Hi Bryan,
Thanks for this detailed explanation. We have also experimented with importing bzip2 files and Hive is pretty good at handling them. We also need to negotiate empty lines and columns defined as currencies. I still think that mapping external table to raw files (not filtered) is the correct way of doing it (ELT as opposed to ETL) Our problem is the best way of creating the target table in Hive to have the filtered data and use the data as opposed to storing it only. Do you have any suggestion in this area? Cheers, Dr Mich Talebzadeh LinkedIn <https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABU rV8Pw> https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUr V8Pw Sybase ASE 15 Gold Medal Award 2008 A Winning Strategy: Running the most Critical Financial Data on ASE 15 <http://login.sybase.com/files/Product_Overviews/ASE-Winning-Strategy-091908 .pdf> http://login.sybase.com/files/Product_Overviews/ASE-Winning-Strategy-091908. pdf Author of the books "A Practitioner's Guide to Upgrading to Sybase ASE 15", ISBN 978-0-9563693-0-7. co-author "Sybase Transact SQL Guidelines Best Practices", ISBN 978-0-9759693-0-4 Publications due shortly: Complex Event Processing in Heterogeneous Environments, ISBN: 978-0-9563693-3-8 Oracle and Sybase, Concepts and Contrasts, ISBN: 978-0-9563693-1-4, volume one out shortly <http://talebzadehmich.wordpress.com/> http://talebzadehmich.wordpress.com NOTE: The information in this email is proprietary and confidential. This message is for the designated recipient only, if you are not the intended recipient, you should destroy it immediately. Any information in this message shall not be understood as given or endorsed by Peridale Technology Ltd, its subsidiaries or their employees, unless expressly so stated. It is the responsibility of the recipient to ensure that this email is virus free, therefore neither Peridale Technology Ltd, its subsidiaries nor their employees accept any responsibility. From: Gerber, Bryan W [mailto:bryan.ger...@pnnl.gov] Sent: 14 January 2016 00:13 To: user@hive.apache.org Subject: RE: Loading data containing newlines 1. hdfs dfs -copyFromLocal /incoming/files/*.bz2 hdfs://host.name/data/stg/table/ 2. CREATE EXTERNAL TABLE stg_<table> (cols.) ROW FORMAT serde 'org.apache.hadoop.hive.serde2.OpenCSVSerde' STORED AS TEXTFILE LOCATION '/data/stg/table/' 3. CREATE TABLE <table> (cols.) STORE AS ORC tblproperties ("orc.compress"="ZLIB"); 4. INSERT INTO TABLE <table> SELECT cols, udf1(cola), udf2(colb),functions(),etc. FROM ext_<table> 5. Delete files from hdfs://host.name/data/stg/table/ This has been working quite well, until our newest data contains fields with embedded newlines. We are now looking into options further up the pipeline to see if we can condition the data earlier in the process. From: Mich Talebzadeh [mailto:m...@peridale.co.uk] Sent: Wednesday, January 13, 2016 10:34 AM To: user@hive.apache.org <mailto:user@hive.apache.org> Subject: RE: Loading data containing newlines Thanks Brian. Just to clarify do you use something like below? 1. hdfs dfs -copyFromLocal /var/tmp/t.bcp hdfs://rhes564.hedat.net:9000/misc/t.bcp 2. CREATE EXTERNAL TABLE <TABLE> name (col1 INT, col2 string, .) COMMENT 'load from bcp file'ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' STORED AS ORC Cheers, Dr Mich Talebzadeh LinkedIn <https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABU rV8Pw> https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUr V8Pw Sybase ASE 15 Gold Medal Award 2008 A Winning Strategy: Running the most Critical Financial Data on ASE 15 <http://login.sybase.com/files/Product_Overviews/ASE-Winning-Strategy-091908 .pdf> http://login.sybase.com/files/Product_Overviews/ASE-Winning-Strategy-091908. pdf Author of the books "A Practitioner's Guide to Upgrading to Sybase ASE 15", ISBN 978-0-9563693-0-7. co-author "Sybase Transact SQL Guidelines Best Practices", ISBN 978-0-9759693-0-4 Publications due shortly: Complex Event Processing in Heterogeneous Environments, ISBN: 978-0-9563693-3-8 Oracle and Sybase, Concepts and Contrasts, ISBN: 978-0-9563693-1-4, volume one out shortly <http://talebzadehmich.wordpress.com/> http://talebzadehmich.wordpress.com NOTE: The information in this email is proprietary and confidential. This message is for the designated recipient only, if you are not the intended recipient, you should destroy it immediately. Any information in this message shall not be understood as given or endorsed by Peridale Technology Ltd, its subsidiaries or their employees, unless expressly so stated. It is the responsibility of the recipient to ensure that this email is virus free, therefore neither Peridale Ltd, its subsidiaries nor their employees accept any responsibility. From: Gerber, Bryan W [mailto:bryan.ger...@pnnl.gov] <mailto:[mailto:bryan.ger...@pnnl.gov]> Sent: 13 January 2016 18:12 To: user@hive.apache.org <mailto:user@hive.apache.org> Subject: RE: Loading data containing newlines We are pushing the compressed text files into HDFS directory for Hive EXTERNAL table, then using an INSERT on the table using ORC storage. We are letting Hive handle the ORC file creation process. From: Mich Talebzadeh [mailto:m...@peridale.co.uk] Sent: Tuesday, January 12, 2016 4:41 PM To: user@hive.apache.org <mailto:user@hive.apache.org> Subject: RE: Loading data containing newlines Hi Bryan, As a matter of interest are you loading text files into local directories in encrypted format at all and then push it into HDFS/Hive as ORC? Thanks Dr Mich Talebzadeh LinkedIn <https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABU rV8Pw> https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUr V8Pw Sybase ASE 15 Gold Medal Award 2008 A Winning Strategy: Running the most Critical Financial Data on ASE 15 <http://login.sybase.com/files/Product_Overviews/ASE-Winning-Strategy-091908 .pdf> http://login.sybase.com/files/Product_Overviews/ASE-Winning-Strategy-091908. pdf Author of the books "A Practitioner's Guide to Upgrading to Sybase ASE 15", ISBN 978-0-9563693-0-7. co-author "Sybase Transact SQL Guidelines Best Practices", ISBN 978-0-9759693-0-4 Publications due shortly: Complex Event Processing in Heterogeneous Environments, ISBN: 978-0-9563693-3-8 Oracle and Sybase, Concepts and Contrasts, ISBN: 978-0-9563693-1-4, volume one out shortly <http://talebzadehmich.wordpress.com/> http://talebzadehmich.wordpress.com NOTE: The information in this email is proprietary and confidential. This message is for the designated recipient only, if you are not the intended recipient, you should destroy it immediately. Any information in this message shall not be understood as given or endorsed by Peridale Technology Ltd, its subsidiaries or their employees, unless expressly so stated. It is the responsibility of the recipient to ensure that this email is virus free, therefore neither Peridale Ltd, its subsidiaries nor their employees accept any responsibility. From: Gerber, Bryan W [mailto:bryan.ger...@pnnl.gov] Sent: 12 January 2016 17:41 To: user@hive.apache.org <mailto:user@hive.apache.org> Subject: Loading data containing newlines We are attempting to load CSV text files (compressed to bz2) containing newlines in fields using EXTERNAL tables and INSERT/SELECT into ORC format tables. Data volume is ~1TB/day, we are really trying to avoid unpacking them to condition the data. A few days of research has us ready to implement custom input/output formats to handle the ingest. Any other suggestions that may be less effort with low impact to load times? Thanks, Bryan G.
