[jira] [Created] (HIVE-28646) Multiple documents for `hive.execution.engine` appear to be out of date

["Qiheng He (Jira)" <ji...@apache.org>]

Qiheng He created HIVE-28646:
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             Summary: Multiple documents for `hive.execution.engine` appear to be out of date
                 Key: HIVE-28646
                 URL: https://issues.apache.org/jira/browse/HIVE-28646
             Project: Hive
          Issue Type: Improvement
      Security Level: Public (Viewable by anyone)
            Reporter: Qiheng He


- According to https://github.com/apache/hive/pull/4973 , the default value of *hive.execution.engine* should now be {*}tez{*}.
- But https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=27842758#ConfigurationProperties-hive.execution.engine still records that the default value of *hive.execution.engine* is *mr*.

{code:none}
hive.execution.engine
Default Value: mr (deprecated in Hive 2.0.0 – see below)
Added In: Hive 0.13.0 with HIVE-6103 and HIVE-6098
Chooses execution engine. Options are: mr (Map Reduce, default), tez (Tez execution, for Hadoop 2 only), or spark (Spark execution, for Hive 1.1.0 onward).
While mr remains the default engine for historical reasons, it is itself a historical engine and is deprecated in the Hive 2 line (HIVE-12300). It may be removed without further warning.
See Hive on Tez and Hive on Spark for more information, and see the Tez section and the Spark section below for their configuration properties.
{code}

- At the same time, the *Hive on Spark* documentation also records that the default value of *hive.execution.engine* is *mr*. This seems too disconnected. See https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=42567714#HiveonSpark-2.1ANewExecutionEngine .

{code:none}
We will introduce a new execution, Spark, in addition to existing MapReduce and Tez. To use Spark as an execution engine in Hive, set the following:
set hive.execution.engine=spark;
The default value for this configuration is still “mr”. 
{code}



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