Dave Latham commented on HIVE-8808:

Bumped into this problem with another input format that wrapped an hbase input 
format.  The wrapper did not have hbase in its name.

I've gotta ask, though:  What's the purpose of caching a stateless object?

If M/R supports calling setConf as part of the instantiation system, that seems 
intended to initialize state.

> HiveInputFormat caching cannot work with all input formats
> ----------------------------------------------------------
>                 Key: HIVE-8808
>                 URL: https://issues.apache.org/jira/browse/HIVE-8808
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Brock Noland
>            Assignee: Brock Noland
>            Priority: Major
>             Fix For: 1.1.0
>         Attachments: HIVE-8808.patch, HIVE-8808.patch, HIVE-8808.patch
> In {{HiveInputFormat}} we implement instance caching (see 
> {{getInputFormatFromCache}}). In HS2, this assumes that InputFormats are 
> stateless but I don't think this assumption is true, especially with regards 
> to HBase.

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