[Orphaned Kinesis Shards] Shards got stuck and are not processing any data

Question

Yesterday we saw an event that couple of `Shards` in our Kinesis data streams were not processed at all.

## Setup

We have a kinesis stream and we have a fargate service which is consuming the records from kinesis shards.

### We have total 16 shards and 16 ECS tasks consuming from these shards.

### What could be the possible root causes for stuck shards? What all things we should lookout for to debug this as we are seeing this issue continuously

Giovanni Lauria · Answer

There are a lot of causes leading to this

Look at this doc page that elaborates some:
https://docs.aws.amazon.com/streams/latest/dev/troubleshooting-consumers.html

[Orphaned Kinesis Shards] Shards got stuck and are not processing any data

Setup

We have total 16 shards and 16 ECS tasks consuming from these shards.

What could be the possible root causes for stuck shards? What all things we should lookout for to debug this as we are seeing this issue continuously

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