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Posted to issues@spark.apache.org by "Cheng Lian (JIRA)" <ji...@apache.org> on 2015/08/10 20:01:45 UTC
[jira] [Commented] (SPARK-9783) Use SqlNewHadoopRDD in JSONRelation
to eliminate extra refresh() call
[ https://issues.apache.org/jira/browse/SPARK-9783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14680457#comment-14680457 ]
Cheng Lian commented on SPARK-9783:
-----------------------------------
cc [~yhuai]
> Use SqlNewHadoopRDD in JSONRelation to eliminate extra refresh() call
> ---------------------------------------------------------------------
>
> Key: SPARK-9783
> URL: https://issues.apache.org/jira/browse/SPARK-9783
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.5.0
> Reporter: Cheng Lian
> Assignee: Cheng Lian
> Priority: Blocker
>
> PR #8035 made a quick fix for SPARK-9743 by introducing an extra {{refresh()}} call in {{JSONRelation.buildScan}}. Obviously it hurts performance. To overcome this, we can use {{SqlNewHadoopRDD}} there and override {{listStatus()}} to inject cached {{FileStatus}} instances, similar as what we did in {{ParquetRelation}}.
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