[jira] [Created] (HIVE-19494) Accept shade prefix during reflective instantiation of output format

["Prasanth Jayachandran (JIRA)" <ji...@apache.org>]

Prasanth Jayachandran created HIVE-19494:
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             Summary: Accept shade prefix during reflective instantiation of output format
                 Key: HIVE-19494
                 URL: https://issues.apache.org/jira/browse/HIVE-19494
             Project: Hive
          Issue Type: Sub-task
          Components: Streaming
    Affects Versions: 3.0.0, 3.1.0
            Reporter: Prasanth Jayachandran
            Assignee: Prasanth Jayachandran


Hive Streaming API jars are sometimes shaded with a different prefix when used in environments where another version of hive already exists (spark for example). In most cases, shading is done with rename of classes with some prefix. If an uber/assembly jar is generated with renamed prefix, Hive Streaming API will not work as Hive Streaming API will reflectively instantiate outputformat class using FQCN string provided by metastore table storage descriptor object. 
For example: 
RecordWriter will create instance of OutputFormat using string "org.apache.hadoop.hive.ql.io.orc.OrcOutputFormat". When a shaded jar with renames class references are used, this class will not be found by the classloader. 

We can optionally accept a shade prefix from user which will be tried (as fallback) when ClassNotFoundException is thrown.



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