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Posted to issues@hive.apache.org by "Lefty Leverenz (JIRA)" <ji...@apache.org> on 2017/10/15 06:20:00 UTC
[jira] [Comment Edited] (HIVE-15928) Parallelization of Select
queries in Druid handler
[ https://issues.apache.org/jira/browse/HIVE-15928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15880047#comment-15880047 ]
Lefty Leverenz edited comment on HIVE-15928 at 10/15/17 6:19 AM:
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Doc note: This adds configuration parameter *hive.druid.select.distribute* and amends the description of *hive.druid.select.threshold*, which was created by HIVE-14217 (also in 2.2.0). They need to be documented in the wiki.
* [Configuration Properties -- Query and DDL Execution | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-QueryandDDLExecution]
* [Druid Integration | https://cwiki.apache.org/confluence/display/Hive/Druid+Integration]
Added a TODOC2.2 label.
Update 15/Oct/17: *hive.druid.select.distribute* is removed in 3.0.0 by HIVE-17761.
was (Author: lefty@hortonworks.com):
Doc note: This adds configuration parameter *hive.druid.select.distribute* and amends the description of *hive.druid.select.threshold*, which was created by HIVE-14217 (also in 2.2.0). They need to be documented in the wiki.
* [Configuration Properties -- Query and DDL Execution | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-QueryandDDLExecution]
* [Druid Integration | https://cwiki.apache.org/confluence/display/Hive/Druid+Integration]
Added a TODOC2.2 label.
> Parallelization of Select queries in Druid handler
> --------------------------------------------------
>
> Key: HIVE-15928
> URL: https://issues.apache.org/jira/browse/HIVE-15928
> Project: Hive
> Issue Type: Sub-task
> Components: Druid integration
> Affects Versions: 2.2.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Labels: TODOC2.2
> Fix For: 2.3.0
>
> Attachments: HIVE-15928.01.patch, HIVE-15928.02.patch, HIVE-15928.patch
>
>
> Even if we split a Select query along its time dimension, parallelization is limited as all queries will hit the broker node. Instead, we can interrogate the broker to get the Druid nodes that contain the data, and query those nodes directly.
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