[jira] [Commented] (HIVE-15881) Use hive.exec.input.listing.max.threads variable name instead of mapred.dfsclient.parallelism.max

["Lefty Leverenz (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-15881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15887470#comment-15887470 ] 

Lefty Leverenz commented on HIVE-15881:
---------------------------------------

Doc note:  This adds *hive.exec.input.listing.max.threads* to HiveConf.java, so it needs to be documented in the wiki.  See HIVE-14270 and HIVE-15121 for other blobstore configs.

* [Hive Configuration Properties | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties]

Added a TODOC2.2 label.

> Use hive.exec.input.listing.max.threads variable name instead of mapred.dfsclient.parallelism.max
> -------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-15881
>                 URL: https://issues.apache.org/jira/browse/HIVE-15881
>             Project: Hive
>          Issue Type: Task
>          Components: Query Planning
>            Reporter: Sergio Peña
>            Assignee: Sergio Peña
>            Priority: Minor
>              Labels: TODOC2.2
>             Fix For: 2.2.0
>
>         Attachments: HIVE-15881.1.patch, HIVE-15881.2.patch, HIVE-15881.3.patch, HIVE-15881.4.patch, HIVE-15881.5.patch, HIVE-15881.6.patch
>
>
> The Utilities class has two methods, {{getInputSummary}} and {{getInputPaths}}, that use the variable {{mapred.dfsclient.parallelism.max}} to get the summary of a list of input locations in parallel. These methods are Hive related, but the variable name does not look it is specific for Hive.
> Also, the above variable is not on HiveConf nor used anywhere else. I just found a reference on the Hadoop MR1 code.
> I'd like to propose the deprecation of {{mapred.dfsclient.parallelism.max}}, and use a different variable name, such as {{hive.get.input.listing.num.threads}}, that reflects the intention of the variable. The removal of the old variable might happen on Hive 3.x



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