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Posted to issues@impala.apache.org by "Quanlong Huang (JIRA)" <ji...@apache.org> on 2019/02/18 07:50:00 UTC

[jira] [Created] (IMPALA-8210) Support reading/writing tiny RDBMS tables

Quanlong Huang created IMPALA-8210:
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             Summary: Support reading/writing tiny RDBMS tables
                 Key: IMPALA-8210
                 URL: https://issues.apache.org/jira/browse/IMPALA-8210
             Project: IMPALA
          Issue Type: New Feature
            Reporter: Quanlong Huang


It'd be quite helpful if Impala can read/write some tiny RDBMS(MySQL/Postgres/SQLServer) tables. Parallelism or efficiency can be ignored since the target tables are all tiny. Some use cases:
 * Some dimension tables in Hive are snapshots of RDBMS tables. Users want to query the difference between the snapshot in Hive and the latest data in RDBMS.
 * Users want to run queries joining Hive fact tables and the latest data in RDBMS.
 * Users hope their query results can be ingested into MySQL directly

Implement an "External Data Source" as a generic JDBC wrapper for RDBMS data sources could be a solution. The drawback is that "External Data Source" requires users to create tables in Impala for each RDBMS table they want to access. Users can't list tables (show tables) of a schema(database). 

There're other solutions that support RDBMS directly. For example https://www.slideshare.net/liuknag/cloudera-impala-postgre-sql-29025605



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