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Posted to issues@spark.apache.org by "Shixiong Zhu (JIRA)" <ji...@apache.org> on 2016/04/23 02:19:12 UTC
[jira] [Resolved] (SPARK-14832) Refactor DataSource to ensure
schema is inferred only once when creating a file stream
[ https://issues.apache.org/jira/browse/SPARK-14832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Shixiong Zhu resolved SPARK-14832.
----------------------------------
Resolution: Fixed
Fix Version/s: 2.0.0
> Refactor DataSource to ensure schema is inferred only once when creating a file stream
> --------------------------------------------------------------------------------------
>
> Key: SPARK-14832
> URL: https://issues.apache.org/jira/browse/SPARK-14832
> Project: Spark
> Issue Type: Sub-task
> Components: SQL, Streaming
> Reporter: Tathagata Das
> Assignee: Tathagata Das
> Fix For: 2.0.0
>
>
> When creating a file stream using sqlContext.write.stream(), existing files are scanned twice for finding the schema
> - Once, when creating a DataSource + StreamingRelation in the DataFrameReader.stream()
> - Again, when creating streaming Source from the DataSource, in DataSource.createSource()
> Instead, the schema should be generated only once, at the time of creating the dataframe, and when the streaming source is created, it should just reuse that schema
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