This tool can be used to initialize the metastore schema for the current Hive version. you can choose which you want to create Thanks tiru -- --- You received this message because you are subscribed to the Google Groups "CDH Users" group. The Hive metastore database stores metadata for such things as the schemas and tables that are stored in Hive. Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /homepages/0/d24084915/htdocs/ingteam/7cq1/e3y3. xml on the classpath. (A standalone bee). Managed table: In managed table, both the data and schema are under control of Hive; External table: In the external table, only the schema is under the control of Hive. Initialization script completed schemaTool completed. It exposes the tabular data of Hive metastore to other Hadoop applications. get_records (self, hql, schema='default') [source] ¶ Get a set of records from a Hive query. php(143) : runtime-created function(1) : eval()'d. The table created in Presto using avro_schema_url behaves the same way as a Hive table with avro. This Hive tutorial describes how to configure Hive Metastore to MySQL. We can interact with Hive using methods like. RuntimeException: Hive metastore database is not initialized. it has 2 parts services and data. Derby is an embedded database backed by local disk. Follow the instructions below to install and configure this check for an Agent running on a host. named_hive_partition_sensor. If you don’t want to use existing schemas (or there are no appropriate schemas in the Hive Metastore), you need to create a new one. What is Hadoop? Answer: Hadoop is a distributed computing platform is written in Java. It only drops schema information from hive metastore at time of drop tables. Derby is an embedded database backed by local disk. OLAP Cube QL which is a high level SQL like language to query and describe data sets organized in data cubes. There are 4 main components as part of Hive Architecture. I should note that we don't trust our emr cluster to stick around so we design for it to just die. Each query through Presto is recorded to a Hive table for auditing purposes. True: Verify that version information stored in metastore matches with one from Hive jars. In the CREATE EXTERNAL SCHEMA statement, specify the FROM HIVE METASTORE clause and provide the Hive metastore URI and port number. See Overview of Impala Metadata and the Metastore for the information about the way Impala uses metadata and how it shares the same metastore database as Hive. Big SQL uses these low level API's of Hive to physically read/write data. Often, when traditional data sources can’t handle the processing of large SQL queries, users can import data into Hive and then run their queries there. the target hive table is definited in a datastore: name: mytable resource name : mytable datastore type: table. HIVE : Show Commands on DWH4U | These statements provide a way to query the Hive metastore for existing data and metadata accessible to this Hive system. It provides single process storage, so when we use Derby, we cannot run instances of Hive CLI. External Hive Metastore Service. uri: The URI(s) of the Hive metastore to connect to using the Thrift protocol. ALTER SCHEMA changes the definition of a schema. hive metastore Could not create the Failed to create the is not konw to the m database schema not available to the ubuntu failed to create the create database please use a kernel Please use Android T userinfo is not map The connection to adb is down How to Use Qt create create() Create schema Schema schema schema Hadoop hive Hive metastore database is not initialized. Spark Check If File Exists. Before you can run the Hive metastore with a remote MySQL database, you must configure a connector to the remote MySQL database, set up the initial database schema, and configure the MySQL user account for the Hive user. It can also handle upgrading the schema from an older version to current. For Hive 2. $ hadoop fs -mkdir /tmp. Since then the only thing we've needed to do is hack a few o the baseline scripts used by emr to launch hive so that it uses more heap. Due to this reason, we must reconcile Hive metastore schema with Parquet schema when converting a Hive metastore Parquet table to a Spark SQL Parquet table. This url where the schema is located, must be accessible from the Hive metastore and Presto coordinator/worker nodes. Hence this is marked as unstable. to/2JYxnQe Priyanka, an AWS Cloud Support Engineer, shows you how to upgrade Hive Metastore schema version on EMR. (Table with 3 columns or 5 columns or 6 columns). Files that contain the data for the table are created on each of the nodes, and the Hive metadata keeps track of. 1 Metastore Server With Mysql-5. /schematool -initSchema -dbType ) to create the schema. The Replicat process can be aborted by adding the following to the Replicat configuration file (. using hive metastore server, which then connects in the background to a relational db such as mysql for schema manifestation. The SQL Query is translated to a YARN job then executed on our Hadoop cluster. Hive does not removed or drop any thing related to source file. verification to false in hive-site. This Hive tutorial describes how to configure Hive Metastore to MySQL. To access GCS data that is not yet mapped in the Hive metastore you need to provide the schema of the data, the file format, and the data location. sh as shown in below Mention the HADOOP_HOME Path in hive. Find more details in the AWS Knowledge Center: https://amzn. In Hive, the data is stored in HDFS and the table, database, schema, and other HQL definitions are stored in a metastore. 0) or createGlobalTempView on our spark Dataframe. * Legacy catalog for interacting with the Hive metastore. Often, when traditional data sources can’t handle the processing of large SQL queries, users can import data into Hive and then run their queries there. What is Hadoop? Answer: Hadoop is a distributed computing platform is written in Java. 0, make sure that the metastore client has the write permission to the metastore database (to prevent the issue described in HIVE-9749 ). transport = TSocket. 0 app on emulator/device. To configure a PostgreSQL DB instance as the external metastore for Hive: 1. Additionally, Kudu's only restriction on table names is that they be a valid UTF-8 encoded string. Hive stores the schema of the Hive tables in a Hive Metastore. TBinaryProtocol(transport). This Hive tutorial describes how to configure Hive Metastore to MySQL. Apart from the database configuration options you need to specify the hive metastore version, for the current HDInsight version this is 2. Hive单机启动遇到metastore 未初始化错误, Exception in thread "main" java. RDBMS does not require any schema initialization other than database creation. It provides client access to this information by using metastore service API. What is Hadoop? Answer: Hadoop is a distributed computing platform is written in Java. 0 Initialization script hive-schema-2. Hive Metastore. 0 release onwards Hive DATABASE is also called as SCHEMA. TBinaryProtocol(transport). Upgrading MetaStore schema from 0. This tool can be used to initialize the metastore schema for the current Hive version. As connector tasks are long running, the connections to the Hive metastore are kept open until tasks are stopped. Hive uses a method of querying data known as “schema on read,” which allows a user to redefine tables to match the data without touching the data. 0+): SHOW VIEWS [in/from ] To count views directly in the underlying metastore database: select count(1) from tbls where tbl_type = ‘VIRTUAL. Before you can run the Hive metastore with a remote MySQL database, you must configure a connector to the remote MySQL database, set up the initial database schema, and configure the MySQL user account for the Hive user. Originally I was messing around with the schema option and when I would do a search I could not find my tables that were in hive. " In this mode the metastore service runs in its own JVM process and other services, such as HiveServer2, HCatalog, and Apache Impala communicate with the metastore using the Thrift network API. Alternatively, an existing SQL database may be used to persist metadata across multiple clusters. (A standalone bee). 1 metastore hive configuration HIve metastore hive mysql Hive to mysql install mysql install mysql and dependencies Metastore Metastore corrupted MySQL mysql. dir in the Hive config file hive-site. Hive records the schema version in the metastore database and verifies that the metastore schema version is compatible with the Hive binaries that are going to access the metastore. Due to this reason, we must reconcile Hive metastore schema with Parquet schema when converting a Hive metastore Parquet table to a Spark SQL Parquet table. The Hive configuration properties that implicitly create or alter the existing schema are disabled by default. 7) Explain what is Metastore in Hive? Metastore is a central repository in Hive. compatibility configuration. Hive-Metastore: All hive implementation need a metastore service, where it stores metadata. Install Hive and configure Hive Metastore with MySQL Hive is designed for data summarization, ad-hoc querying, and analysis of large volumes of data. Hive is supported in Hadoop distributions. Configure the MySQL service and connector. When using Hadoop, a cautious practitve can be to only use lowercase and no , nor. 1, by default the Ambari Server is configured to use PostgreSQL, the Hive Metastore service is configured to use MySQL, and the Oozie service is configured to use Derby. The metadata (table schema) stored in the metastore is corrupted. We decided to write this book to fill that gap. Hive Metastore is critical part of Hadoop architecture as it acts as a central schema repository which can be used by other access tools like Spark, Interactive Hive (LLAP), Presto, Pig and many other. In the default Hive configuration, reconnecting to the Hive metastore creates a new connection. External Apache Hive Metastore. Connecting to a Kafka cluster; Kafka security; Miscellaneous. So, Both SCHEMA and DATABASE are same in Hive. Hive MetaStore Schema Upgrade Failed When Upgrading CDH5. 12 introduced a new table "VERSION" in Hive metastore, that is why Hive can recognize the metastore version. One of the greatness (not everything is great in metastore, btw) of Apache Hive project is the metastore that is basically an relational database that saves all metadata from Hive: tables, partitions, statistics, columns names, datatypes, etc etc. 2 and Hive 1. Amazon EMR release versions 5. Hive Meta-store Architecture. Hadoop Certification - CCA - Create a table in the Hive metastore using Avro Extracting Avro schema from Avro data files using avro-tools Hadoop Certification - CCA - Hive Metastore. The metadata for Hive tables and partitions are stored in the Hive Metastore. This will reduce some manual process. All Hive implementations need a metastore service, where it stores metadata. Hive MetaStore Schema Upgrade Failed When Upgrading CDH5. compatibility configuration. When using Hadoop, a cautious practitve can be to only use lowercase and no , nor. Drill caches Hive metadata in a Hive metastore client cache that resides in Drill instead of accessing the Hive metastore directly. hive into packages. It provides client access to this information by using the metastore service API. Note: Before attempting to upgrade the Hive metastore to use HDFS HA, shut down the metastore and back it up to a persistent store. To configure the Hive metastore to use HDFS HA, change the records to reflect the location specified in the dfs. Make sure to provide a valid value for hive. ” The metastore is a relational database containing the detailed descriptions of the Hive schema, including column types, owners, key and value data, table statistics, and so on. uris according to your Hive configurations. All Hive implementations need a metastore service, where it stores metadata. 0 and later come with the PostgreSQL JDBC driver in the Hive library path. * Legacy catalog for interacting with the Hive metastore. Hive Database Commands Note. The answer lies in the enterprise. When you run Drop table command, Spark checks whether table exists or not before dropping the table. The Hive metastore. The metadata (table schema) stored in the metastore is corrupted. There are 4 main components as part of Hive Architecture. When you create a Hive table, the table definition (column names, data types, comments, etc. One good example of this difference in action is in forming table schemas. Hive-Metastore. This is useful if each worker node has. xml file, it is the responsibility of the user to provide one. Hive jobs are converted into a MR plan which is then submitted to the Hadoop cluster for execution. It stores metadata for Hive tables (like their schema and location) and partitions in a relational database. Delta supports schema evolution and queries on a Delta table automatically use the latest schema regardless of the schema defined in the table in the Hive metastore. Importing data into Hive is as simple as adding the --hive-import option to your Sqoop command line. The following are top voted examples for showing how to use org. 0 or later, you can configure Hive to use the AWS Glue Data Catalog as its metastore. The above statement registers the HBase table named bar in the Hive metastore, accessible from Hive by the name foo. By default metastore would be derby , but generally we configure it to be either MySql or PostgreSql so that we could know the metadata and get the informations out. Note : Before attempting to upgrade the Hive metastore to use HDFS HA, shut down the metastore and back it up to a persistent store. xml, the context automatically creates a metastore called metastore_db and a folder called warehouse in the current directory. Configure the MySQL service and connector. databases, tables, columns, partitions. We can run almost all the SQL queries in Hive, the only difference, is that, it runs a map-reduce job at the backend to fetch result from Hadoop Cluster. External Hive Metastore Service. It is implemented using tables in a relational database. The metadata for Hive tables and partitions are stored in the Hive Metastore. Failed to start database 'metastore_db' with class loader org. Metastore Connection Driver : com. hive HBase Metastore - Improving Hive with a Big Data Metadata Storage Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. sh ( To communicate with the Hadoop eco system we are defining Hadoop Home path in hive config field) Open the hive-config. 0 Initialization script hive-schema-3mssql. (Note that superusers have. Creating a standalone HiveMetastore (Not in Hadoop cluster) When benchmarking Presto database on top of S3 files, I found out that I have to install a Hive metastore instance. It enables users with differ. 0 or later, you can configure Hive to use the AWS Glue Data Catalog as its metastore. Hive Metastore Introduction Hive Metastore is a central repository for Hive metadata. sql Test the Hive Metastore configuration with. sql Error: FUNCTION ‘NUCLEUS_ASCII’ already exists. How about the same in Hive? In the case of Hive there is a metastore which acts as a metadata for the databases, Hive uses this database to store the tables, partitions, databases, serde in this database. Using Amazon EMR version 5. This section presents the Apache Thrift file that is used to generate and test a JavaScript API. These examples are extracted from open source projects. So, let’s start Hive Metastore Tutorial. Viewing Hive Schema and Table Metadata When using Hive, you access metadata about schemas and tables by executing statements written in HiveQL (Hive's version of SQL) such as SHOW TABLES. The information schema is an ANSI standard set of metadata tables that you can query to return information about all of your Drill data sources (or schemas). It enables users with differ. The _HOST placeholder can be used in this property value. Step 1- Fetch the Schema From all Environments To fetch the schema we use the hive metastore api via the hive-thrift. It tells Hive where your data files live in HDFS, what type of data they contain, what tables they belong to, etc. However, Presto or Athena uses the schema defined in the Hive metastore and will not query with the updated schema until the table used by Presto or Athena is redefined to have the. Consider the following example of employee record using Hive tables. This blog attempts to provide an overview of the metastore schema of Hive and Oozie in the PaaS offering of Hortonworks on Azure, called HDInsight. A key piece of the infrastructure is the Apache Hive Metastore, which acts as a data catalog that abstracts away the schema and table properties. We want the Hive Metastore to use PostgreSQL to be able to access it from Hive and Spark simultaneously. transport = TSocket. It also enables you via a command line tool to initialise (create) the schema and also upgrade it from one version to the next. These examples are extracted from open source projects. Hive supporters and alternatives. * This is still used for things like creating data source tables, but in the future will be. The reconciliation rules are: Fields that have the same name in both schema must have the same data type regardless of nullability. Property Name Description Default; hive. Java is a very wordy language so using Pig and Hive is simpler. Hive derby/mysql installation; mysql 5. 0 MetaStore schema. It tends to the limitation that only one session can be served at any given point of time. The Hive metastore. Before attempting this project we strongly recommend that you read through all of the steps in this document and familiarize yourself with the required tools. When you run Drop table command, Spark checks whether table exists or not before dropping the table. Please use schematool (e. This is a step by step guide on How to Configure MySQL Metastore for Hive in place of Derby Metastore (Default). To rename a schema you must also have the CREATE privilege for the database. Also disable automatic schema migration attempt. enabled": "false" You are now able to query off your Hive and HBase tables through SQLLine. At the same time, query workloads on Hive have become much more diverse. Hive integration is supported if BACKWARD, FORWARD and FULL is specified for schema. We also have gone through Hive clients and Hive services in brief. The Hive properties to implicitly create or alter the existing schema are disabled by default. schema - target schema, default to 'default'. Hive has different deployment options, security considerations should take into account different deployments Authentication is only supported at Metastore, not on HiveServer, web interface, JDBC Authorization is enforced at the query layer (Driver). IsolatedClientLoader. php(143) : runtime-created function(1) : eval()'d. Additionally, Kudu's only restriction on table names is that they be a valid UTF-8 encoded string. By default, Hive uses built-in Derby SQL server. 0, make sure that the metastore client has the write permission to the metastore database (to. Hive Metastore provides flexibility in schema designs and helps in data serialization or data deserialization. Hive stores the schema version in the metastore database. Go to the folder path where hive-schema-version available using CD command at ubuntu server (Crucial step) 3. Step 1- Fetch the Schema From all Environments To fetch the schema we use the hive metastore api via the hive-thrift. This is called as the embedded metastore configuration. ; It provides an SQL-like language to query data. You should adjust hive. To suppress the schema check and allow the metastore to implicitly modify the schema, you need to set a configuration property hive. nameservices property, using the Hive metatool to obtain and change the locations. Hive gives a SQL-like interface to query data stored in various databases and file systems that integrate with Hadoop. Amazon EMR release versions 5. Managed table: In managed table, both the data and schema are under control of Hive; External table: In the external table, only the schema is under the control of Hive. True: Verify that version information stored in metastore matches with one from Hive jars. verification. What is Hive Metastore? As we know, the database is among the most important and powerful parts of any organization. It provides single process storage, so when we use Derby, we cannot run instances of Hive CLI. Hi, I am trying to install CDH 6 (I think I chose "Essentials" services package with Hive) but the "Run a set of services for the first time" fails on "Validating the Hive Metastore schema". Update Hive Metastore. When connecting to the Hive metastore, the Hive connector will substitute in the hostname of the worker node Presto is running on. using hive jdbc server, called HiveServer2, which runs on port 10001, generally. Follow the instructions below to install and configure this check for an Agent running on a host. TBufferedTransport(transport) protocol = TBinaryProtocol. check if the current schema version in metastore matches the Hive version Methods inherited from class java. Hive-Metastore. nameservices property, using the Hive metatool to obtain and change the locations. Hive is a Data Warehousing package built on top of Hadoop. Lyft’s data warehouse is on Hive and all physical partitions are stored in S3. Before you can run the Hive metastore with a remote MySQL database, you must configure a connector to the remote MySQL database, set up the initial database schema, and configure the MySQL user account for the Hive user. Hive by default comes with Derby as its metastore storage, which is suited only for testing purposes and in most of the production scenarios it is recommended to use MySQL as a metastore. Cloudera recommends that you deploy the Hive metastore, which stores the metadata for Hive tables and partitions, in "remote mode. The default configuration uses Hive 1. All the metadata for Hive tables and partitions are accessed through the Hive Metastore. Details such as the execution of queries, format, location and schema of hive table inside the Metastore etc. sh as shown in below Mention the HADOOP_HOME Path in hive. Let us take an example and look into this. Metastore is place where data about tables , table structure is stored. Configure the MySQL service and connector. ERROR Datastore. 1, we need to run the schematool command below as an initialization step. As with the Hbase NoSQL database, it is very commonly implemented as part of Hadoop distributed data processing applications. literal set. HIVE : Show Commands on DWH4U | These statements provide a way to query the Hive metastore for existing data and metadata accessible to this Hive system. Since then the only thing we've needed to do is hack a few o the baseline scripts used by emr to launch hive so that it uses more heap. 1 Hive_metastore Thrift Schema. verification false datanucleus. I am trying to use it without hive setup (spark-standalone), so it prints something like this: hive_ctx. For example, if you have ORC or Parquet files in an GCS bucket my_bucket, you will need to execute a query:. It has 2 components: A Service to which the Hive Driver connects to and queries for the database schema. uris according to your Hive configurations. It is divided into 2 pieces: a service and the backing store for the data. The metastore is capable of syncing catalog data with other metadata services in the Hadoop ecosystem. External tables make processing data possible even without actually storing it into HDFS. If you create the table through Impala, you must include column definitions that match the fields specified in the Avro schema. uris if you are connecting to a remote metastore. When you create a Hive table, the table definition (column names, data types, comments, etc. GitHub Gist: instantly share code, notes, and snippets. In this post, I show you how to perform exploratory analysis on large datasets stored in your data warehouse and cataloged in your AWS Glue Data Catalog from your Amazon SageMaker notebook. schema - target schema, default to 'default'. xml file must be copied to HDFS and in the Hive action configuration section it must be set in the oozie. The details are stored in the metastore. Metastore used for storing schema information. This enables the Hadoop FS and MapR FS destinations to write drifting Avro or Parquet data to HDFS or MapR FS. listeners list of comma seperated listeners for metastore events. Install Hive with MySQL MetaStore Apache Hive Metastore It consists of relational database for store the data (such as Hive tables schema,partition, bucket) and Metastore Service API for accessing information stored in relational database. The metastore could be any RDBMS database, such as MySQL or Oracle. When the connector observes a schema change, it projects to the proper schema according to the schema. It provides client access to this information by using metastore service API. Details such as the execution of queries, format, location and schema of hive table inside the Metastore etc. If the data loaded and the schema does not match, then it is rejected. Details such as the execution of queries, format, location and schema of hive table inside the Metastore etc. 12 kylin can start, but can not load table , Apache Kylin Search everywhere only in this topic. Hive uses already stored datain File system) Hive implementation required a metastore service using any RDBMS. To rename a schema you must also have the CREATE privilege for the database. If you have a Hive metastore associated with your HDFS cluster, Sqoop can also import the data into Hive by generating and executing a CREATE TABLE statement to define the data’s layout in Hive. Hive Metastore and Impala UnknownHostException during table creation Travis Campbell in Hadoopery | 2017/05/24. sh as shown in below Mention the HADOOP_HOME Path in hive. [jira] [Commented] (HIVE-3999) Mysql metastore upgrade script will end up with different schema than the full schema load:. So, let’s start Hive Metastore Tutorial. The Hive metastore has an issue wherein it tries to be non-strict about the schema version of the metastore db, and it can try to update the schema version if it finds that it is itself a newer version. The Hive table and database definitions and mapping to the data in HDFS is stored in a metastore. - Explored and setup Alluxio Distributed caching over storage buckets and enable Presto query engine to work over it using hive metastore integration. In the CREATE EXTERNAL SCHEMA statement, specify the FROM HIVE METASTORE clause and provide the Hive metastore URI and port number. This article will go through the steps to upgrade metastore schema using Hive schema tool, taking PostgreSQL for example. Execute use metastore; command at mysql 5. This replaced MySQL as data source in Metabase analytics and improved the query performance by ~70%. By default, the Hive Metastore stores all Hive metadata in an embedded Apache Derby database in MapR-FS. There are three modes of configuring a metastore:. verification to false in hive-site. When the connector observes a schema change, it projects to the proper schema according to the schema. TSocket(host, port) transport = TTransport. Update Hive Metastore. php(143) : runtime-created function(1) : eval()'d. The _HOST placeholder can be used in this property value. hive metastore Could not create the Failed to create the is not konw to the m database schema not available to the ubuntu failed to create the create database please use a kernel Please use Android T userinfo is not map The connection to adb is down How to Use Qt create create() Create schema Schema schema schema Hadoop hive Hive metastore database is not initialized. dir configuration parameter present in the hive-site. literal set. autoCreateTables = true Также при импорте данных с hdfs в hive таблицы возникает такая ошибка: "Cannot perform operation. Alternatively, an existing SQL database may be used to persist metadata across multiple clusters. 0, make sure that the metastore client has the write permission to the metastore database (to. Hive MetaStore Schema Upgrade Failed When Upgrading CDH5. Databricks provides a managed Apache Spark platform to simplify running production applications, real-time data exploration, and infrastructure complexity. The Hive metastore is provisioned automatically when an HDInsight cluster is created. Hive metadata is stored externally in the “metastore. Sqoop’s import tool’s main function is to upload your data into files in HDFS. How about the same in Hive? In the case of Hive there is a metastore which acts as a metadata for the databases, Hive uses this database to store the tables, partitions, databases, serde in this database. For each table mapped in the process_name. transport = TSocket. ALTER SCHEMA changes the definition of a schema. databases, tables, columns, partitions. Hive gives a SQL-like interface to query data stored in various databases and file systems that integrate with Hadoop. so that query time will be minimize. 0 app on emulator/device. When you are using Drill to connect to multiple data sources, you need a simple mechanism to discover what each data source contains. Derby is the default database for the Hive metastore. The following are top voted examples for showing how to use org. -> Set Permissions for read/write on those folders. Hive/HCatalog On the Hive Metastore machine, install the appropriate JDBC. We also have gone through Hive clients and Hive services in brief. dir configuration parameter present in the hive-site. Java is a very wordy language so using Pig and Hive is simpler. dir property determines the location where hive contents will be stored in HDFS, you should have created this direcotry on HDFS before working with Hive like below. The table created in Presto using avro_schema_url behaves the same way as a Hive table with avro. When using Hadoop, a cautious practitve can be to only use lowercase and no , nor. Hive Metastore is the central repository for metadata. Hive accomplishes both of these features by providing a metdata repository that is tightly integrated with the Hive query processing system so that data and metadata are in sync. Delta supports schema evolution and queries on a Delta table automatically use the latest schema regardless of the schema defined in the table in the Hive metastore. 1 in us-west-2 on Amazon. If you don’t want to use existing schemas (or there are no appropriate schemas in the Hive Metastore), you need to create a new one. The reconciliation rules are: Fields that have the same name in both schema must have the same data type regardless of nullability. In traditional RDBMS a table schema is checked when we load the data. It has 2 components: A Service to which the Hive Driver connects to and queries for the database schema. To avoid Hive metastore implicitly inserting into VERSION table, please set hive. defaults property. This url where the schema is located, must be accessible from the Hive metastore and Presto coordinator/worker nodes. The connector takes the value from the Kafka Connect SinkRecords and inserts a new entry to Hive. What it does is let you create tables and load external files into tables using SQL. Hive Database Commands Note. my_table", if a dot is found, the schema param is disregarded:type table. sql Error: FUNCTION ‘NUCLEUS_ASCII’ already exists. We can use 'schematool' or directly source the hive-schema-3. It will consist of the features such as Distributed File System and MapReduce Processing. For example if we have 5 column (name, job, dob, id, salary) in the data file present in hive metastore then, we can have multiple schema by choosing any number of columns from the above list. CreateOrReplaceTempView on spark Data Frame Often we might want to store the spark Data frame as the table and query it, to convert Data frame into temporary view that is available for only that spark session, we use registerTempTable or CreateOrReplaceTempView (Spark > = 2. -createUser : create the Metastore user and schema.