Because it depends on the table’s properties when it was created: It requires altering the hive table’s properties and setting External the property to false . Reply 4,234 Views Syntax: DROP TABLE [IF EXISTS] table … When I have a table at my sqoop schema and want to delete it, I go to HIVE editor (through HUE) and key in the following command DROP TABLE IF EXISTS schemaName.tblName PURGE; After that the table disappeared form the gui of HUE (sqoop table list, metastore list) but the actual files of the table were not deleted from the HDFS. Instead, metastore will delete the data. Here is a common approach to delete a hive table: Presto is not responsible for deleting the data. Unless Impersonation accessing the Hive metastore is enabled, the principal specified by hive.metastore.client.principal must have sufficient privileges to remove files and directories within the hive/warehouse directory. When you will drop/delete the table form the hive database, the table entry will delete it from hive metastore. The other option is to manually delete the HDFS directory (recursive remove) of the offending table followed by a drop table if exists . The table is removed from Hive Metastore and the data stored externally. When you drop a table from Hive Metastore, it removes the table/column data and their metadata. I’m not sure why this is the case. 2.1 Configurables. One of the challenges we meet is the data volume. Verify code signature of a package installer, How to code arrows that go from one line to another, How do a transform simple object to have a concave shape, Meaning of "τρίχας" in Anacreon's Περι Γέροντος. Here we can drop or delete the table form the system. If it is an internal table then the table and data will complete delete. I tried it myself and the table was dropped without issue. Columns PART_ID , CREATE_TIME , LAST_ACCESS_TIME , PART_NAME , SD_ID , TBL_ID, LINK_TARGET_ID; Steps to Get All Hive metastore information which is required for Manual Hive metadata migration. Do you have steps to replicate this? I am writing this blog for, "How to Insert, Update and Delete records into a Hive table?" alter table mytable set location 'hdfs://valid/path'; drop table mytable; Here is an example To make our data ingestion more scalable and to separate concerns, we have built a generalized … rev 2021.3.12.38768, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. Internal tables. statement fails because of foreign key violation (full stacktrace will be added): Caused by: java.sql.BatchUpdateException: Cannot delete or update a parent row: a foreign key constraint fails ("hivemetastore_emtig3vtq7qp1tiooo07sb70ud". DROP table command removes the metadata and data for a particular table. Hive is very much capable such that it can query petabytes of records stored inside the hive table. But there is a catch. If it is an external table then the table entry will delete it from metastore but the data is … In your case, metastore somehow decided that it’s going to leave the top-level directory alone. Amobee is a leading independent advertising platform that unifies all advertising channels — including TV, programmatic and social. If it is an internal table then the table and data will complete delete. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. MERGE is like MySQL’s INSERT ON UPDATE. Metastore log file shows that "DELETE FROM `PARTITION_KEYS` WHERE `TBL_ID`=?" It can update target table with a source table. Former PI lists a non-contributor as first author on a manuscript for which I did all the work. hive.metastore.event.listeners = … PARTITIONS Table – Accessed Jointly with DBS and TBLS Tables. DROP TABLE command in the hive is used to drop a table inside the hive. DROP TABLE removes metadata and data for this table. Hive will remove all of its data and metadata from the hive meta-store. Hive is very much capable such that it can query petabytes of records stored inside the hive table. This chapter describes how to drop a table in Hive. How does the strong force increase in attraction as particles move farther away? You can make use of these keywords as a workaround to delete records from Hive tables. When you will drop/delete the table form the hive database, the table entry will delete it from hive metastore. Here is a common approach to delete a hive table: This approach deletes the table from Hive Metastore but not the data itself. Each table can vary from TB to PB. When a table is created in the Hive metastore, the Hive connector checks whether the schema that contains the table is listed in this property. The INSERT command in Hive loads the data into a Hive table. Hive LEFT JOIN as Workaround to Delete Records from Hive Table Using Hive LEFT JOIN is one of the widely used work round to delete records from Hive tables. Let us re-write previous SQL delete statement using NOT EXISTS. Why does every "defi" thing only support garbagecoins and never Bitcoin? Data is usually moved to .Trash/Current directory if Trash is configured. Cause. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. DROP TABLE command in the hive is used to drop a table inside the hive. This developer built a…, deleting null or __HIVE_DEFAULT_PARTITION__ in from hive external table and also from HDFS directory, Total number of replicated files after copying hdfs file into hive table. snowflake.hive-metastore-listener.schemas. We need to get list of all Databases so that you can create them in a new cluster. Using %sql or spark.sql to drop table doesn’t work either. Can you show the output? If you are deleting a hive table using Spark, it is very much possible that the table gets deleted but the data in the format of files is still there. Drop or Delete Hive Partition. When you drop a table from Hive Metastore, it removes the table/column data and their metadata. Specifies a comma-separated list of existing Snowflake schemas in the database specified in snowflake.jdbc.db. Starting from Spark 1.4.0, a single binary build of Spark SQL can be used to query different versions of Hive metastores, using the … set @table_name = ' '; SELECT @tbl_id : = TBl_ID FROM TBLS WHERE TBL_NAME = @table_name;--Delete partition key vals: DELETE pvk: FROM PARTITION_KEY_VALS pvk: JOIN PARTITIONS p: ON p. PART_ID = pvk. ALTER TABLE poc_drop_partition SET TBLPROPERTIES ('EXTERNAL'='FALSE') ; ALTER TABLE poc_drop_partition DROP IF EXISTS … Drop a table form the hive metastore. The hive DROP TABLE … Option 1: Drop the table/ partition & remove corresponding files in HDFS/ Azure Blob storage if using HDInsight. Since the metadata is corrupted for the table Spark can’t drop the table and fails with following exception. Delete table level column statistics given dbName, tableName and colName. Above command synchronize zipcodes table on Hive Metastore. When you run Drop table command, Spark checks whether table exists or not before dropping the table. There is a table for which the backing hdfs file no longer exists. Hive LEFT JOIN will return all the records in the left table that do not match any records in the right table. If you want the DROP TABLE command to also remove the actual data in the external table, as DROP TABLE does on a managed table, you need to configure the table properties accordingly. Use DROP TABLE to drop a table, like any other RDBMS, dropping a table in hive drops the table description from Hive Metastore and it’s data from the Hive warehouse store(For internal tables). I ran into this issue in only one of hundreds of tables being dropped/recreated. DROP TABLE names_text; The table is removed from Hive Metastore and the data stored externally. The Platform Data Team is building a data lake that can help customers extract insights from data easily. DROP Table Command in Hive. For Hive connector, when you request that Presto drop a table, Presto simply tells Hive metastore to drop the table. The data source can be first-party/third-party. Why couldn't Foaly tell that Artemis had planned more than what he let on under the effect of the Mesmer while he was editing Artemis's memories? In this blog I will explain how to configure the hive to perform the ACID operation. Now the problem is that the "drop table" command fails: You can change the location to something valid and then delete it. If you are deleting a hive table using Spark, it is very much possible that the table gets deleted but the data in the format of files is still there. @JeremyBeard No. Functionalities. The hive DROP TABLE statement comes with a PURGE option. For instance: This statement will update the salary of Tom, and insert a new row of Mary. However, currently it only supports addition of missing partitions. Apache hive 0.14 and higher is supporting ACID operation into a hive transaction tables. Transactional Tables: Hive supports single-table transactions. Dropping an External … The data is actually moved to the .Trash/Current directory if Trash is configured (and PURGE is not specified). Who started the "-oid" suffix fashion in math? For versions below Hive 2.0, add the metastore tables with the following configurations in your existing init script: drop the partition and change back to table property external as below. How to delete table entry from hive metastore when underlying hdfs file disappeared, State of the Stack: a new quarterly update on community and product, Podcast 320: Covid vaccine websites are frustrating. The INSERT clause generates delta_0000002_0000002_0000, containing the row … When running hdfs -dfs the file in question does in fact NOT exist. Drop Internal or External Table. Spark(2.4) will throw following exception running this query: Solution to this problem is to run the ALTER query with hive-jdbc. No rows selected when trying to load csv file in hdfs to a hive table, How to drop a database from hive metastore when underlying HDFS cluster in no longer there, Translation of lucis mortiat / reginae gloriae. In Hive terminology, external tables are tables not managed with Hive. What's the map on Sheldon & Leonard's refrigerator of? BACKUP THE DB BEFORE PROCEEDING! If it is an external table then the table entry will delete it from metastore but the data is available on HDFS Level. The metadata (table schema) stored in the metastore is corrupted. PART_ID: WHERE p. TBL_ID = @tbl_id;--Delete partition params: DELETE … When you run Drop table command, Spark checks whether table exists or not before dropping the table. SQL Delete Query: DELETE FROM pat_dtls_load WHERE sk IN (SELECT sk FROM new_pat_dtls_load WHERE NAME = 'Stuart') ; Hive Equivalent Delete statement … If you are deleting a hive table using Spark, it is very much possible that the table gets deleted but the data in the format of files is still there. Warning. If the external metastore version is Hive 2.0 or above, use the Hive Schema Tool to create the metastore tables. Their purpose is to facilitate importing of data from an external file into the metastore. 2.1.1 New Ranger Configurables. DROP TABLE [IF EXISTS] table_name [PURGE]; Usage of DROP Table command in Hive . Why? Tables must… It can be a normal table (stored in Metastore) or an external table (stored in local file system); Hive treats both in the same manner, irrespective of their types. Now run the show partition command which shows state=AL partition. Using %sql or spark.sql to drop table doesn’t work either. We are going to add support for defining tables and all the associated DDL commands (CREATE, ALTER, DROP, etc.) When you run Drop table command, Spark checks whether table exists or not before dropping the table. So, the information schema is irrelevant to hive; to get the hive table details, you have to interrogate the TBLS table, for example. The hive schema holds the hive tables though. It can be a normal table or an external table; Hive treats both in the same manner, irrespective of their types. Hive will remove all of its data and metadata from the hive meta-store. The metadata (table schema) stored in the metastore is corrupted. The metadata is completely lost. Internal Table is tightly coupled in nature.In this type of table, first we have to create table and load the data.