hive-partitions

问题 I have a requirement to insert streaming of records into Hive partitioned table. The table structure is something like CREATE TABLE store_transation ( item_name string, item_count int, bill_number int, ) PARTITIONED BY ( yyyy_mm_dd string ); I would like to understand how Hive handles inserts in the internal table. Does all record insert into a single file inside the yyyy_mm_dd=2018_08_31 directory? Or hive splits into multiple files inside a partition, if so when? Which one performs well

问题 I have a requirement to insert streaming of records into Hive partitioned table. The table structure is something like CREATE TABLE store_transation ( item_name string, item_count int, bill_number int, ) PARTITIONED BY ( yyyy_mm_dd string ); I would like to understand how Hive handles inserts in the internal table. Does all record insert into a single file inside the yyyy_mm_dd=2018_08_31 directory? Or hive splits into multiple files inside a partition, if so when? Which one performs well

来源： https://stackoverflow.com/questions/60829198/how-to-getting-latest-partition-data-from-hive

问题 I would like to know what is the best possible way(s) of adding partitions to the external table. I have a external table on S3 in hive with the partition as vehicle=/date=/hr= Now new vehicle can be added at any time of day and there will be vehicles which will not have data for a couple of hours in a day or for couple of days. Few possible solutions - msck reapir table : It takes a lot of time - Add partition via script : I may not know when new vehicle gets created or which hour data is

问题 I would like to know what is the best possible way(s) of adding partitions to the external table. I have a external table on S3 in hive with the partition as vehicle=/date=/hr= Now new vehicle can be added at any time of day and there will be vehicles which will not have data for a couple of hours in a day or for couple of days. Few possible solutions - msck reapir table : It takes a lot of time - Add partition via script : I may not know when new vehicle gets created or which hour data is

问题 1) If the partitioned column doesn't have data, so when you query on that, what error will you get? 2)If some rows doesn't have the partitioned column , the how those rows will be handled? will there be any data loss? 3)Why bucketing needs to be done with numeric column? Can we use string column also? what is the process and on what basis you will choose the bucketing column? 4) Will the internal table details will also be stored in the metastore? Or only external table details will be stored

问题 1) If the partitioned column doesn't have data, so when you query on that, what error will you get? 2)If some rows doesn't have the partitioned column , the how those rows will be handled? will there be any data loss? 3)Why bucketing needs to be done with numeric column? Can we use string column also? what is the process and on what basis you will choose the bucketing column? 4) Will the internal table details will also be stored in the metastore? Or only external table details will be stored

问题 1) If the partitioned column doesn't have data, so when you query on that, what error will you get? 2)If some rows doesn't have the partitioned column , the how those rows will be handled? will there be any data loss? 3)Why bucketing needs to be done with numeric column? Can we use string column also? what is the process and on what basis you will choose the bucketing column? 4) Will the internal table details will also be stored in the metastore? Or only external table details will be stored

问题 I am trying to run insert overwrite over a partitioned table. The select query of insert overwrite omits one partition completely. Is it the expected behavior? Table definition CREATE TABLE `cities_red`( `cityid` int, `city` string) PARTITIONED BY ( `state` string) ROW FORMAT SERDE 'org.apache.hadoop.hive.ql.io.orc.OrcSerde' STORED AS INPUTFORMAT 'org.apache.hadoop.hive.ql.io.orc.OrcInputFormat' OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.orc.OrcOutputFormat' TBLPROPERTIES ( 'auto.purge'='true

问题 My partition is based on year/month/date. Using SimpleDateFormat for week year created a wrong partition . The data for the date 2017-31-12 was moved to 2018-31-12 using YYYY in the date format. SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd"); So what I want is to move my data from partition 2018/12/31 to 2017/12/31 of the same table. I did not find any relevant documentation to do the same. 回答1: From what I understood, you would like to move the data from 2018-12-31 partition to