Re: Partitioning confusion
if you have a 250GB file, then how did it become 2.5TB ? if you can not write a mapreduce job to process to write your data into specific partitions, then the other way around would be load the entire data into a temporary table and then load data into partitioned tabled and then drop the temporary table. approach would be 1) Create a temporary table CREATE TABLE temp_employees (name STRING, salary FLOAT, subordinates ARRAY, deductions MAP, address STRUCT ); 2) Load data into this table LOAD DATA LOCAL INPATH '/home/satish/data/employees/input/employees-country.txt' INTO TABLE temp_employees; 3) Create partitoned table CREATE TABLE employees (name STRING, salary FLOAT, subordinates ARRAY, deductions MAP, address STRUCT ) PARTITIONED BY (country STRING, state STRING); 2) Load data from temporary data into partitioned tables 2a) if there are already partitions existing then be careful giving a blanket query or it will overwrite data into exisiting partitions insert overwrite employees partition(country='USA',state='IL') select * from temp_employees where country="USA" and state ="IL"; this you will need to do for all of them 2b) if your partitioned table is empty currently then you can just enable dynamic partitioning and hive will take care of adding correct data into individual partitions set hive.exec.dynamic.partition.mode=nonstrict; set hive.exec.dynamic.partition=true; insert overwrite table employees select * from employees; 3) drop the temporary table by doing above approach you will have your data being replicated 2x times of replication factor for sometime but then once you drop temporary table it will be normal HDFS replication factor size data. Its been sometime I have worked on hive so others may have better approaches as well, so wait for someone to correct me before going further :) On Mon, May 27, 2013 at 2:13 PM, Sai Sai wrote: > Nitin > I am still confused, from the below data that i have given should the > file which sits in the folder Country=USA and state=IL have only the rows > where Country=USA and state=IL or will it have rows of other countries also. > The reason i ask is because if we have a 250GB file and would like to > create 10 partitions that would end up in 2.5 TB * 3 = 7.5TB. Is this > expected. > Thanks > S > > -- > *From:* Nitin Pawar > *To:* user@hive.apache.org; Sai Sai > *Sent:* Monday, 27 May 2013 2:08 PM > *Subject:* Re: Partitioning confusion > > when you specify the load data query with specific partition, it will put > the entire data into that partition. > > > > On Mon, May 27, 2013 at 1:08 PM, Sai Sai wrote: > > > After creating a partition for a country (USA) and state (IL) and when we > go to the the hdfs site to look at the partition in the browser we r seeing > all the records for all the countries and states rather than just for the > partition created for US and IL given below, is this correct behavior: > > Here is my commands: > > > CREATE TABLE employees (name STRING, salary FLOAT, subordinates > ARRAY, deductions MAP, address STRUCT city:STRING, state:STRING, zip:INT, country:STRING> ) PARTITIONED BY > (country STRING, state STRING); > > LOAD DATA LOCAL INPATH > '/home/satish/data/employees/input/employees-country.txt' INTO TABLE > employees PARTITION (country='USA',state='IL'); > > > Here is my original data file, where i have a few countries data such as > USA, INDIA, UK, AUS: > > > John Doe10.0Mary SmithTodd JonesFederal Taxes.2State > Taxes.05Insurance.11 Michigan Ave.ChicagoIL60600USA > Mary Smith8.0Bill KingFederal Taxes.2State Taxes.05Insurance.1100 > Ontario St.ChicagoIL60601USA > Todd Jones7.0Federal Taxes.15State Taxes.03Insurance.1200 Chicago > Ave.Oak ParkIL60700USA > Bill King6.0Federal Taxes.15State Taxes.03Insurance.1300 Obscure > Dr.ObscuriaIL60100USA > Boss Man20.0John DoeFred FinanceFederal Taxes.3State > Taxes.07Insurance.051 Pretentious Drive.ChicagoIL60500USA > Fred Finance15.0Stacy AccountantFederal Taxes.3State > Taxes.07Insurance.052 Pretentious Drive.ChicagoIL60500USA > Stacy Accountant6.0Federal Taxes.15State Taxes.03Insurance.1300 Main > St.NapervilleIL60563USA > John Doe 210.0Mary SmithTodd JonesFederal Taxes.2State > Taxes.05Insurance.11 Michigan Ave.ChicagoIL60600INDIA > Mary Smith 28.0Bill KingFederal Taxes.2State Taxes.05Insurance.1100 > Ontario St.ChicagoIL60601INDIA > Todd Jones 27.0Federal Taxes.15State Taxes.03Insurance.1200 Chicago > Ave.Oak ParkIL60700AUSTRALIA > Bill King 26.0Federal Taxes.15State Taxes.03Insurance.1300 Obscure > Dr.ObscuriaIL60100AUSTRA
Re: Partitioning confusion
Nitin I am still confused, from the below data that i have given should the file which sits in the folder Country=USA and state=IL have only the rows where Country=USA and state=IL or will it have rows of other countries also. The reason i ask is because if we have a 250GB file and would like to create 10 partitions that would end up in 2.5 TB * 3 = 7.5TB. Is this expected. Thanks S From: Nitin Pawar To: user@hive.apache.org; Sai Sai Sent: Monday, 27 May 2013 2:08 PM Subject: Re: Partitioning confusion when you specify the load data query with specific partition, it will put the entire data into that partition. On Mon, May 27, 2013 at 1:08 PM, Sai Sai wrote: > >After creating a partition for a country (USA) and state (IL) and when we go >to the the hdfs site to look at the partition in the browser we r seeing all >the records for all the countries and states rather than just for the >partition created for US and IL given below, is this correct behavior: > >Here is my commands: > > > > >CREATE TABLE employees (name STRING, salary FLOAT, subordinates ARRAY, >deductions MAP, address STRUCTstate:STRING, zip:INT, country:STRING> ) PARTITIONED BY (country STRING, state >STRING); > > >LOAD DATA LOCAL INPATH >'/home/satish/data/employees/input/employees-country.txt' INTO TABLE employees >PARTITION (country='USA',state='IL'); > > > > >Here is my original data file, where i have a few countries data such as USA, >INDIA, UK, AUS: > > > > >John Doe10.0Mary SmithTodd JonesFederal Taxes.2State Taxes.05Insurance.11 >Michigan Ave.ChicagoIL60600USA >Mary Smith8.0Bill KingFederal Taxes.2State Taxes.05Insurance.1100 Ontario >St.ChicagoIL60601USA >Todd Jones7.0Federal Taxes.15State Taxes.03Insurance.1200 Chicago Ave.Oak >ParkIL60700USA >Bill King6.0Federal Taxes.15State Taxes.03Insurance.1300 Obscure >Dr.ObscuriaIL60100USA >Boss Man20.0John DoeFred FinanceFederal Taxes.3State Taxes.07Insurance.051 >Pretentious Drive.ChicagoIL60500USA >Fred Finance15.0Stacy AccountantFederal Taxes.3State Taxes.07Insurance.052 >Pretentious Drive.ChicagoIL60500USA >Stacy Accountant6.0Federal Taxes.15State Taxes.03Insurance.1300 Main >St.NapervilleIL60563USA >John Doe 210.0Mary SmithTodd JonesFederal Taxes.2State >Taxes.05Insurance.11 Michigan Ave.ChicagoIL60600INDIA >Mary Smith 28.0Bill KingFederal Taxes.2State Taxes.05Insurance.1100 >Ontario St.ChicagoIL60601INDIA >Todd Jones 27.0Federal Taxes.15State Taxes.03Insurance.1200 Chicago >Ave.Oak ParkIL60700AUSTRALIA >Bill King 26.0Federal Taxes.15State Taxes.03Insurance.1300 Obscure >Dr.ObscuriaIL60100AUSTRALIA >Boss Man2 20.0John DoeFred FinanceFederal Taxes.3State >Taxes.07Insurance.051 Pretentious Drive.ChicagoIL60500UK >Fred Finance 215.0Stacy AccountantFederal Taxes.3State >Taxes.07Insurance.052 Pretentious Drive.ChicagoIL60500UK >Stacy Accountant 26.0Federal Taxes.15State Taxes.03Insurance.1300 Main >St.NapervilleIL60563UK > > >Now when i navigate to: >Contents of directory >/user/hive/warehouse/db1.db/employees/country=USA/state=IL > > > >I see all the records and was wondering if it should have only USA & IL >records. >Please help. -- Nitin Pawar
Re: Partitioning confusion
when you specify the load data query with specific partition, it will put the entire data into that partition. On Mon, May 27, 2013 at 1:08 PM, Sai Sai wrote: > > After creating a partition for a country (USA) and state (IL) and when we > go to the the hdfs site to look at the partition in the browser we r seeing > all the records for all the countries and states rather than just for the > partition created for US and IL given below, is this correct behavior: > > Here is my commands: > > > CREATE TABLE employees (name STRING, salary FLOAT, subordinates > ARRAY, deductions MAP, address STRUCT city:STRING, state:STRING, zip:INT, country:STRING> ) PARTITIONED BY > (country STRING, state STRING); > > LOAD DATA LOCAL INPATH > '/home/satish/data/employees/input/employees-country.txt' INTO TABLE > employees PARTITION (country='USA',state='IL'); > > > Here is my original data file, where i have a few countries data such as > USA, INDIA, UK, AUS: > > > John Doe10.0Mary SmithTodd JonesFederal Taxes.2State > Taxes.05Insurance.11 Michigan Ave.ChicagoIL60600USA > Mary Smith8.0Bill KingFederal Taxes.2State Taxes.05Insurance.1100 > Ontario St.ChicagoIL60601USA > Todd Jones7.0Federal Taxes.15State Taxes.03Insurance.1200 Chicago > Ave.Oak ParkIL60700USA > Bill King6.0Federal Taxes.15State Taxes.03Insurance.1300 Obscure > Dr.ObscuriaIL60100USA > Boss Man20.0John DoeFred FinanceFederal Taxes.3State > Taxes.07Insurance.051 Pretentious Drive.ChicagoIL60500USA > Fred Finance15.0Stacy AccountantFederal Taxes.3State > Taxes.07Insurance.052 Pretentious Drive.ChicagoIL60500USA > Stacy Accountant6.0Federal Taxes.15State Taxes.03Insurance.1300 Main > St.NapervilleIL60563USA > John Doe 210.0Mary SmithTodd JonesFederal Taxes.2State > Taxes.05Insurance.11 Michigan Ave.ChicagoIL60600INDIA > Mary Smith 28.0Bill KingFederal Taxes.2State Taxes.05Insurance.1100 > Ontario St.ChicagoIL60601INDIA > Todd Jones 27.0Federal Taxes.15State Taxes.03Insurance.1200 Chicago > Ave.Oak ParkIL60700AUSTRALIA > Bill King 26.0Federal Taxes.15State Taxes.03Insurance.1300 Obscure > Dr.ObscuriaIL60100AUSTRALIA > Boss Man2 20.0John DoeFred FinanceFederal Taxes.3State > Taxes.07Insurance.051 Pretentious Drive.ChicagoIL60500UK > Fred Finance 215.0Stacy AccountantFederal Taxes.3State > Taxes.07Insurance.052 Pretentious Drive.ChicagoIL60500UK > Stacy Accountant 26.0Federal Taxes.15State Taxes.03Insurance.1300 Main > St.NapervilleIL60563UK > > Now when i navigate to: > Contents of directory > /user/hive/warehouse/db1.db/employees/country=USA/state=IL > > I see all the records and was wondering if it should have only USA & IL > records. > Please help. > -- Nitin Pawar
