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Mirrors a Kinesis stream to Amazon S3 using the KCL
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Snowplow S3 Loader

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The Snowplow S3 Loader consumes records from an Amazon Kinesis stream or NSQ topic, and writes them to S3.

There are 2 file formats supported:

  • LZO
  • GZip


The records are treated as raw byte arrays. Elephant Bird's BinaryBlockWriter class is used to serialize them as a Protocol Buffers array (so it is clear where one record ends and the next begins) before compressing them.

The compression process generates both compressed .lzo files and small .lzo.index files (splittable LZO). Each index file contain the byte offsets of the LZO blocks in the corresponding compressed file, meaning that the blocks can be processed in parallel.


The records are treated as byte arrays containing UTF-8 encoded strings (whether CSV, JSON or TSV). New lines are used to separate records written to a file. This format can be used with the Snowplow Kinesis Enriched stream, among other streams.


Assuming git, Vagrant and VirtualBox installed:

 host$ git clone
 host$ cd snowplow-s3-loader
 host$ vagrant up && vagrant ssh
guest$ cd /vagrant
guest$ sbt test


You must have lzop and lzop-dev installed. In Ubuntu, install them like this:

host$ sudo apt-get install lzop liblzo2-dev

NOTE: These are already installed in the Vagrant quickstart environment.

Command Line Interface

The Snowplow S3 Loader has the following command-line interface:

snowplow-s3-loader: Version 0.6.0

Usage: snowplow-s3-loader [options]

--config <filename>


Create your own config file:

guest$ cd /vagrant
guest$ cp examples/config.hocon.sample my.conf

You will need to edit all fields in the config. Consult this portion of the setup guide on how to fill in the fields.

Next, start the sink, making sure to specify your new config file:

guest$ java -jar snowplow-s3-loader-0.6.0.jar --config my.conf

Find out more

Technical Docs Setup Guide Roadmap & Contributing
i1 i2 i3
Technical Docs Setup Guide coming soon

Copyright and license

Snowplow S3 Loader is copyright 2014-2017 Snowplow Analytics Ltd.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this software except in compliance with the License.

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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