GitHub user lw-lin opened a pull request: https://github.com/apache/spark/pull/13705
[SPARK-15472][SQL] Add support for writing in `csv` format in Structured Streaming ## What changes were proposed in this pull request? This patch adds support for writing in `csv` format in Structured Streaming: **1. At a high level, this patch forms the following class hierarchy**: ``` <OutputWriter> â CSVOutputWriterBase â â (anonymous batch) CSVOutputWriter (anonymous streaming) CSVOutputWriter [write data without using an OutputCommitter] ``` ``` <OutputWriterFactory> â â BatchCSVOutputWriterFactory StreamingCSVOutputWriterFactory ``` The streaming CSVOutputWriter would write data **without** using an `OutputCommitter`, which was the same approach taken by [SPARK-14716](https://github.com/apache/spark/pull/12409). **2. To support compression, this patch attaches an extension to the path assigned by `FileStreamSink`**. E.g., if we write out using the `gzip` compression and `FileStreamSink` assigns path `${uuid}` to the output writer, then in the end the file written out will be `${uuid}.csv.gz`. This way when we read the file back, we should be able to interpret it correctly as `gzip` compressed. This is slightly different from [SPARK-14716](https://github.com/apache/spark/pull/12409). ## How was this patch tested? `FileStreamSinkSuite` is expanded to cover `csv` format: ```scala test("csv - unpartitioned data - codecs: none/gzip") test("csv - partitioned data - codecs: none/gzip") test("csv - unpartitioned writing and batch reading - codecs: none/gzip") test("csv - partitioned writing and batch reading - codecs: none/gzip") ``` You can merge this pull request into a Git repository by running: $ git pull https://github.com/lw-lin/spark csv-for-ss Alternatively you can review and apply these changes as the patch at: https://github.com/apache/spark/pull/13705.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #13705 ---- commit 9869f9885e4fdc7364cd46ab05b1f332921ff8d7 Author: Liwei Lin <lwl...@gmail.com> Date: 2016-06-16T05:38:13Z Add support for writing in `csv` format ---- --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org