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https://issues.apache.org/jira/browse/HIVE-11528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15048061#comment-15048061
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Keisuke Ogiwara commented on HIVE-11528:
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Hi All,
I have two questions for this JIRA.
First, the work flow for query with "order by". I think we collect the results
of all the reducers into a HDFS file, and then output the file content to user
console, am I right?
Second, if I am right about the first question, what happened if we run a query
without "order by"? Do we collect the results of all the reducers into a HDFS
file just like what we do for query with "order by"? Or, we do not store the
results into a HDFS file. Instead, we output the results of reduces directly to
the console of the user?
Please could you give me some advice. Thank you.
> incrementally read query results when there's no ORDER BY
> ---------------------------------------------------------
>
> Key: HIVE-11528
> URL: https://issues.apache.org/jira/browse/HIVE-11528
> Project: Hive
> Issue Type: Improvement
> Reporter: Sergey Shelukhin
> Assignee: Keisuke Ogiwara
>
> May require HIVE-11527. When there's no ORDER BY and there's more than one
> reducer on the last stage of the query, it should be possible to return data
> to the user as it is produced, instead of waiting for all reducers to finish.
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