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49 lines
2.1 KiB
Markdown
49 lines
2.1 KiB
Markdown
---
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title: WAKU-STORE-SYNC
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name: Waku Store Synchronization
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editor: Simon-Pierre Vivier <simvivier@status.im>
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contributors:
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---
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## Abstract
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This document describe the strategy Waku Store node will employ to stay synchronized.
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The goal being that all store nodes eventually archive the same set of messages.
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## Background / Rationale / Motivation
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Message propagation in the network is not perfect,
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even with GossipSub mechanisms to detect missed messages.
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Nodes can also go offline for various reason outside our control.
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Store nodes that want to provide a good service must be able to remedy situations like these.
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By having store nodes synchronize with each other through various protocols,
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the set of archived messages network wide will be eventually consistent.
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## Theory / Semantics
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The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “NOT RECOMMENDED”, “MAY”, and “OPTIONAL” in this document are to be interpreted as described in [RFC 2119](https://www.ietf.org/rfc/rfc2119.txt).
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Various protocols and features that help with message consistency are described below.
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### Store Resume
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This feature allow a node to fill the gap in messages for the period it was last offline.
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At startup, a node SHOULD use the Store protocol to query a random node for
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the time interval since it was last online.
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Messages returned by the query are then added to the local node storage.
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It is RECOMMENDED to limit the time interval to a maximum of 6 hours.
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### Waku Sync
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Nodes that stay online can still miss messages.
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[Waku Sync](https://github.com/waku-org/specs/blob/master/standards/core/sync.md) is 2 libp2p protocols used to find those messages and mend the differences by periodically syncing with random nodes.
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It is RECOMMENDED to trigger a sync with a random peer that supports the protocols every 5 minutes for a time range of the last hour.
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## Copyright
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Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).
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## References
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- [Waku Sync](https://github.com/waku-org/specs/blob/master/standards/core/sync.md) |