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Upgrade

ℹ️info

Terra's upgrade module inherits from the Cosmos SDK's upgrade module. This document is a stub and mainly covers important Terra-specific notes on how it is used.

The upgrade module allows live chains to be upgraded with breaking changes smoothly.

State​

The upgrade module is relatively straightforward:


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The state contains the currently active upgrade Plan (if one exists) by key 0x0 and if a Plan is marked as "done" by key 0x1.
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The state contains the consensus versions of all app modules in the application.
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The versions are stored as big endian uint64 and can be accessed with prefix 0x2 appended by the corresponding module name of type string.
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The state maintains a Protocol Version which can be accessed by key 0x3.
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Plan: 0x0 -> Plan
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Done: 0x1 | byte(plan name) -> BigEndian(Block Height)
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ConsensusVersion: 0x2 | byte(module name) -> BigEndian(Module Consensus Version)
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ProtocolVersion: 0x3 -> BigEndian(Protocol Version)