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https://issues.apache.org/jira/browse/IMPALA-6807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alex Rodoni resolved IMPALA-6807.
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Resolution: Fixed
> 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
>
> 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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