Alex Rodoni closed IMPALA-6807.

> Known Issues needs to be updated to reflect resolution of HDFS-12528
> --------------------------------------------------------------------
>                 Key: IMPALA-6807
>                 URL: https://issues.apache.org/jira/browse/IMPALA-6807
>             Project: IMPALA
>          Issue Type: Sub-task
>          Components: Docs
>    Affects Versions: Impala 2.12.0
>            Reporter: Joe McDonnell
>            Assignee: Alex Rodoni
>            Priority: Major
>             Fix For: Impala 2.12.0
> In docs/topics/impala_known_issues.xml, we have a section 
> "ki_file_handle_cache" that covers the interaction of the file handle cache 
> with short circuit reads. This is related to the HDFS issue HDFS-12528.
> HDFS-12528 is resolved. The way it was resolved is to introduce an HDFS 
> parameter dfs.domain.socket.disable.interval.seconds that specifies the 
> amount of time that short circuit reads are disabled. The default value for 
> upstream Hadoop is 10 minutes (600 seconds). It can be customized, and the 
> default value for CDH is 1 second. 
> I think this section should recommend running with 
> dfs.domain.socket.disable.interval.seconds set to a small value (CDH uses 1 
> second) when using file handle cache. However, 0 is not recommended. 

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