hadoop hive tutorial

tableIn Hivecreate table t_emp(id int,name string,age int,dept_name string)ROW FORMAT DELIMITEDFIELDS TERMINATED BY ‘,‘;We build a text data file in LinuxEmp.txtImport dataLoading files into tablesHive does not does any transformation and loading data into tables. Load operations is currently pure copy/move operations that move datafiles into locations corresponding to Hive tables.LOAD DATA [LOCAL] inpath ' filepath ' [OVERWRITE] into TABLE tablename

(pubdate= ' 2010-08-22 ');Load data local inpath '/root/data.am ' into table beauty partition (nation= "USA");Select Nation, AVG (size) from the Beauties group by Nation ORDER by AVG (size);Two. UDFCustom UDF to inherit the Org.apache.hadoop.hive.ql.exec.UDF class implementation evaluatepublic class Areaudf extends Udf{private static MapCustom Function Call Procedure:1. Add a jar package (executed in the Hive command line)

It's inevitable that Hadoop, Hive, HBase will inevitably be the only thing that has started learning big data recently. Here is a record of your own understanding of these 3: 1, Hadoop: It is a distributed computing + Distributed File system, the former is actually MapReduce, the latter is HDFs. The latter can be operated independently, the former can be used

Today, when using hive to query the maximum value of a certain analysis data, there is a certain problem, in hive, the phenomenon is as follows:caused by:java.io.filenotfoundexception://http://slave1:50060/tasklog?attemptid=attempt_201501050454_0006_m_00001_1Then take a look at the Jobtracker log:2015-01-05 21:43:23,724 INFO Org.apache.hadoop.mapred.jobinprogress:job_201501052137_0004:nmaps=1 NReduces=1 max

Management of Hive (iii) Management of Hive (iii) remote service start of Hive remote service Port number 10000 Starting mode:hive --service hiveserver (Note: When you log in to hive with JDBC or ODBC programs to manipulate data, you must choose the remote service startup mode or our program is not conn

Because a lot of data is on the Hadoop platform, when migrating data from the hadoop platform to the hive directory, the default delimiter of hive is \, In order to smooth migration, you must specify the data delimiter when creating a table. The syntax is as follows: Create table test (uid string, name string) row for

In the example of importing other table data into a table, we created a new table score1 and inserted the data into the score1 with the SQL statement. This is just a list of the above steps. Inserting data Insert into table score1 partition (openingtime=201509values (1,' (2,'a'); -------------------------------------------------------------------- Here, the content of this chapter is complete. Analog data File Download Github Https://github.com/sinodzh/HadoopExample/t

In the previous article we implemented Java+spark+hive+maven implementation and exception handling, the test instance is packaged to run in the Linux environment, but when the Windows system runs directly, there will be Hive related exception output, This article will help you integrate the Hadoop+spark+hive developmen

Hive Chinese garbled problemAs we all know, we are using the MySQL storage hive metadata, you can execute with Chinese comments in the table file, to solve the problem of Chinese garbled:To set the metabase to Latin1 and set the encoding of the data table stored in Chinese to the utf-8 format, that is, the table stored in hive is utf-8.Some of the following are n

Hadoop Unzip the GZ file to a text file $ Hadoop fs-text/hdfs_path/compressed_file.gz | Hadoop Fs-put-/tmp/uncompressed-file.txt Unzip the local file Gz file and upload it to HDFs $ gunzip-c filename.txt.gz | Hadoop Fs-put-/tmp/filename.txt Using awk to process CSV files, refer to using awk and friends with