How to insert data into Hive from SparkSQL
- 1. Read the input csv file in SPARK and do the transformation of the data according to requirement.
- 2. Save the data back into an output csv file in HDFS
- 3. Push the data from the output csv into HIVE using HIVE -f or HIVE -e command from shell.
Full Answer
How to upload files from HDFS to hive using spark?
Our task is to create a data pipeline which will regularly upload the files to HDFS, then process the file data and load it into Hive using Spark. Create Hive tables depending on the input file schema and business requirements. Create a Kafka Topic to put the uploaded HDFS path into.
What is spark used for in Hadoop?
Due to its flexibility and friendly developer API, Spark is often used as part of the process of ingesting data into Hadoop. With Spark, you can read data from a CSV file, external SQL or NO-SQL data store, or another data source, apply certain transformations to the data, and store it onto Hadoop in HDFS or Hive.
How to import data from HDFS to hive using applicationlauncher?
Once the HDFS file path is available in the topic, it ( ApplicationLauncher) launches the Spark application ( ParseInputFile) which process the file and loads the data into a Hive table. Please see below code for details. import org.apache.kafka.clients.consumer. {ConsumerConfig, KafkaConsumer} import scala.collection.JavaConversions._
How to use sqlcontext in hive reports?
SQL context available as sqlContext.” is written. It means that you can use the sqlContext object to interact with the hive. Now, create a data frame hiveReports using below command: You have to pass your hive query in it. Whatever data is return by this query, will be available in the data frame.
How do you store data from Spark to Hive table?
Spark - Save DataFrame to Hive TableCreate DataFrame from existing Hive table.Save DataFrame to a new Hive table.Append data to the existing Hive table via both INSERT statement and append write mode.
How do I import data into Hive?
Navigate to the file you want to import, right-click it, select Import into Hive, and select how to import it: Import as CSV, Import as Apache Avro, or Import as Apache Parquet.
How does Hive connect to Spark?
How to Install Spark SQL Thrift Server (Hive) and connect it with Helical Insight. Download spark from the link (http://d3kbcqa49mib13.cloudfront.net/spark-2.1.0-bin-hadoop2.7.tgz) and extract tgz file in 'C:' drive. Run command in administrator mode and change directory to spark-2.1. 0-bin-hadoop2.
How do I load a CSV file into Hive using Spark?
System requirements :Step 1: Import the modules.Step 2: Create Spark Session.Step 3: Verify the databases.Step 4: Read CSV File and Write to Table.Step 5: Fetch the rows from the table.Step 6: Print the schema of the table.Conclusion.
How do I transfer data from HDFS to Hive?
Moving Data from HDFS to Hive Using an External TableMove .CSV data into HDFS: ... Create an external table. ... Create the ORC table. ... Insert the data from the external table to the Hive ORC table.More items...
How does data transfer from HDFS to Hive?
To query data in HDFS in Hive, you apply a schema to the data and then store data in ORC format. Incrementally update the imported data. Updating imported tables involves importing incremental changes made to the original table using Sqoop and then merging changes with the tables imported into Hive.
Can we run Hive on spark?
Hive on Spark provides Hive with the ability to utilize Apache Spark as its execution engine. set hive....Version Compatibility.Hive VersionSpark Versionmaster2.3.03.0.x2.3.02.3.x2.0.02.2.x1.6.04 more rows•Jul 25, 2014
What is difference between Hive and spark?
Hive and Spark are different products built for different purposes in the big data space. Hive is a distributed database, and Spark is a framework for data analytics.
Is spark SQL faster than Hive?
Speed: – The operations in Hive are slower than Apache Spark in terms of memory and disk processing as Hive runs on top of Hadoop.
How do I load multiple FIles in Hive?
Loading Multiple FIles in Hivehadoop fs -put Desktop/Docs/USPopulation1.txt /user/cloudera/multifiles.hadoop fs -put Desktop/Docs/USPopulation2.txt /user/cloudera/multifiles.CREATE EXTERNAL TABLE MultifilesEx( Name String, Street Int, ... ROW FORMAT DELIMITED.FIELDS TERMINATED BY ','LOCATION '/user/cloudera/multifiles'
How do I import a CSV file into Hadoop?
2 Answersmove csv file to hadoop sanbox (/home/username) using winscp or cyberduck.use -put command to move file from local location to hdfs. hdfs dfs -put /home/username/file.csv /user/data/file.csv.
How do you load data from external sources to HDFS?
You enter the Sqoop import command on the command line of your cluster to import data from a data source into HDFS. In HDFS, you can perform ETL on the data, move the data into Hive, and query the data....Import RDBMS data to HDFSImport an entire table.Import a subset of the columns.Import data using a free-form query.
How do I import an Excel file into Hive?
You can easily import tasks from a CSV file into a Hive project. To begin, download a sample CSV by going to your profile dropdown, then Import tasks, and selecting Import CSV. Then, fill out the following columns with your project details.
How do I import a CSV file into Hadoop?
SolutionStep 1: Sample CSV File. Create a sample CSV file named as sample_1. ... Step 2: Copy CSV to HDFS. Run the below commands in the shell for initial setup. ... Step 3: Create Hive Table and Load data. Now, you have the file in Hdfs, you just need to create an external table on top of it. ... Step 4: Verify data.
How do I load multiple FIles in Hive?
Loading Multiple FIles in Hivehadoop fs -put Desktop/Docs/USPopulation1.txt /user/cloudera/multifiles.hadoop fs -put Desktop/Docs/USPopulation2.txt /user/cloudera/multifiles.CREATE EXTERNAL TABLE MultifilesEx( Name String, Street Int, ... ROW FORMAT DELIMITED.FIELDS TERMINATED BY ','LOCATION '/user/cloudera/multifiles'
How do I import a CSV file into Hue?
0:083:45Hadoop Tutorial - Create Hive tables and load quoted CSV data in HueYouTubeStart of suggested clipEnd of suggested clipWe start by downloading a list of box this Bank is available as CSV CSV is comma separated valueMoreWe start by downloading a list of box this Bank is available as CSV CSV is comma separated value then we open up you on goes in the file browser.
In this post, we learn how to make a basic data pipeline using these popular Apache frameworks and the Scala language
In this post, we learn how to make a basic data pipeline using these popular Apache frameworks and the Scala language.
Initial Steps
Create Hive tables depending on the input file schema and business requirements.
Step 1
At first we will write Scala code to copy files from he local file system to HDFS. We use the copyFromLocal method as mentioned in the below code ( FileUploaderHDFS ). The below code copies the file from the path assigned to the localPathStr variable to the HDFS path assigned to the destPath variable.
Step 2
Write the code for a Kafka Consumer ( GetFileFromKafka) which is running in an infinite loop and regularly pools the Kafka Topic for the input message. Once the HDFS file path is available in the topic, it ( ApplicationLauncher) launches the Spark application ( ParseInputFile) which process the file and loads the data into a Hive table.
Step 3
Now, in this final step, we will write a Spark application to parse an XML file and load the data into Hive tables ( ParseInputFile) depending on business requirements.
Final Step
1. Make sure the FileUploaderHDFS application is synced with the frequency of input files generation.
What is hive2 URL?
Hive provides a JDBC connection URL string jdbc:hive2://ip-address:port to connect to Hive warehouse from remote applications running with Java, Scala, Python, Spark and many more.
Can you run HiveQL with Java?
In order to connect to Hive from Java & Scala program and run HiveQL you need to have <a href="https://mvnrepository.com/artifact/org.apache.hive/hive-jdbc">hive-jdbc</a> library as a dependency for maven or Gradel. For Maven, use the below artifact on your pom.xml.
Can you connect to hive from remove services?
Here you have learned by starting HiveServer2 you can connect to Hive from remove services using JDBC connection URL string and learned how to connect to Hive from Java and Scala languages.
Can you use data frame to join datasets?
You can use this data frame further to join with another dataset, filter or to perform transformation as per needs.
Do you have to pass hive query?
You have to pass your hive query in it. Whatever data is return by this query, will be available in the data frame.
Can you use hive table in Spark?
Assume you have the hive table named as reports. It is required to process this dataset in spark. Once we have data of hive table in the Spark data frame, we can further transform it as per the business needs. So let’s try to load hive table in the Spark data frame.
