GitHub user lw-lin opened a pull request:
https://github.com/apache/spark/pull/13518
[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`.** 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 much more expanded to cover the added `csv`,
`json`, `text` format:
```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-for-ss
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13518.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 #13518
----
commit 97034f9aeb092b10e1606e60a8e6b4878ebd54cf
Author: Liwei Lin <[email protected]>
Date: 2016-06-05T09:03:04Z
Add csv, json, text
commit 2035b597b44aa519d8da3b155036446f88b3050e
Author: Liwei Lin <[email protected]>
Date: 2016-06-05T09:03:15Z
Fix parquet extension
----
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