Comment document.getElementById("comment").setAttribute( "id", "adaed477e814bd95e18a0dc420835ce6" );document.getElementById("d9ff7d4539").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. SET LOCATION 'new location' Specifies the new location, which must be … Let us try to answer these questions in this blog post. MSCK REPAIR is a resource-intensive query and using it to add single partition is not recommended especially when you huge number of partitions. Not just in different locations but also in different file systems. It should just change the partition specification of the path. Partitioning is one of the important topics in the Hive. We can run below query to add partition to table. When the command is executed, the source table's partition folder in HDFS will be … DESCRIBE FORMATTED db_name.table_name PARTITION (name = value) Exactly, partition with webhdfs throws Partition location does not exist even if it exists. Hive Facts Conclusion. ALTER TABLE ADD PARTITION in Hive. I hope you will find it useful. You can use ALTER TABLE with DROP PARTITION option to drop a partition for a table. Partition is helpful when the table has one or more Partition keys. I have started blogging about my experience while learning these exciting technologies. After the upgrade, the location of managed tables or partitions do not change under any one of the following conditions: The old table or partition directory was not in its default location /apps/hive/warehouse before the upgrade. Also, it happens with both managed and external table. Post was not sent - check your email addresses! Instead of loading each partition with single SQL statement as shown above, which will result in writing lot of SQL statements for huge no of partitions, Hive supports dynamic partitioning with which we can add any number of partitions with single SQL execution. Sorry, your blog cannot share posts by email. When I tried using the following hive command it gives me error. rename hive table ALTER TABLE tbl_nm RENAME TO new_tbl_nm; In the above statement the table name was changed from tbl_nm to new_tbl_nm. ( Log Out /  The below example update the state=NC partition location from the default Hive store to a custom location /data/state=NC. alter table tstloc partition set location ‘hdfs:///tmp/ttslocnew/’ … and so on for each partition A massive pain if you have many partitions but you can build a script to generate the alter table statements from metadata if you have access to it (sys.tbls, sys.partitions) PARTITION (partition_spec) Specifies the partition with parameters partition_spec whose location you want to change. Updating & Renaming Partitions in Hive Tables With Alter table command, we can also update partition table location. This is supported only for tables created using the Hive format. Your email address will not be published. This was a short article, but quite useful. (C.C.P. Dynamic Partitioning in Hive. And then point those old partitions to S3 location. Specify all the same partitioning columns for the table, with a constant You can use Hive ALTER TABLE command to change the HDFS directory location or add new directory. Partitioning allows Hive to run queries on a specific set of data in the table based on the value of partition column used in the query. Using Alluxio will typically require some change to the URI as well as a slight change to a path. It simply sets the Hive table partition to the new location. '/apps/hive/warehouse/maheshmogal.db/order_partition/year=2014/month=02', '/maheshmogal.db/order_new/year=2019/month=12'. However, beginning with Spark 2.1, Alter Table Partitions is also supported for tables defined using the datasource API. We will learn how to get distinct values as well as count of distinct values. Partition is by physical division unless the parties agree on a sale or the court determines that partition by sale would be "more equitable." Hive is metastore for tables. You can get the location of the Hive partitions on HDFS by running any of the following Hive commands. ALTER TABLE SET command is used for setting the SERDE or SERDE properties in Hive tables. to design, install, operate, or inspect the installation as to the location of the fuses. Using Alluxio will typically require some change to the URI as well as a slight change to a path. We can also drop partition from hive tables. But what about data when you have an external hive table? The old table or partition directory is in a different encryption zone than the new warehouse directory. Without partitioning, any query on the table in Hive … Conversely, if it happens to be something, hive will return this something. on hive terminal run below command. Drop a single partition It does not change the locations associated with any tables/partitions under the specified database. Next, we will start learning about bucketing an equally important aspect in Hive with its unique features and use cases. ALTER TABLE Transaction ADD PARTITION (Day=date '2019-11-22') LOCATION '/apps/bank/cust_transactions/00'; 1. ALTER TABLE table_name PARTITION part_spec SET LOCATION path part_spec: : (part_col_name1=val1, part_col_name2=val2, ...) Set the location of the specified partition. Exchanging multiple partitions is supported in Hive versions 1.2.2, 1.3.0, and 2.0.0+ as part of HIVE-11745. To change the physical location where Impala looks for data files associated with a table or partition: ALTER TABLE table_name [PARTITION (partition_spec)] SET LOCATION 'hdfs_path_of_directory'; The path you specify is the full HDFS path where the … Hive doe not drop that data. Lets check it with an example. ALTER TABLE table_name PARTITION partition_spec RENAME TO PARTITION partition… Change location in the table properties using the following query. I was renaming my partition in a table that I've created using the location clause, and noticed that when after rename is completed, my partition is moved to the hive warehouse (hive.metastore.warehouse.dir). Of course we can. Now, what if we want to drop some partition or add a new partition to the table? Hive Partitions is a way to organizes tables into partitions by dividing tables into different parts based on partition keys. answered Feb 12, … The partition_spec specifies a column name/value combination in the form partition_col_name = partition_col_value.. SET LOCATION 'new location' Specifies the new location, which must be an Amazon S3 location. If a particular property was already set, ... --Changing File Location ALTER TABLE table_name [PARTITION partition_spec] SET LOCATION 'new_location'; Parameters table_name The name of an existing table. Hive deals with two types of table structures like Internal and External tables depending on the loading and design of schema in Hive. After creating the table you can move the data from hive table to HDFS with the help of this command: And you can check the table you have created in HDFS with the help of this command: The following query is used to add a partition to the employee table. 2. In this blog, we will learn how to sort rows in spark dataframe based on some column values. Copy the file from old_location to new_location using the File Browser. ALTER Statement on HIVE Table. In this blog, we will learn how to filter rows from spark dataframe using Where and Filter functions. Setting the location of individual partitions is allowed only for tables created using the Hive format. MSCK REPAIR is a resource-intensive query and using it to add single partition is not recommended especially when you huge number of partitions.