[
https://issues.apache.org/jira/browse/HIVE-4660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13870645#comment-13870645
]
Lefty Leverenz commented on HIVE-4660:
--------------------------------------
... and there was Tez. But mere mortals don't rest on the seventh day: can
the design doc be updated now?
For example, "Functional requirements of phase I" mentions hive.optimize.tez
but hasn't that been replaced by hive.execution.engine?
Also a recent HiveConf.java doesn't contain mapreduce.framework.name which is
mentioned in the design doc, but it does contain hive.compute.splits.in.am with
the comment "Whether to generate the splits locally or in the AM (tez only)."
Are there any more Tez config params?
Here's the doc link:
https://cwiki.apache.org/confluence/display/Hive/Hive+on+Tez#HiveonTez-FunctionalrequirementsofphaseI
> Let there be Tez
> ----------------
>
> Key: HIVE-4660
> URL: https://issues.apache.org/jira/browse/HIVE-4660
> Project: Hive
> Issue Type: New Feature
> Reporter: Gunther Hagleitner
> Assignee: Gunther Hagleitner
> Fix For: 0.13.0
>
>
> Tez is a new application framework built on Hadoop Yarn that can execute
> complex directed acyclic graphs of general data processing tasks. Here's the
> project's page: http://incubator.apache.org/projects/tez.html
> The interesting thing about Tez from Hive's perspective is that it will over
> time allow us to overcome inefficiencies in query processing due to having to
> express every algorithm in the map-reduce paradigm.
> The barrier to entry is pretty low as well: Tez can actually run unmodified
> MR jobs; But as a first step we can without much trouble start using more of
> Tez' features by taking advantage of the MRR pattern.
> MRR simply means that there can be any number of reduce stages following a
> single map stage - without having to write intermediate results to HDFS and
> re-read them in a new job. This is common when queries require multiple
> shuffles on keys without correlation (e.g.: join - grp by - window function -
> order by)
> For more details see the design doc here:
> https://cwiki.apache.org/confluence/display/Hive/Hive+on+Tez
--
This message was sent by Atlassian JIRA
(v6.1.5#6160)
