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. Does this mean we can have our partitions at diffrent locations? This will tie into Hive and Hive provides metadata to point these querying engines to the correct location of the Parquet or ORC files that live in HDFS or an Object store. You do need to physically move the data on hdfs yourself. Required fields are marked *. Moreover, we can create a bucketed_user table with above-given requirement with the help of the below HiveQL.CREATE TABLE bucketed_user( firstname VARCHAR(64), lastname VARCHAR(64), address STRING, city VARCHAR(64),state VARCHAR(64), post STRING, p… This will delete the partition from the table. … 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). Most ALTER TABLE operations do not actually rewrite, move, and so on the actual data files. It just removes these details from table metadata. Add partitions to the table, optionally with a custom location for each partition added. This will tie into Hive and Hive provides metadata to point these querying engines to the correct location of the Parquet or ORC files that live in HDFS or an Object store. It should just change the partition specification of the path. Partitioning is also one of the core strategies to improve query performance in a hive. alter table FpML_Data set location hdfs:/file_path_in_HDFS; HDFS: is value against fs.defaultFS property in core-site.xml . Drop or Delete Hive Partition. We can also drop partition from hive tables. Change ). We will learn how to get distinct values as well as count of distinct values. We are telling hive this partition for this table is has its data at this location. Here we will discuss how we can change table level properties. Hive Facts Conclusion. It should just change the partition specification of the path. Dynamic Partitioning in Hive. Alter command will change the partition directory. Updating & Renaming Partitions in Hive Tables With Alter table command, we can also update partition table location. Lets check it with an example. If you also want to drop data along with partition fro external tables then you have to do it manually. Drop a single partition hive> ALTER TABLE employee > ADD PARTITION (year=’2012’) > location '/2012/part2012'; Renaming a Partition. (C.C.P. Alter table statement is used to change the table structure or properties of an existing table in Hive. All the data files are directly written to this directory. Alter Table Transaction Add Partition (Day=date '2019-11-20') Partition(Day=date '2019-11-21'); Also we can specify the required location in the add partition statement to create the partition file. Hive is unable to read the full hdfs path due to space in "2016-07-26 15:00:00"; you can use below commands; hive> set part=2016-07-26 15:00:00; hive>ALTER TALBE sl_uploads PARTITION (hivetimestamp='2016-07-26 15:00:00') SET LOCATION '/data/dev/event/uploads/hivetimestamp=@part'; … 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. Getting distinct values from columns or rows is one of most used operations. This is supported only for tables created using the Hive format. 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. Can we have one partition at different locations? Partition is helpful when the table has one or more Partition keys. Your email address will not be published. Hive doe not drop that data. Solved: I am using hdp 2.4.2 (hive - 1.2.1.2.4). ALTER TABLE log_messages PARTITION (year = 2019, month = 12) SET LOCATION '/maheshmogal.db/order_new/year=2019/month=12'; 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. The partition statement lets Hive alter the way it manages the underlying structures of the table’s data directory. Partition is by physical division unless the parties agree on a sale or the court determines that partition by sale would be "more equitable." When the command is executed, the source table's partition folder in HDFS will be … Drop a single partition hive> ALTER TABLE sales DROP IF EXISTS PARTITION(year = 2020, quarter = 2); Drop multiple partitions With the below alter script, we provide the exact partitions we would like to delete. Here we are adding new information about partition to table metadata. The following table contains the fields of employeetable and it shows the fields to be changed (in bold). The below example update the state=NC partition location from the default Hive store to a custom location /data/state=NC. Using Alluxio will typically require some change to the URI as well as a slight change to a path. 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. In addition, we can use the Alter table add partition command to add the new partitions for a table. If nothing happens to be there, hive will not return anything. We have created partitioned tables, inserted data into them. hive> ALTER TABLE testraj.testtable PARTITION (filename="test.csv.gz") SET LOCATION "hdfs://ip-1-1-1-1.us-west-2.compute.internal:8020/apps/hive… In that case, you can set up a job that will move old data to S3 ( It is Amazons cheap store service. SQL. 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. Change ), You are commenting using your Twitter account. The ALTER TABLE statement changes the structure or properties of an existing Impala table.. Copy the file from old_location to new_location using the File Browser. Partitioning is one of the important topics in the Hive. 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). ALTER TABLE ADD PARTITION in Hive. PARTITION (partition_spec) Specifies the partition with parameters partition_spec whose location you want to change. Also, the location for a partition can be changed by below query, without moving or deleting the data from the old location. Let’s see a few variations of drop partition. You can use the Hive ALTER TABLE command to change the HDFS directory location of a specific partition. ( Log Out / The following queries rename the column name and column data type using the above data: 872.810, 872.820.). Partition keys are basic elements for determining how the data is stored in the table. You can use Hive ALTER TABLE command to change the HDFS directory location or add new directory. Let us try to answer these questions in this blog post. 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. Hive deals with two types of table structures like Internal and External tables depending on the loading and design of schema in Hive. So your latest data will be in HDFS and old partitions in S3 and you can query that hive table seamlessly. 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 is metastore for tables. ALTER TABLE Transaction ADD PARTITION (Day=date '2019-11-22') LOCATION '/apps/bank/cust_transactions/00'; 1. MSCK REPAIR is a useful command and it had saved a lot of time for me. Using Alluxio will typically require some change to the URI as well as a slight change to a path. The old table or partition directory is in a different encryption zone than the new warehouse directory. on hive terminal run below command. The court may order part of the property partitioned by sale and the remainder by physical division. 2. Exchanging multiple partitions is supported in Hive versions 1.2.2, 1.3.0, and 2.0.0+ as part of HIVE-11745. The Exchange Partition feature is implemented as part of HIVE-4095. If the path does not end with the old partition specification, we should probably throw an exception because renaming a partition should not change the path so dramatically, and not changing the path to reflect the new partition name could leave the partition in a very confusing state. Is there a way to alter the table ( Log Out / Using partitions, we can query the portion of the data. Create a free website or blog at WordPress.com. To get your data back, you just need to physically move the data on hdfs at the expected location: For partitioned tables it’s more involved. 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. ALTER TABLE some_table DROP IF EXISTS PARTITION(year = 2012); This command will remove the data and metadata for this partition. Let’s see a few variations of drop partition. ( Log Out / In Impala, this is primarily a logical operation that updates the table metadata in the metastore database that Impala shares with Hive. When I tried using the following hive command it gives me error. You can use ALTER TABLE with DROP PARTITION option to drop a partition for a table. Sorry, your blog cannot share posts by email. ALTER Statement on HIVE Table. Post was not sent - check your email addresses! DESCRIBE FORMATTED db_name.table_name PARTITION (name = value) 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. Change location in the table properties using the following query. ALTER TABLE SET command is used for setting the SERDE or SERDE properties in Hive tables. '/apps/hive/warehouse/maheshmogal.db/order_partition/year=2014/month=02', '/maheshmogal.db/order_new/year=2019/month=12'. The reason is that the location property is only metadata, telling hive where to look without any effect on said location (except at creation time, where the location will be created if it does not exist for managed tables). 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: Without partitioning, any query on the table in Hive … ALTER SCHEMA was added in Hive 0.14 (HIVE-6601). The partition_spec specifies a column name/value combination in the form partition_col_name = partition_col_value. For example, below command will ALTER TABLE some_table PARTITION (year = 2012) SET LOCATION 'hdfs://user/user1/some_table/2012'; Here is the alter command to update the partition of the table sales. Next, we will start learning about bucketing an equally important aspect in Hive with its unique features and use cases. It does not change the locations associated with any tables/partitions under the specified database. Solution: ALTER TABLE PARTITION SET LOCATION does , To set the location for a single partition, include the PARTITION clause. You also need to relocate every partition to point at the new folder structure, i.e. Hive Partitions is a way to organizes tables into partitions by dividing tables into different parts based on partition keys. ( Log Out / Also, it happens with both managed and external table. With Alter table command, we can also update partition table location. Change ), You are commenting using your Google account. From Hive v0.8.0 onwards, multiple partitions can be added in the same query. However, beginning with Spark 2.1, Alter Table Partitions is also supported for tables defined using the datasource API. MSCK REPAIR is a resource-intensive query and using it to add single partition is not recommended especially when you huge number of partitions. hive> ALTER TABLE sales PARTITION(year = 2020, quarter = 2) SET LOCATION 'hdfs://user/svc_account/fixed_date/2020/2'; Drop a Hive partition. Distinct Rows and Distinct Count from Spark Dataframe, Adding White Spaces to Data in Spark Dataframe. Exactly, partition with webhdfs throws Partition location does not exist even if it exists. Your email address will not be published. But what about data when you have an external hive table? Conversely, if it happens to be something, hive will return this something. 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. I like to learn and try out new things. It simply sets the Hive table partition to the new location. to design, install, operate, or inspect the installation as to the location of the fuses. Alter command will change the partition directory. Hope to see you there. Drop a Hive partition. You can get the location of the Hive partitions on HDFS by running any of the following Hive commands. The syntax of this command is as follows. In this blog, we will learn how to filter rows from spark dataframe using Where and Filter functions. I hope you will find it useful. answered Feb 12, … In the last few articles, we have covered most of the details of Partitioning in Hive. Internal tables Internal Table is tightly coupled in nature.In this type of table, first we have to create table and load the data. The old table or partition directory is in a different encryption zone than the new warehouse directory. And then point those old partitions to S3 location. If you browse the location of the data directory for a non-partitioned table, it will look like this: .db/. Change ), You are commenting using your Facebook account. Note that there is no impact on the data that resides in the table. Set partition location. Solution: ALTER TABLE PARTITION SET LOCATION does , To set the location for a single partition, include the PARTITION clause. You can learn more about it here). The following query is used to add a partition to the employee table. 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. Alter command will change the partition directory. Now, what if we want to drop some partition or add a new partition to the table? You can decide where on hdfs you put the data of a table, for a managed table: Now if you want to move this table to another location for any reason, you might run the following statement: will return an empty set. This was a short article, but quite useful. I am passionate about Cloud, Data Analytics, Machine Learning, and Artificial Intelligence. Could reproduce it in my laptop using version 308 and prestodb/hdp2.6-hive:11 docker image. Hey, Basically When we create a table in hive, it creates in the default location of the hive warehouse. jdbc:hive2://127.0.0.1:10000> ALTER TABLE zipcodes PARTITION(state='NC') SET LOCATION '/data/state=NC'; ALTER TABLE table_name PARTITION partition_spec RENAME TO PARTITION partition… Hive Table Partition Location If you have a partitioned table on Hive and the location of each partition file is different, you can get each partition file location from HDFS using the below command. Specifies the partition with parameters partition_spec whose location you want to change. MSCK REPAIR is a resource-intensive query and using it to add single partition is not recommended especially when you huge number of partitions. hdfs dfs -ls
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