1, Syntax description of load statement in Hive
Hive Load statement will not do any conversion work when loading data, but simply copy / move the data file to the address corresponding to hive table. The syntax format is as follows:
LOAD DATA [LOCAL] INPATH 'filepath' [OVERWRITE] INTO TABLE tablename \
[PARTITION (partcol1=val1, partcol2= ...
Posted by whizzykid on Thu, 21 May 2020 21:08:45 -0700
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With the popularity of artificial intelligence and big data in recent years ...
Posted by POG1 on Sat, 09 May 2020 02:40:47 -0700
1, Hadoop source compilation supports Snappy compression
1.1 resource preparation
1.2 jar package installation
1.3 compiling source code
2, Hadoop compression configuration
Posted by pavanpuligandla on Tue, 05 May 2020 23:29:55 -0700
Lateral view is used with split, expand and other UDTF to split a row of data into multiple rows. On this basis, the split data can be aggregated. Lateral view first calls UDTF for each row of the original table, and UDTF will split a row into one or more rows. Then lateral view combines the results to produce a virtual table that supports alia ...
Posted by ayzee01 on Sat, 02 May 2020 19:41:55 -0700
Window function is often used in work and often asked in interview. Do you know the implementation principle behind it?
Starting from the problems encountered in a business, this paper discusses the data flow principle of window function in hsql, and gives a solution to this problem at the end of the article.
1, Business background
Posted by moiseszaragoza on Mon, 06 Apr 2020 04:05:56 -0700
When did Apache Spark start to support the integrated Hive feature? I believe that as long as readers have used Spark, they will say that this is a long time ago.
When does Apache Flink support integration with Hive? Readers may be confused. Haven't they supported it yet, haven't they used it? Or the latest version only supports it, but the fu ...
Posted by elfeste on Fri, 27 Mar 2020 03:09:45 -0700
Hive can only be installed on one node
1. Upload tar package
tar -zxvf hive-1.2.1.tar.gz -C /apps/
3. Install mysql database (switch to root user) (there are no limitations on where to install, only nodes that can connect to the hadoop cluster)
4. Configure hive
(a) Configure the HIVE_HOME environment variable vi conf/hive-e ...
Posted by gyash on Thu, 26 Mar 2020 21:12:15 -0700
1. Installation address
1) Flume official website address
2) Document view address
3) Download address
2. Installation and deployment
1) Upload apache-flume-1.7.0-bin.tar.gz to the / opt/softwa ...
Posted by The14thGOD on Fri, 13 Mar 2020 19:40:57 -0700
1. Three installation methods of hive
Three installation methods of Hive are introduced on Hive official website, corresponding to different application scenarios. In the final analysis, the storage location of metadata is different.
Embedded mode (metadata is saved in the embedded derby database, al ...
Posted by akreation on Thu, 27 Feb 2020 02:23:22 -0800
from pyspark import SparkContext
from pyspark import SparkConf
conf=SparkConf().setAppName("lg").setMaster('local') #local means to run 4 kernels locally
1. Parallel and collect
The parallelize function converts the list obj ...
Posted by moomsdad on Fri, 21 Feb 2020 02:13:19 -0800