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Backport writing new fields to snapshot#26394
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steviez merged 2 commits intosolana-labs:v1.10from Jul 7, 2022
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@AshwinSekar - Is there any reason we can't include the field in newly serialized snapshots in |
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The reason this wasn't backported was because of this previous work #24074 that @jeffwashington backported. If we don't backport the serialization for that field then we can't serialize this one because it will get deserialized as part of the accounts db field. |
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Serializing and storing lamports_per_signature field is critical to avoid issues when a snapshot is taken at a slot with a non-default lamports_per_signature value. In order to keep compatibility between v1.10 and newer snapshots, we also need to serialize default values for several AccountsDB fields.
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Problem
#23844 and #25364 added new fields to be serialized in snapshots. Partial backports to v1.10 were added to allow a v1.10 client to consume snapshots produced by newer clients that contain these fields.
However, we also need the
lamports_per_signaturevalue to be stored in snapshots. If this value isn't stored, we could run into issues when restarting from a snapshot that was taken at a slot where thelamports_per_signaturevalue was non-default. If the value isn't stored, we're forced to use the default on restart. If we use the default instead of what the proper value should have been, we deviate from consensus immediately. See #26069 for more info about how we debugged this.Summary of Changes
Make v1.10 serialize new fields (default for accountsdb / proper value for lamports_per_signature) into snapshots.
Fixes #26069
Testing
To test the change, I did the following with the slots that were failing in GH 26069:
solana-ledger-tool verifyfrom the new snapshot