Feature request: ipfs-cluster-service that acts as consensus arbiter

[etam]

Describe the feature you are proposing

Allow to run a ipfs-cluster-service, that

• Is part of the cluster and runs the "consensus component"
• Doesn't take part in pinning the data and doesn't need an ipfs node running

Why:

• Running additional raft nodes allows for better resilience against failures
• An arbiter could be run on small devices (like Raspberry Pi), which are too small for ipfs node.

Additional context

https://docs.gluster.org/en/latest/Administrator-Guide/Split-brain-and-ways-to-deal-with-it/#2-arbiter-volume

[welcome]

Thank you for submitting your first issue to this repository! A maintainer will be here shortly to triage and review.
In the meantime, please double-check that you have provided all the necessary information to make this process easy! Any information that can help save additional round trips is useful! We currently aim to give initial feedback within two business days. If this does not happen, feel free to leave a comment.
Please keep an eye on how this issue will be labeled, as labels give an overview of priorities, assignments and additional actions requested by the maintainers:

• "Priority" labels will show how urgent this is for the team.
• "Status" labels will show if this is ready to be worked on, blocked, or in progress.
• "Need" labels will indicate if additional input or analysis is required.

Finally, remember to use https://discuss.ipfs.io if you just need general support.

[lanzafame]

Doesn't take part in pinning the data and doesn't need an ipfs node running

Currently, the pintracker component actually uses the underlying IPFS node as storage for pinset metadata, so this isn't possible.

A possible option, and I will ask that @hsanjuan confirm this is will work, is that you could run a node that has a really small IPFS RepoSize, just make sure that it is bigger than the predicted size of the pinset. This way the node will always be last in the list of nodes suggested by the informer for pinning the files to. This requires that the informer uses the disk freespace configuration.

JFYI, you can comfortably run IPFS and IPFS Cluster on a Raspberry Pi.

[hsanjuan]

A dummy IPFSConnector component that does nothing on pin/unpin and reports 0 size available would do, I think.