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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