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From "Lefty Leverenz (JIRA)" <>
Subject [jira] [Commented] (HIVE-9492) Enable caching in MapInput for Spark
Date Mon, 02 Feb 2015 03:13:34 GMT


Lefty Leverenz commented on HIVE-9492:

Doc review:  Please capitalize Hive and Spark in the parameter description, and change initial
"If" to "Whether".  And shouldn't "mapinput" be "MapInput"?

+    HIVE_CACHE_MAPINPUT("hive.exec.cache.mapinput", false,
+        "Whether Hive (in Spark mode only) should cache MapInput if it applies."),

> Enable caching in MapInput for Spark
> ------------------------------------
>                 Key: HIVE-9492
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: Spark
>            Reporter: Xuefu Zhang
>            Assignee: Jimmy Xiang
>             Fix For: spark-branch
>         Attachments: HIVE-9492.1-spark.patch, HIVE-9492.2-spark.patch, prototype.patch
> Because of the IOContext problem (HIVE-8920, HIVE-9084), RDD caching is currently disabled
in MapInput. Prototyping shows that the problem can solved. Thus, we should formalize the
prototype and enable the caching. A good query to test this is:
> {code}
> from (select * from dec union all select * from dec2) s
> insert overwrite table dec3 select, sum(s.value) group by
> insert overwrite table dec4 select, s.value order by s.value;
> {code}

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