As a part of maintenance, you should identify the size of growing tables periodically. I am looking for a approach to run a command and get all required info. % scala spark.read.table ("< non-delta-table-name >") .queryExecution.analyzed.stats Was this article helpful? format(serde, input format, output format), e.g. 10:59 PM, Created This video talks about storing the output of hive query in file. Create a database named "company" by running the create command: create database company; The terminal prints a confirmation message and the time needed to perform the action. SAP is the largest non-American software company by revenue, the . 09:33 AM, CREATE TABLE `test.test`()ROW FORMAT SERDE'org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe'STORED AS INPUTFORMAT'org.apache.hadoop.hive.ql.io.parquet.MapredParquetInputFormat'OUTPUTFORMAT'org.apache.hadoop.hive.ql.io.parquet.MapredParquetOutputFormat'LOCATION'hdfs://usasprd1/data/warehouse/test.db/test'TBLPROPERTIES ('COLUMN_STATS_ACCURATE'='true','last_modified_by'='hive','last_modified_time'='1530552484','numFiles'='54','numRows'='134841748','rawDataSize'='4449777684','totalSize'='11998371425','transient_lastDdlTime'='1531324826'). Version of the Hive metastore. number of rows) without launching a time-consuming MapReduce job? For example, # +---+-------+ Hive Partitioning vs Bucketing with Examples? # Key: 0, Value: val_0 The totalSize returned in Hive is only the actual size of the table itself, which is only 1 copy, so 11998371425 * 3 = 35995114275 = 33GB. There are indeed other ways. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Google says; Snappy is intended to be fast. Provides High compression ratio (even higher than GZIP). # PySpark Usage Guide for Pandas with Apache Arrow, Specifying storage format for Hive tables, Interacting with Different Versions of Hive Metastore. Connect and share knowledge within a single location that is structured and easy to search. Hive Partition is a way to organize large tables into smaller logical tables . Partition logdata.ops_bc_log{day=20140523} stats: [numFiles=37, This command shows meta data about the hive table which includes list of columns,data types and location of the table.There are three ways to describe a table in Hive. The default for hive.auto.convert.join.noconditionaltask is false which means auto conversion is disabled.. This cookie is set by GDPR Cookie Consent plugin. This I ran the suggested command but i see size as 0 whereas i know it has some data. Also, this only works for non-partitioned tables which have had stats run on them. We also use third-party cookies that help us analyze and understand how you use this website. SELECT SUM(PARAM_VALUE) FROM TABLE_PARAMS WHERE PARAM_KEY=totalSize; Get the table ID of the Hive table forms the TBLS table and run the following query: SELECT TBL_ID FROM TBLS WHERE TBL_NAME=test; SELECT * FROM TABLE_PARAMS WHERE TBL_ID=5109; GZIP. In a managed table, both the table data and the table schema are managed by Hive. The below steps when when performed in the Hive Metastore DB would help you in getting the total size occupied by all the tables in Hive. # |238|val_238| spark-warehouse in the current directory that the Spark application is started. 01-13-2017 hive.mapjoin.localtask.max.memory.usage. The next point which is the hdfs du -s can be compared to check this. As user bigsql: 3 Describe formatted table_name: 3.1 Syntax: 3.2 Example: We can see the Hive tables structures using the Describe commands. By default the replica is 3. How do I align things in the following tabular environment? P.S: previous approach is applicable for one table. 01-13-2017 numRows=26295075, totalSize=657113440, rawDataSize=58496087068], solution, though not quick Insert into bucketed table produces empty table. You also need to define how this table should deserialize the data to rows, or serialize rows to data, i.e. You can check for tables with this value as false to see if there are any tables in Hive those might have missing statistics. Clouderas new Model Registry is available in Tech Preview to connect development and operations workflows, [ANNOUNCE] CDP Private Cloud Base 7.1.7 Service Pack 2 Released, [ANNOUNCE] CDP Private Cloud Data Services 1.5.0 Released. 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It does not store any personal data. compression=SNAPPY in the Custom hive-site settings section in Ambari for either IOP or HDP which will ensure that Hive always compresses any Parquet file it produces. hive> describe extended bee_master_20170113_010001> ;OKentity_id stringaccount_id stringbill_cycle stringentity_type stringcol1 stringcol2 stringcol3 stringcol4 stringcol5 stringcol6 stringcol7 stringcol8 stringcol9 stringcol10 stringcol11 stringcol12 string, Detailed Table Information Table(tableName:bee_master_20170113_010001, dbName:default, owner:sagarpa, createTime:1484297904, lastAccessTime:0, retention:0, sd:StorageDescriptor(cols:[FieldSchema(name:entity_id, type:string, comment:null), FieldSchema(name:account_id, type:string, comment:null), FieldSchema(name:bill_cycle, type:string, comment:null), FieldSchema(name:entity_type, type:string, comment:null), FieldSchema(name:col1, type:string, comment:null), FieldSchema(name:col2, type:string, comment:null), FieldSchema(name:col3, type:string, comment:null), FieldSchema(name:col4, type:string, comment:null), FieldSchema(name:col5, type:string, comment:null), FieldSchema(name:col6, type:string, comment:null), FieldSchema(name:col7, type:string, comment:null), FieldSchema(name:col8, type:string, comment:null), FieldSchema(name:col9, type:string, comment:null), FieldSchema(name:col10, type:string, comment:null), FieldSchema(name:col11, type:string, comment:null), FieldSchema(name:col12, type:string, comment:null)], location:hdfs://cmilcb521.amdocs.com:8020/user/insighte/bee_data/bee_run_20170113_010001, inputFormat:org.apache.hadoop.mapred.TextInputFormat, outputFormat:org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat, compressed:false, numBuckets:-1, serdeInfo:SerDeInfo(name:null, serializationLib:org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, parameters:{field.delim= , serialization.format=Time taken: 0.328 seconds, Fetched: 18 row(s)hive> describe formatted bee_master_20170113_010001> ;OK# col_name data_type comment, entity_id stringaccount_id stringbill_cycle stringentity_type stringcol1 stringcol2 stringcol3 stringcol4 stringcol5 stringcol6 stringcol7 stringcol8 stringcol9 stringcol10 stringcol11 stringcol12 string, # Detailed Table InformationDatabase: defaultOwner: sagarpaCreateTime: Fri Jan 13 02:58:24 CST 2017LastAccessTime: UNKNOWNProtect Mode: NoneRetention: 0Location: hdfs://cmilcb521.amdocs.com:8020/user/insighte/bee_data/bee_run_20170113_010001Table Type: EXTERNAL_TABLETable Parameters:COLUMN_STATS_ACCURATE falseEXTERNAL TRUEnumFiles 0numRows -1rawDataSize -1totalSize 0transient_lastDdlTime 1484297904, # Storage InformationSerDe Library: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDeInputFormat: org.apache.hadoop.mapred.TextInputFormatOutputFormat: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormatCompressed: NoNum Buckets: -1Bucket Columns: []Sort Columns: []Storage Desc Params:field.delim \tserialization.format \tTime taken: 0.081 seconds, Fetched: 48 row(s)hive> describe formatted bee_ppv;OK# col_name data_type comment, entity_id stringaccount_id stringbill_cycle stringref_event stringamount doubleppv_category stringppv_order_status stringppv_order_date timestamp, # Detailed Table InformationDatabase: defaultOwner: sagarpaCreateTime: Thu Dec 22 12:56:34 CST 2016LastAccessTime: UNKNOWNProtect Mode: NoneRetention: 0Location: hdfs://cmilcb521.amdocs.com:8020/user/insighte/bee_data/tables/bee_ppvTable Type: EXTERNAL_TABLETable Parameters:COLUMN_STATS_ACCURATE trueEXTERNAL TRUEnumFiles 0numRows 0rawDataSize 0totalSize 0transient_lastDdlTime 1484340138, # Storage InformationSerDe Library: org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDeInputFormat: org.apache.hadoop.hive.ql.io.parquet.MapredParquetInputFormatOutputFormat: org.apache.hadoop.hive.ql.io.parquet.MapredParquetOutputFormatCompressed: NoNum Buckets: -1Bucket Columns: []Sort Columns: []Storage Desc Params:field.delim \tserialization.format \tTime taken: 0.072 seconds, Fetched: 40 row(s), Created 01-17-2017 Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin?). (HIVE-19334) Use actual file size . Everest at The Hive | SCAD.edu Hive supports ANSI SQL and atomic, consistent, isolated, and durable (ACID) transactions. The data will be located in a folder named after the table within the Hive data warehouse, which is essentially just a file location in HDFS. You can determine the size of a non-delta table by calculating the total sum of the individual files within the underlying directory. What happened when a managed table is dropped? b. This cookie is set by GDPR Cookie Consent plugin. 07-05-2018 I have many tables in Hive and suspect size of these tables are causing space issues on HDFS FS. Metastore is the central repository of Apache Hive metadata. (Which is why I want to avoid COUNT(*).). ; external table and internal table. Hive: how to show all partitions of a table? [jira] [Updated] (HIVE-19334) Use actual file size rather than stats I have many tables in Hive and suspect size of these tables are causing space issues on cluster. Solved: Can we check size of Hive tables? If so - Cloudera 06:25 AM, When i run du command it give me below size of table, 33.1 GB hdfs dfs -du -s -h /data/warehouse/test.db/test, ANALYZE TABLECOMPUTE STATISTICS FOR COLUMNS, Created numPartitions: # +---+-------+ # | 500 | Hands on experience on SQL SERVER 2016, 2014, SSIS, SSRS, SSAS (Data Warehouse, DataMart, Dimensional Modelling, Cube Designing and deployment), Power BI, MSBI and SYBASE 12.5. AC Op-amp integrator with DC Gain Control in LTspice. You can alternatively set parquet. Provides High compression ratio. Not the answer you're looking for? 5 What happened when a managed table is dropped? Steps to Read Hive Table into PySpark DataFrame Step 1 - Import PySpark Step 2 - Create SparkSession with Hive enabled Step 3 - Read Hive table into Spark DataFrame using spark.sql () Step 4 - Read using spark.read.table () Step 5 - Connect to remove Hive. The size of real data files is matched11998371425. If so - how? By default hive1 database Hive Metastore DB, execute the following query to get the total size of all the tables in Hive in bytes for one replica, multiply it by replication factor. HOW TO: Find Total Size of Hive Database/Tables in BDM? prefix that typically would be shared (i.e. What happens when a managed table is dropped in hive? be shared is JDBC drivers that are needed to talk to the metastore. Is there a solution to add special characters from software and how to do it. This cookie is set by GDPR Cookie Consent plugin. # | 4| val_4| 4| val_4| HOW TO: Find Total Size of Hive Database/Tables in BDM? - Informatica You also have the option to opt-out of these cookies. How do you know if a hive table is internal or external? Hive simplifies the performance of operations such as: Data encapsulation Ad-hoc queries Analysis of huge datasets But what makes Hive standout? This article shows how to import a Hive table from cloud storage into Databricks using an external table. Can we check size of Hive tables? If so, how? - Stack Overflow For external tables Hive assumes that it does not manage the data. Does a summoned creature play immediately after being summoned by a ready action? Both Partitioning and Bucketing in Hive are used to improve performance by eliminating table scans when dealing with a large set of data on a Hadoop file system (HDFS). Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. The company is the world's leading enterprise resource planning (ERP) software vendor. Use hdfs dfs -du Command (40) (140) Why does Mister Mxyzptlk need to have a weakness in the comics? The Mail Archive home; issues - all . Step 1: Create a Database 1. C $35.26. How do you write a good story in Smash Bros screening? The files are appended in the directory. To get the size of your test table (replace database_name and table_name by real values) just use something like (check the value of hive.metastore.warehouse.dir for /apps/hive/warehouse): [ hdfs @ server01 ~] $ hdfs dfs -du -s -h / apps / hive / warehouse / database_name / table_name "After the incident", I started to be more careful not to trip over things. Each room features air conditioning, an extra-long, twin-size bed, a desk, a chair, a wardrobe with drawers . 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. Hive table | Databricks on AWS Relax, unwind and create the perfect space with the Domi round coffee table, richly crafted from sustainable Mango wood and Rattan. Difference between Hive internal tables and external tables? it is tedious to run the same command for each table. The major difference between Partitioning vs Bucketing lives in the way how they split the data. 01-17-2017 Available Find centralized, trusted content and collaborate around the technologies you use most. Hadoop Hive - Join Optimization Switch to the HBase schema and issue the SHOW TABLES command to see the HBase tables that exist within the schema. How do I tell hive about file formats in HDFS? Hive temporary tables are similar to temporary tables that exist in SQL Server or any RDBMS databases, As the name suggests these tables are created temporarily within an active session. For text-based files, use the keywords STORED as TEXTFILE. Provide Name of the linked service. it is tedious to run the same command for each table. When you create a Hive table, you need to define how this table should read/write data from/to file system, How to Create a Table in Hive - Knowledge Base By PhoenixNAP To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 05:38 PM, Created rev2023.3.3.43278. If Hive dependencies can be found on the classpath, Spark will load them 12:00 AM, Created Find answers, ask questions, and share your expertise, Hive explain Table Parameters: totalSize doesn't match actual file size. Why doesnt hive keep stats on the external table? I was wondering if there is a way to enforce compression on table itself so that even if the above two properties are not set the data is always compressed? It would seem that if you include the partition it will give you a raw data size. This cookie is set by GDPR Cookie Consent plugin. When not configured // Partitioned column `key` will be moved to the end of the schema. hive> select length (col1) from bigsql.test_table; OK 6 Cause This is expected behavior. The four most widely used Compression formats in Hadoop are as follows: The principle being that file sizes will be larger when compared with gzip or bzip2. the count() will take much time for finding the result. Choose Azure SQL Database, click Continue.. Here are the types of tables in Apache Hive: Managed Tables. # | 5| val_5| 5| val_5| When the. So far we have been inserting data into the table by setting the following properties hive> set hive.exec.compress.output=true; hive> set avro.output.codec=snappy; However, if someone forgets to set the above two properties the compression is not achieved. But it is useful for one table. # +--------+ Jason Dere (JIRA) Reply via email to Search the site. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Managed or external tables can be identified using the DESCRIBE FORMATTED table_name command, which will display either MANAGED_TABLE or EXTERNAL_TABLE depending on table type. The following options can be used to specify the storage