This Week in Fluvio #24

Welcome to This Week in Fluvio, our weekly newsletter for development updates to Fluvio open source. Fluvio is a distributed, programmable streaming platform written in Rust.

If you are producing a lot of data into Fluvio, you might be interested in keeping that data fresh for your consumers. Older data can be automatically pruned.

The default retention on new topics is 7 days with a default segment size of 1 GB. So any data residing in older 1 GB segments will be pruned 7 days after the last write. The current segment is left alone.

For a given topic with a retention of 7 days using 1 GB segments

• Day 0: 2.5 GB is written (total topic data: 2.5 GB)

Topic Segment # Segment size Days since last write

0 1 GB 0

1 1 GB 0

2 0.5 GB N/A

• Day 6: Another 2 GB is written (total topic data: 4.5 GB,)

Topic Segment # Segment size Days since last write

0 1 GB 6

1 1 GB 6

2 1 GB 0

3 1 GB 0

4 0.5 GB N/A

• Day 7: 2 segments from Day 0 are 7 days old. They are pruned (total topic data: 2.5 GB)

Topic Segment # Segment size Days since last write

2 1 GB 1

3 1 GB 1

4 0.5 GB N/A

• Day 14: 2 segments from Day 7 are 7 days old. They are pruned (total topic data: 0.5 GB)

Topic Segment # Segment size Days since last write

4 0.5 GB N/A

The newest segment is left alone and only begins to age once a new segment is being written to.

For more detail check out the docs for more about data retention in Fluvio

Get in touch with us on Github Discussions or join our Discord channel and come say hello!

For the full list of changes this week, be sure to check out our CHANGELOG.

Until next week!