Github user vesense commented on the pull request:
https://github.com/apache/storm/pull/1021#issuecomment-172182776
@arunmahadevan
This class is used by StormSQL.
>In StormSQL data is represented by external tables. Users can specify data
sources using the CREATE EXTERNAL TABLE statement.
* kafka as data source
use XXXSerializer for data ser.
* kafka as data sink
use `org/apache/storm/spout/MultiScheme.java` for data deser.
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