S3st: Stream data from multiple S3 objects directly into your terminal

https://www.npmjs.com/package/s3st

by loige • 7 years ago

61 19 7 years ago

npmjs.com

sdan• 7 years ago

What are the potential use cases?

loige5• 7 years ago

There's one in the example (streaming from multiple cloudtrail files and grepping on the resulting stream)

saimiam2• 7 years ago

Pretty neat. I'm working on a product that relies heavily on S3 buckets and tagged files.

Does s3st support tags or other ways of identifying which files to stream other than filtering by the content of the files? Asking because I didn't see this feature in the demo.

loige5• 7 years ago

It doesn't. It only supports a prefix to filter out objects. I am happy to get PRs for this kind of features if you have a use case!

saimiam2• 7 years ago

Copy that. I’ll take a look.

empthought• 7 years ago

What are the advantages of this over a shell pipeline with aws-cli?

rsync• 7 years ago

Or, what is the advantage over mounting the s3 bucket as a local filesystem with s3fs[1] or rclone mount[2] ?

[1] https://github.com/s3fs-fuse/s3fs-fuse

[2] https://rclone.org/commands/rclone_mount/

jorblumesea• 7 years ago

If your s3 bucket is huge, that's probably not a good idea. Most likely, the use case here is streaming and search for tagged data within a very large s3 dataset.

geraldcombs• 7 years ago

...or MinIO's mc (which is a single executable)?

alainchabat• 7 years ago

We have a large s3 bucket 2 billions objects and we start thinking about cleaning it a bit. Is anyone had done such things or any tools on :

- categorising what's inside

- checking what's used or not

Thanks!

ben509• 7 years ago

The first step would be figuring out what's in there, so maybe look at Glue[1] and see if it can determine your existing schema.

But usually you need to run run arbitrary code against the contents of a large S3 bucket, and that gets tricky. The main problem is tracking what you've done vs. what you need to do, because if you haven't categorized your data yet, you can expect that code processing it will break.

One technique is queues in SQS:

1. Keys to process

2. Keys that succeeded

3. Keys that failed

(Regular queues, FIFO queues probably won't be useful. A queue can have an unlimited backlog, but the maximum message timeout is two weeks. That's probably more than enough time to iterate over some code in Lambda.)

Your initial lambda should be triggered by KeysToProcess, which you can initiate off a developer machine and just run ListBucket and create a pile of messages.

When the lambda is done, it passes its information to KeysThatSucceeded. (Or possibly another S3 bucket, or Dynamo, or a database, or just drop its key if you determine you don't need it.)

Point your dead letter queue to KeysThatFailed. Let the messages pile up in there until you've figured out the errors and are ready to try again.

And then you can trigger off KeysThatFailed, point the dead letter queue at a new KeysThatFailed2, rinse, repeat until you're satisfied it's correct.

[1] https://aws.amazon.com/glue/

mcqueenjordan• 7 years ago

https://docs.aws.amazon.com/AmazonS3/latest/dev/storage-inve...

S3 Inventory is basically designed for your use case. It effectively writes a full-bucket index every day.

Reedx• 7 years ago

Relatedly, I'm curious how people are handling local backups with large S3 buckets?

I've been using AWS CLI sync, but it's getting increasingly slow. To the point that it seems untenable.

aliencat• 7 years ago

You can also acomplish this with shell:

export BUCKET=____; aws s3 ls "$BUCKET" | tail -n+2 | awk '{print $4}' | while read k; do aws s3 cp "s3://$BUCKET/$k" -; done

loige5• 7 years ago

I especially like the "done" (!) at end :) Thanks for this one-liner!

tbrock• 7 years ago

Cool. I had a similar use case and created a tool to stream colorized logs from CloudWatch to your terminal that is a little more ergonomic to use than this:

https://github.com/TylerBrock/saw

loige5• 7 years ago

I didn't know saw! It looks very very cool, and it's written in go! Thanks for (making and) sharing this!

djhworld• 7 years ago

One thing to be careful of with this is the Data Transfer (egress) cost you will incur streaming data out from S3.

If you're just wanting to do a 'grep' style action on an S3 prefix, might be worth looking into "S3 Select"for your use case instead

loige5• 7 years ago

Very good point, this is probably worth mentioning in the README. I'll add a note there for sure!

S3st: Stream data from multiple S3 objects directly into your terminal

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