out_s3: Add a description for pure C parquet

pipeline/outputs/s3.md

@@ -6,7 +6,7 @@ description: Send logs, data, and metrics to Amazon S3
 
 ![AWS logo](<../../.gitbook/assets/image (9).png>)
 
-The _Amazon S3_ output plugin lets you ingest records into the [S3](https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/WhatIsCloudWatchLogs.html) cloud object store.
+The _Amazon S3_ output plugin lets you ingest records into the [S3](https://docs.aws.amazon.com/AmazonS3/latest/userguide/Welcome.html) cloud object store.
 
 The plugin can upload data to S3 using the [multipart upload API](https://docs.aws.amazon.com/AmazonS3/latest/dev/uploadobjusingmpu.html) or [`PutObject`](https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObject.html). Multipart is the default and is recommended. Fluent Bit will stream data in a series of _parts_. This limits the amount of data buffered on disk at any point in time. By default, every time 5&nbsp;MiB of data have been received, a new part will be uploaded. The plugin can create files up to gigabytes in size from many small chunks or parts using the multipart API. All aspects of the upload process are configurable.
 
@@ -45,7 +45,8 @@ The [Prometheus success/retry/error metrics values](../../administration/monitor
 | `sts_endpoint` | Custom endpoint for the STS API. | _none_ |
 | `profile`   | Option to specify an AWS Profile for credentials.   | `default` |
 | `canned_acl` | [Predefined Canned ACL policy](https://docs.aws.amazon.com/AmazonS3/latest/dev/acl-overview.html#canned-acl) for S3 objects. | _none_ |
-| `compression` | Compression type for S3 objects. `gzip` is currently the only supported value by default. If Apache Arrow support was enabled at compile time, you can use `arrow`. For gzip compression, the Content-Encoding HTTP Header will be set to `gzip`. Gzip compression can be enabled when `use_put_object` is `on` or `off` (`PutObject` and Multipart). Arrow compression can only be enabled with `use_put_object On`. | _none_ |
+| `compression` | Compression/format for S3 objects. Supported: `gzip` (always available) and `parquet` (requires Arrow build). For `gzip`, the `Content-Encoding` header is set to `gzip`. `parquet` is available _only when Fluent Bit is built with `-DFLB_ARROW=On`_ and Arrow GLib/Parquet GLib are installed. Parquet is typically used with `use_put_object On`. | _none_  |
+
 | `content_type` | A standard MIME type for the S3 object, set as the Content-Type HTTP header. | _none_ |
 | `send_content_md5` | Send the Content-MD5 header with `PutObject` and UploadPart requests, as is required when Object Lock is enabled. | `false` |
 | `auto_retry_requests` | Immediately retry failed requests to AWS services once. This option doesn't affect the normal Fluent Bit retry mechanism with backoff. Instead, it enables an immediate retry with no delay for networking errors, which can help improve throughput during transient network issues. | `true` |
@@ -649,3 +650,56 @@ The following example uses `pyarrow` to analyze the uploaded data:
 3  2021-04-27T09:33:56.539430Z    0.0     0.0       0.0         0.0          0.0            0.0
 4  2021-04-27T09:33:57.539803Z    0.0     0.0       0.0         0.0          0.0            0.0
 ```
+
+## Enable Parquet support
+
+### Build requirements for Parquet
+
+To enable Parquet, build Fluent Bit with Apache Arrow support and install Arrow GLib/Parquet GLib:
+
+```bash
+# Ubuntu/Debian example
+sudo apt-get update
+sudo apt-get install -y -V ca-certificates lsb-release wget
+wget https://packages.apache.org/artifactory/arrow/$(lsb_release --id --short | tr 'A-Z' 'a-z')/apache-arrow-apt-source-latest-$(lsb_release --codename --short).deb
+sudo apt-get install -y -V ./apache-arrow-apt-source-latest-$(lsb_release --codename --short).deb
+sudo apt-get update
+sudo apt-get install -y -V libarrow-glib-dev libparquet-glib-dev
+
+# Build Fluent Bit with Arrow:
+cd build/
+cmake -DFLB_ARROW=On ..
+cmake --build .
+```
+
+For other Linux distributions, refer [the document for installation instructions of Apache Parquet](https://arrow.apache.org/install/).
+Apache Parquet GLib is a part of Apache Arrow project.
+
+### Testing Parquet compression
+
+## Testing (Parquet)
+
+Example configuration:
+
+```yaml
+service:
+    flush: 5
+    daemon: Off
+    log_level: debug
+    http_server:  Off
+
+pipeline:
+  inputs:
+    - name:  dummy
+      tag:   dummy.local
+      dummy {"boolean": false, "int": 1, "long": 1, "float": 1.1, "double": 1.1, "bytes": "foo", "string": "foo"}
+
+  outputs:
+    - name: s3
+      match:           dummy*
+      region:          us-east-2
+      bucket:          <your_testing_bucket>
+      use_put_object:  On
+      compression:     parquet
+      # other parameters
+```