Thanks Amareshwari. I can do that. Currently is it possible to create a single cube whose dimension were from Heterogonous storages like DBStorage,HDFSStorage and HBaseStorage.
Regards, Srinivasan Hariharan Mob +91-9940395830 From: amareshwarisr . [mailto:[email protected]] Sent: Wednesday, June 17, 2015 9:59 AM To: [email protected] Cc: Vijaya Chander Subject: Re: Cube Creation for Hive Tables Hello Srinivasan, We need create HBaseStorage. Created https://issues.apache.org/jira/browse/LENS-612 for tracking. HBaseStorage needs to be implemented on the similar lines of https://github.com/apache/incubator-lens/blob/master/lens-storage-db/src/main/java/org/apache/lens/storage/db/DBStorage.java Once we have HBaseStorage created, you can create your tables like the following, with HBaseStorageHandler and its properties: Create your storage like the following ( https://github.com/apache/incubator-lens/blob/master/lens-examples/src/main/resources/db-storage.xml ) : ---- <x_storage classname="org.apache.lens.storage.db.DBStorage" name="mydb" xmlns="uri:lens:cube:0.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="uri:lens:cube:0.1 cube-0.1.xsd "> <properties/> </x_storage> ---- And tables similar to https://github.com/apache/incubator-lens/blob/master/lens-examples/src/main/resources/city_subset.xml ---- <x_dimension_table dimension_name="city" table_name="city_subset" weight="100.0" xmlns="uri:lens:cube:0.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="uri:lens:cube:0.1 cube-0.1.xsd "> <columns> <column comment="ID" name="id" type="INT"/> <column comment="name" name="name" type="STRING"/> </columns> <storage_tables> <storage_table> <storage_name>mydb</storage_name> <table_desc external="true" field_delimiter="," table_location="/tmp/db-storage.db" storage_handler_name="org.apache.lens.storage.db.DBStorageHandler"> <table_parameters> <property name="lens.metastore.native.db.name<http://lens.metastore.native.db.name>" value="default"/> </table_parameters> </table_desc> </storage_table> </storage_tables> </x_dimension_table> ---- Writing HBaseStorage class should be simple, do you want to give it a try, as no special handling is required for HBase ? On Tue, Jun 16, 2015 at 6:52 PM, Srinivasan Hariharan02 <[email protected]<mailto:[email protected]>> wrote: Thanks Amareshwari. This partly answers my question. My need is, I have an external dim table in hive which uses Hbase storage handler. So the data for this table is located in Hbase, not directly under hdfs file location. So how can I create dimension for these kind of tables in Lens without moving the data to HDFS. Regards, Srinivasan Hariharan Mob +91-9940395830<tel:%2B91-9940395830> From: amareshwarisr . [mailto:[email protected]<mailto:[email protected]>] Sent: Tuesday, June 16, 2015 6:16 PM To: [email protected]<mailto:[email protected]> Subject: Re: Cube Creation for Hive Tables Srinivasan Hariharan, I will try to explain how city table is created in examples. Let me see if that helps you? If you see https://github.com/apache/incubator-lens/blob/master/lens-examples/src/main/resources/city.xml: ---- <x_dimension name="city" xmlns="uri:lens:cube:0.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="uri:lens:cube:0.1 cube-0.1.xsd "> <attributes> <dim_attribute name="id" type="INT"/> <dim_attribute name="name" type="STRING"/> <dim_attribute name="POI" type="ARRAY<STRING>" description="Point of interests"/> <dim_attribute name="population" type="BIGINT" /> </attributes> <properties> <property name="dimension.city.timed.dimension" value="dt"/> </properties> </x_dimension> ---- Above of definition of city defines dimension city and its attribute. This is only logical table, not linked to any physical table. Then we have https://github.com/apache/incubator-lens/blob/master/lens-examples/src/main/resources/city_table.xml - Which defines the dimtable associated with dimension city ---- <x_dimension_table dimension_name="city" table_name="city_table" weight="10.0" xmlns="uri:lens:cube:0.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="uri:lens:cube:0.1 cube-0.1.xsd "> <columns> <column comment="ID" name="id" type="INT"/> <column comment="name" name="name" type="STRING"/> <column comment="Point of interests" name="POI" type="ARRAY<STRING>"/> <column comment="city population" name="population" type="BIGINT"/> </columns> <properties> <property name="city.prop" value="d1"/> </properties> <storage_tables> <storage_table> <update_periods> <update_period>HOURLY</update_period> </update_periods> <storage_name>local</storage_name> <table_desc external="true" field_delimiter="," collection_delimiter=":" table_location="/tmp/examples/city"> <part_cols> <column comment="Time column" name="dt" type="STRING"/> </part_cols> <time_part_cols>dt</time_part_cols> </table_desc> </storage_table> </storage_tables> </x_dimension_table> ---- Here the above definition will be mapped to table on HDFS - which is Text formatted with delimiters specified above. Are you looking for something which uses existing tables to create facts and dimensions - https://issues.apache.org/jira/browse/LENS-340 ? Right now, that feature is not there. Until then you have to map lens created table as external table to your existing table. For ex: You have Hive table Table1 : col1, col2; Create Dimension1 : col1, col2 as dim attributes - give schema for them. Create DimTable1 : col1, col2 associated with Dimension1. Then you should be good. Let us know if above answers your query. Or let us know if you are looking for something else. Thanks Amareshwari On Tue, Jun 16, 2015 at 1:02 PM, Srinivasan Hariharan02 <[email protected]<mailto:[email protected]>> wrote: Hi, I have all my Dim tables in Hive, I want to create cube on top of these tables using lens. Can anyone provide how ca I start doing that. I have checked the examples in the resources directory under client folder. It doesn’t help much for creation of storage dim, facts from hive tables. Help is much appreciated. Regards, Srinivasan Hariharan Mob +91-9940395830<tel:%2B91-9940395830> **************** CAUTION - Disclaimer ***************** This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. 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