GitHub user lw-lin opened a pull request:
https://github.com/apache/spark/pull/13575
[SPARK-15472][SQL] Add support for writing in `csv`, `json`, `text` formats
in Structured Streaming
## What changes were proposed in this pull request?
This patch adds support for writing in `csv`, `json`, `text` formats in
Structured Streaming:
**1. at a high level, this patch forms the following hierarchy**(`text` as
an example):
```
<OutputWriter>
â
TextOutputWriterBase
â â
BatchTextOutputWriter StreamingTextOutputWriter
```
```
<OutputWriterFactory>
â â
BatchTextOutputWriterFactory StreamingOutputWriterFactory
â
StreamingTextOutputWriterFactory
```
The `StreamingTextOutputWriter` and other 'streaming' output writers would
write data **without** using an `OutputCommitter`. This 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`**, which is slightly different from
[SPARK-14716](https://github.com/apache/spark/pull/12409). For example, if we
are writing out using the `gzip` compression and `FileStreamSink` assigns path
`${uuid}` to a text writer, then in the end the file written out will be
`${uuid}.txt.gz` -- so that when we read the file back, we'll correctly
interpret it as `gzip` compressed.
## How was this patch tested?
`FileStreamSinkSuite` is expanded much more to cover the added `csv`,
`json`, `text` formats:
```scala
test(" csv - unpartitioned data - codecs: none/gzip")
test("json - unpartitioned data - codecs: none/gzip")
test("text - unpartitioned data - codecs: none/gzip")
test(" csv - partitioned data - codecs: none/gzip")
test("json - partitioned data - codecs: none/gzip")
test("text - partitioned data - codecs: none/gzip")
test(" csv - unpartitioned writing and batch reading - codecs: none/gzip")
test("json - unpartitioned writing and batch reading - codecs: none/gzip")
test("text - unpartitioned writing and batch reading - codecs: none/gzip")
test(" csv - partitioned writing and batch reading - codecs: none/gzip")
test("json - partitioned writing and batch reading - codecs: none/gzip")
test("text - 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 add-csv-json-text-in-ss
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13575.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 #13575
----
commit c70083e9f76c20f6bf48e7ec821452f9bf63783a
Author: Liwei Lin <[email protected]>
Date: 2016-06-05T09:03:04Z
Add csv, json, text
commit bc28f4112ca9eca6a9f1602a891dd0388fa3185c
Author: Liwei Lin <[email protected]>
Date: 2016-06-09T03:31:59Z
Fix parquet extension
----
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