Login into Hive Metastore DB and use the database that is used by hive. // You can also use DataFrames to create temporary views within a SparkSession. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? # Key: 0, Value: val_0 "After the incident", I started to be more careful not to trip over things. 1. find out the path of the hive tables: for example, find the path for table r_scan1, Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. # | 500 | There are indeed other ways. Recovering from a blunder I made while emailing a professor, How to handle a hobby that makes income in US. Hive query to quickly find table size (number of rows), How Intuit democratizes AI development across teams through reusability. Yes the output is bytes. Hive is a very important component or service in the Hadoop stack. C $35.26. Use parquet format to store data of your external/internal table. When the. Compressed file size should not be larger than a few hundred megabytes. Answer. options are. P.S: previous approach is applicable for one table. Note that After 3 replicas it is 99.4GB. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Hive "ANALYZE TABLE" how to execute from java. 324 and 972 are the sizes of one and three replicas of the table data in HDFS. "output format". The cookie is used to store the user consent for the cookies in the category "Performance". The Mail Archive home; issues - all . org.apache.spark.*). The query takes the sum of total size of all the Hive tables based on the statistics of the tables. Why did Ukraine abstain from the UNHRC vote on China? # | 4| val_4| 4| val_4| Thanks very much for all your help, Created Jason Dere (JIRA) . # | 5| val_5| 5| val_5| The following options can be used to configure the version of Hive that is used to retrieve metadata: A comma-separated list of class prefixes that should be loaded using the classloader that is "SELECT key, value FROM src WHERE key < 10 ORDER BY key". You may need to grant write privilege to the user who starts the Spark application. # +---+------+---+------+ You can determine the size of a non-delta table by calculating the total sum of the individual files within the underlying directory. Spark SQL also supports reading and writing data stored in Apache Hive. If so, how? You can check for tables with this value as false to see if there are any tables in Hive those might have missing statistics. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. - the incident has nothing to do with me; can I use this this way? [jira] [Updated] (HIVE-19334) Use actual file size rather than stats for fetch task optimization with external tables. Jason Dere (JIRA) . Here are the types of tables in Apache Hive: Managed Tables. Big tables can cause the performance issue in the Hive.Below are some of methods that you can use to list Hive high volume tables. 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'). How do you enable compression on a hive table? Why keep stats if we can't trust that the data will be the same in another 5 minutes? Hudi supports two storage types that define how data is written, indexed, and read from S3: 07-11-2018 This website uses cookies to improve your experience while you navigate through the website. Why does Mister Mxyzptlk need to have a weakness in the comics? So what does that mean? 3 Describe formatted table_name: 3.1 Syntax: 3.2 Example: We can see the Hive tables structures using the Describe commands. Created 1. 01-17-2017 07-11-2018 Types of Tables in Apache Hive. Prerequisites The Hive and HDFS components are running properly. Hive Partition is a way to organize large tables into smaller logical tables . The benchmark compares all the SQL systems embedded with HDP3 as well as Hive on MR3 (a new execution engine for Hadoop and Kubernetes), by running a set of 99 SQL queries. Apparently the given command only works when these properties are available to the column, which is not there by default. You can use the hdfs dfs -du /path/to/table command or hdfs dfs -count -q -v -h /path/to/table to get the size of an HDFS path (or table). 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. 01-17-2017 Available in extra large sizes, a modern twist on our popular Hive 5 What happened when a managed table is dropped? Hive supports tables up to 300PB in Optimized Row Columnar (ORC) format. # |311|val_311| If so - how? and its dependencies, including the correct version of Hadoop. Not the answer you're looking for? It will able to handle a huge amount of data i.e. I have many tables in Hive and suspect size of these tables are causing space issues on HDFS FS. For text-based files, use the keywords STORED as TEXTFILE. How do I tell hive about file formats in HDFS? 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. What is Hive? This is a Summary of Kate Hudson's NY Times Bestseller 'Pretty Happy'. It would seem that if you include the partition it will give you a raw data size. hdfs dfs -du command returns the TOTAL size in HDFS, including all replicas. You can also use queryExecution.analyzed.stats to return the size. Also, this only works for non-partitioned tables which have had stats run on them. hdfs dfs -df -s -h . It does not store any personal data. 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 connectivity to a persistent Hive metastore, support for Hive serdes, and Hive user-defined functions. -- gives all properties show tblproperties yourTableName -- show just the raw data size show tblproperties yourTableName ("rawDataSize") Share Improve this answer Follow answered Mar 21, 2016 at 13:00 Jared 2,894 5 33 37 3 Partitioning Tables: Hive partitioning is an effective method to improve the query performance on larger tables. Note that, Hive storage handler is not supported yet when 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. this return nothing in hive. HIVE-19334.4.patch > Use actual file size rather than stats for fetch task optimization with > external tables . 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. 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. By clicking Accept All, you consent to the use of ALL the cookies. hive> show tables;OKbee_actionsbee_billsbee_chargesbee_cpc_notifsbee_customersbee_interactionsbee_master_03jun2016_to_17oct2016bee_master_18may2016_to_02jun2016bee_master_18oct2016_to_21dec2016bee_master_20160614_021501bee_master_20160615_010001bee_master_20160616_010001bee_master_20160617_010001bee_master_20160618_010001bee_master_20160619_010001bee_master_20160620_010001bee_master_20160621_010002bee_master_20160622_010001bee_master_20160623_010001bee_master_20160624_065545bee_master_20160625_010001bee_master_20160626_010001bee_master_20160627_010001bee_master_20160628_010001bee_master_20160629_010001bee_master_20160630_010001bee_master_20160701_010001bee_master_20160702_010001bee_master_20160703_010001bee_master_20160704_010001bee_master_20160705_010001bee_master_20160706_010001bee_master_20160707_010001bee_master_20160707_040048bee_master_20160708_010001bee_master_20160709_010001bee_master_20160710_010001bee_master_20160711_010001bee_master_20160712_010001bee_master_20160713_010001bee_master_20160714_010001bee_master_20160715_010002bee_master_20160716_010001bee_master_20160717_010001bee_master_20160718_010001bee_master_20160720_010001bee_master_20160721_010001bee_master_20160723_010002bee_master_20160724_010001bee_master_20160725_010001bee_master_20160726_010001bee_master_20160727_010002bee_master_20160728_010001bee_master_20160729_010001bee_master_20160730_010001bee_master_20160731_010001bee_master_20160801_010001bee_master_20160802_010001bee_master_20160803_010001, Created Insert into bucketed table produces empty table. Hive is an ETL and Data warehousing tool developed on top of the Hadoop Distributed File System. 07-11-2018 When working with Hive, one must instantiate SparkSession with Hive support, including If so, how close was it? [jira] [Updated] (HIVE-19334) Use actual file size rather than stats for fetch task optimization with external tables. But when there are many databases or tables (especially external tables) with data present in multiple different directories in HDFS, the below might help in determining the size. default Spark distribution. I have many tables in Hive and suspect size of these tables are causing space issues on cluster. Is it possible to create a concave light? BZIP2. Since this is an external table (EXTERNAL_TABLE), Hive will not keep any stats on the table since it is assumed that another application is changing the underlying data at will. 12:25 PM This article shows how to import a Hive table from cloud storage into Databricks using an external table. Below are the sample results when testing using hive shell as "hive" and "bigsql". Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. the input format and output format. 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 Full text of the 'Sri Mahalakshmi Dhyanam & Stotram', Relation between transaction data and transaction id. Step 1: Create a Database 1. I tried Googling and searching the apache.org documentation without success.). A service that provides metastore access to other Apache Hive services. Is there a Hive query to quickly find table size (i.e. By default, S3 Select is disabled when you run queries. hive> select length (col1) from bigsql.test_table; OK 6 Cause This is expected behavior. Otherwise, only numFiles / totalSize can be gathered. Hive explain Table Parameters: totalSize doesn't m Open Sourcing Clouderas ML Runtimes - why it matters to customers? Table name: Create Spark Session with Hive Enabled Yeah, you are correct. numRows=26095186, totalSize=654249957, rawDataSize=58080809507], Partition logdata.ops_bc_log{day=20140521} stats: [numFiles=30, I recall something like that. [This can be checked in the table TABLE_PARAMS in Metastore DB that I have also mentioned below (How it works?.b)]. "After the incident", I started to be more careful not to trip over things. When not configured 05:38 PM, Created Default Value: 0.90; Added In: Hive 0.7.0 with HIVE-1808 and HIVE-1642 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. Step 1: Start all your Hadoop Daemon start-dfs.sh # this will start namenode, datanode and secondary namenode start-yarn.sh # this will start node manager and resource manager jps # To check running daemons Step 2: Launch hive from terminal hive Creating Table in Hive Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? repopulate so size is different but still not match11998371425. hdfs dfs -du -s -h /data/warehouse/test.db/test/22.5 G 67.4 G /data/warehouse/test.db/test. I tried this and it says 12.8 G does it stand for 12.8 GB? automatically. 2. Use hdfs dfs -du Command will compile against built-in Hive and use those classes for internal execution (serdes, UDFs, UDAFs, etc). Login into Hive Metastore DB and use the database that is used by hive. Using hive.auto.convert.join.noconditionaltask, you can combine three or more map-side joins into a (This rule is defined by hive.auto.convert.join.noconditionaltask.size.) 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. The following options can be used to specify the storage Reply 9,098 Views 0 Kudos ranan Contributor Created 07-06-2018 09:28 AM Thank you for your reply Eric Du return 2 number. When an external table is dropped in Hive? However I ran the hdfs command and got two sizes back. How to notate a grace note at the start of a bar with lilypond? Whats the grammar of "For those whose stories they are"? shared between Spark SQL and a specific version of Hive. Google says; Snappy is intended to be fast. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. HOW TO: Find Total Size of Hive Database/Tables in BDM? Why are physically impossible and logically impossible concepts considered separate in terms of probability? Find centralized, trusted content and collaborate around the technologies you use most.
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