hive alter partition location
Conversely, if it happens to be something, hive will return this something. DESCRIBE FORMATTED tbl_name PARTITION(dt=20131023); SHOW TABLE EXTENDED LIKE tbl_name PARTITION(dt=20131023); Alternatively, you can also get by running HDFS list command. PARTITION (partition_spec) Specifies the partition with parameters partition_spec whose location you want to change. I am passionate about Cloud, Data Analytics, Machine Learning, and Artificial Intelligence. Solution: ALTER TABLE PARTITION SET LOCATION does , To set the location for a single partition, include the PARTITION clause. 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. You do need to physically move the data on hdfs yourself. 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. 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. Here we will discuss how we can change table level properties. It does not change the locations associated with any tables/partitions under the specified database. jdbc:hive2://127.0.0.1:10000> ALTER TABLE zipcodes PARTITION(state='NC') SET LOCATION '/data/state=NC'; If you browse the location of the data directory for a non-partitioned table, it will look like this: .db/. Does this mean we can have our partitions at diffrent locations? The following queries rename the column name and column data type using the above data: Distinct Rows and Distinct Count from Spark Dataframe, Adding White Spaces to Data in Spark Dataframe. Hive Partitions is a way to organizes tables into partitions by dividing tables into different parts based on partition keys. Let us try to answer these questions in this blog post. Add partitions to the table, optionally with a custom location for each partition added. Internal tables Internal Table is tightly coupled in nature.In this type of table, first we have to create table and load the data. Your email address will not be published. Using Alluxio will typically require some change to the URI as well as a slight change to a path. 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. Q 6 - If we change the partition location of a hive table using ALTER TABLE option then the data for that partition in the table A - also moves automatically to the new location B - has to be dropped and recreated C - has to be backed up into a second table and restored D - has to be moved manually into new location Alter command will change the partition directory. Change ), You are commenting using your Google account. You can use Hive ALTER TABLE command to change the HDFS directory location or add new directory. The old table or partition directory is in a different encryption zone than the new warehouse directory. Drop a Hive partition. The partition_spec specifies a column name/value combination in the form partition_col_name = partition_col_value. 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 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. We can also rename existing partitions using below query. 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. 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. You can learn more about it here). Hive deals with two types of table structures like Internal and External tables depending on the loading and design of schema in Hive. And then point those old partitions to S3 location. 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 … Solved: I am using hdp 2.4.2 (hive - 1.2.1.2.4). alter table tstloc partition () set location ‘hdfs:///tmp/ttslocnew/’ 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). The partition statement lets Hive alter the way it manages the underlying structures of the table’s data directory. (C.C.P. ( Log Out / Getting distinct values from columns or rows is one of most used operations. I have started blogging about my experience while learning these exciting technologies. … 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). The court may order part of the property partitioned by sale and the remainder by physical division. 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'; … Change ), You are commenting using your Facebook account. The Exchange Partition feature is implemented as part of HIVE-4095. 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) The below example update the state=NC partition location from the default Hive store to a custom location /data/state=NC. Partition is helpful when the table has one or more Partition keys. Hive is metastore for tables. Hive doe not drop that data. Set partition location. 872.810, 872.820.). We can run below query to add partition to table. If nothing happens to be there, hive will not return anything. Is there a way to alter the table We will learn how to get distinct values as well as count of distinct values. The syntax of this command is as follows. Also, the location for a partition can be changed by below query, without moving or deleting the data from the old location. Change ), You are commenting using your Twitter account. Of course we can. 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). Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Partitioning is also one of the core strategies to improve query performance in a hive. Alter table statement is used to change the table structure or properties of an existing table in Hive. This was a short article, but quite useful. It just removes these details from table metadata. You can get the location of the Hive partitions on HDFS by running any of the following Hive commands. Without partitioning, any query on the table in Hive … When the command is executed, the source table's partition folder in HDFS will be … DESCRIBE FORMATTED db_name.table_name PARTITION (name = value) I hope you will find it useful. All the data files are directly written to this directory. ALTER TABLE log_messages PARTITION (year = 2019, month = 12) SET LOCATION '/maheshmogal.db/order_new/year=2019/month=12'; Exchanging multiple partitions is supported in Hive versions 1.2.2, 1.3.0, and 2.0.0+ as part of HIVE-11745. ALTER TABLE Transaction ADD PARTITION (Day=date '2019-11-22') LOCATION '/apps/bank/cust_transactions/00'; 1. With Alter table command, we can also update partition table location. Could reproduce it in my laptop using version 308 and prestodb/hdp2.6-hive:11 docker image. Create a free website or blog at WordPress.com. answered Feb 12, … MSCK REPAIR is a useful command and it had saved a lot of time for me. Here we are adding new information about partition to table metadata. MSCK REPAIR is a resource-intensive query and using it to add single partition is not recommended especially when you huge number of partitions. ALTER TABLE ADD PARTITION in Hive. 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. So your latest data will be in HDFS and old partitions in S3 and you can query that hive table seamlessly. It should just change the partition specification of the path. Using partitions, we can query the portion of the data. Let’s see a few variations of drop partition. Specifies the partition with parameters partition_spec whose location you want to change. 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. 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. If you also want to drop data along with partition fro external tables then you have to do it manually. I like to learn and try out new things. Lets check it with an example. Alter command will change the partition directory. You can use ALTER TABLE with DROP PARTITION option to drop a partition for a table. Alter command will change the partition directory. MSCK REPAIR is a useful command and it had saved a lot of time for me. Most ALTER TABLE operations do not actually rewrite, move, and so on the actual data files. (B) (B) Method to Reduce Clearing Time – A fuse shall have a clearing time of 0.07 seconds or less at the available arcing current, or one of the following shall be provided (1) differential relaying However, beginning with Spark 2.1, Alter Table Partitions is also supported for tables defined using the datasource API. It should just change the partition specification of the path. Now, what if we want to drop some partition or add a new partition to the table? Your email address will not be published. This is supported only for tables created using the Hive format. Drop or Delete Hive Partition. Updating & Renaming Partitions in Hive Tables With Alter table command, we can also update partition table location. Dynamic Partitioning in Hive. MSCK REPAIR is a resource-intensive query and using it to add single partition is not recommended especially when you huge number of partitions. In Impala, this is primarily a logical operation that updates the table metadata in the metastore database that Impala shares with Hive. 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. Hive Facts Conclusion. The old table or partition directory is in a different encryption zone than the new warehouse directory. on hive terminal run below command. However, with the help of CLUSTERED BY clause and optional SORTED BY clause in CREATE TABLE statement we can create bucketed 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: alter table FpML_Data set location hdfs:/file_path_in_HDFS; HDFS: is value against fs.defaultFS property in core-site.xml . Solution: ALTER TABLE PARTITION SET LOCATION does , To set the location for a single partition, include the PARTITION clause. Note that there is no impact on the data that resides in the table. Not just in different locations but also in different file systems. ALTER TABLE table_name PARTITION partition_spec RENAME TO PARTITION partition… 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. 2. Using Alluxio will typically require some change to the URI as well as a slight change to a path. The following table contains the fields of employeetable and it shows the fields to be changed (in bold). Drop a single partition Setting the location of individual partitions is allowed only for tables created using the Hive format. Long story short: the location of a hive managed table is just metadata, if you update it hive will not find its data anymore. 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. ( Log Out / Partitioning is one of the important topics in the Hive. We have created partitioned tables, inserted data into them. 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… 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. This will delete the partition from the table. 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. 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. Sorry, your blog cannot share posts by email. In the last few articles, we have covered most of the details of Partitioning in Hive. Post was not sent - check your email addresses! Also, it happens with both managed and external table. In this blog, we will learn how to filter rows from spark dataframe using Where and Filter functions. 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. 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. It simply sets the Hive table partition to the new location. Exactly, partition with webhdfs throws Partition location does not exist even if it exists. Can we have one partition at different locations? We are telling hive this partition for this table is has its data at this location. ALTER Statement on HIVE Table. to design, install, operate, or inspect the installation as to the location of the fuses. 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'. Hey, Basically When we create a table in hive, it creates in the default location of the hive warehouse. Change ). 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. Each partition of a table is associated with a particular value(s) of partition column(s). Get latest blogs delivered to your mail directly. Next, we will start learning about bucketing an equally important aspect in Hive with its unique features and use cases. The following query is used to add a partition to the employee table. Here is the alter command to update the partition of the table sales. hive> ALTER TABLE employee > ADD PARTITION (year=’2012’) > location '/2012/part2012'; Renaming a Partition. hdfs dfs -ls
/ SET LOCATION 'new location' Specifies the new location, which must be … ALTER TABLE some_table DROP IF EXISTS PARTITION(year = 2012); This command will remove the data and metadata for this partition. Change location in the table properties using the following query. But what about data when you have an external hive table? Hope to see you there. The ALTER DATABASE... SET LOCATION statement does not move the contents of the database's current directory to the newly specified location. 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… SQL. In this blog, we will learn how to sort rows in spark dataframe based on some column values. hive> ALTER TABLE sales PARTITION(year = 2020, quarter = 2) SET LOCATION 'hdfs://user/svc_account/fixed_date/2020/2'; Drop a Hive partition. 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). ALTER SCHEMA was added in Hive 0.14 (HIVE-6601). When I tried using the following hive command it gives me error. ALTER TABLE table_name SET LOCATION "location_in_hdfs" (e.g "hdfs://bighdpope/data/raw/cag/Output") 2.) In addition, we can use the Alter table add partition command to add the new partitions for a table. Let’s see a few variations of drop partition. From Hive v0.8.0 onwards, multiple partitions can be added in the same query. The ALTER TABLE statement changes the structure or properties of an existing Impala table.. You also need to relocate every partition to point at the new folder structure, i.e. We can also drop partition from hive tables. For example, below command will ALTER TABLE some_table PARTITION (year = 2012) SET LOCATION 'hdfs://user/user1/some_table/2012'; You can use the Hive ALTER TABLE command to change the HDFS directory location of a specific partition. In that case, you can set up a job that will move old data to S3 ( It is Amazons cheap store service. ( Log Out / Copy the file from old_location to new_location using the File Browser. Required fields are marked *. 2. ( Log Out / 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. Partition keys are basic elements for determining how the data is stored in the table. Consider use case, you have a huge amount of data but you do not use old data that frequently (something like log data). Hive Facts Conclusion.