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https://issues.apache.org/jira/browse/HIVE-15881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15888510#comment-15888510
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Sergio Peña commented on HIVE-15881:
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[~leftylev] I added a few configurations on the wiki used for blobstore.
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-Blobstore(i.eAmazonS3)
> 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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