the subquery looks superfluous (functionally superfluous, unless there is COUNT (DISTINCT)), if it is not due to Hive bugs or performance considerations (if the data does not get the correct result if the subquery GROUP by is not executed) Hive bugs). So this Hive is converted by experience as follows

Tags: implementation mechanism originally page organizes tables based on free article content index ClustFollowing the book on SQL tuning (SQL tuning or SQL optimization) in the essentials of high-performance SQL tuning and case resolution, we talk today about one of the most important core mechanisms of SQL

Tags: and fast speaking tuning market buffer way a completely"High-performance SQL Tuning essentials and Case Resolution" a book has been launched, many enthusiastic readers on the contents of the book and some of the specific questions raised questions, because of the numerous readers plus my daily work busy, here on the SQL

timeout; b read timeout; c write timeout);2.2. Parallelization of the serial request;A) use of curl_multi_* ();b) Use the swoole extension. 3. compress the PHP interface output:Using gzip compressionBenefits: Facilitates faster reception of data by client side;Cons: Extra CPU overhead 4. Cache Duplicate content: multiple requests, the content is not changed under the circumstances; 5.smarty Tuning and time window overlap ideas (which can be used in c

Performance Tuning: IO consumption analysis, performance tuning io consumption Performance Tuning-> how to analyze io consumption Reprinted please indicate the source: http://blog.csdn.net/supera_li/article/details/45225077For mo

few duplicate association keys in front of a join can improve the efficiency of the join." " The final conclusion is: The table written on the left side of the association with each of the 1 Duplicate association keys, the bottom layer will be more than 1 operations processing. Suppose that a table has 10 million IDs, the average ID has 3 duplicate values, then put a table in front of the association will do more than 30 million times the operation of processing, at this time who wrote in

FineReport performance tuning methods, finereport Performance TuningThe basic idea of FineReport performance optimization is to properly set the memory size of the application server. Generally, the default memory configuration of the server is relatively small. In larger application projects, this memory is not enough

Need for Performance Tuning In this world of SAP programming, ABAP is the universal language. in most of the projects, the focus is on getting a team of ABAP programmers as soon as possible, handing over the technical specifications to them and asking them to church n out of the ABAP programs within the "given deadlines ". Often due to this pressure of schedules and deliveries, the main focus of m

GIS image cutting performance tuning and GIS image Performance TuningStatus Quo and objectives DellR920 Server, virtualized vmware vsphere 5.5 system, Guest System Windows Server 2012 R2. Deploy software ARCGIS 10. Image graph cutting test: the original cut takes 70 hours, And now it takes 17 hours. There is still room for further optimization. Debugging objectiv

I will share 11 practical tips on Java performance tuning and java Tuning Most developers think that performance optimization is a complicated problem and requires a lot of experience and knowledge. Yes, it is not wrong. It is not easy to optimize the application to achieve the best

A basic knowledge 1.1 What is the performance Before performance tuning, let's first look at what performance is. As for performance, I think everyone who has studied Java can list a few points or even talk about it. In the book "Java TM Platform

SQL Server Performance Tuning methodology and common tools, SQL Server Tuning In earlier articles, we mentioned the DETECT methodology in Performance Tuning. Here we will briefly review the DETECT methodology. Discover the problem: found the problem Lead e the conditions: E

I. Purpose It mainly tests the relationship between the rate of distributed computing in the hadoop cluster and the data size and the number of computing nodes. II. Environment Hardware: inspur nf5220. System: centos 6.1 The master node allocates 4 CPU and 13 Gb memory on the master machine centos. The remaining three slave nodes are on the KVM virtual machine of the master machine, and the system is centos6.1. Hardware configuration: Memory 1 GB, 4 CPUs, each hard disk with a capacity of GB. I

thickness of the arrow lines indicates the amount of data. In a graphical execution plan, each of the different operators has its own property values, and we can move the mouse over the operator icon to view Of course, you can also right-click on the icon, view the properties, go to the Properties panel and view more detailed property values The detailed indicator values for each operator in this case are described later, but there are a few key values here, which can be said to mention a lit

Linux server performance tuning skills, linux Server TuningPerformance tuning skills for 20 Linux servers Guide Linux is an open-source operating system that supports various hardware platforms. Linux servers are world-renowned. The main difference between Linux and Windows is that, by default, a Linux server does not provide a GUI (graphical user int

11 simple Java performance tuning techniques, java Tuning Most developers naturally think that performance optimization is complex and requires a lot of experience and knowledge. Well, it cannot be said that this is completely wrong. Optimizing applications to achieve optimal perfo