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https://issues.apache.org/jira/browse/SPARK-17264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15445420#comment-15445420
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Apache Spark commented on SPARK-17264:
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User 'srowen' has created a pull request for this issue:
https://github.com/apache/spark/pull/14860
> DataStreamWriter should document that it only supports Parquet for now
> ----------------------------------------------------------------------
>
> Key: SPARK-17264
> URL: https://issues.apache.org/jira/browse/SPARK-17264
> Project: Spark
> Issue Type: Bug
> Components: Documentation, Input/Output
> Affects Versions: 2.0.0
> Environment: Mac OSX
> Reporter: Bill Reed
> Assignee: Sean Owen
> Priority: Trivial
>
> The API documentations for DataStreamWriter.format states "Specifies the
> underlying output data source. Built-in options include "parquet", "json",
> etc." but when specifying "json" or "text" for the format. the following
> exception is thrown:
> Exception in thread "main" java.lang.UnsupportedOperationException: Data
> source json does not support streamed writing
> at
> org.apache.spark.sql.execution.datasources.DataSource.createSink(DataSource.scala:273)
> at
> org.apache.spark.sql.streaming.DataStreamWriter.start(DataStreamWriter.scala:291)
> The only format that works is .format("parquet")
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