Standalone node MPS DB Upgrade

[nicolae-leonte-go]

Introduction

Since the release of the multiple private states feature the only way to switch from a standalone node to an MPS enabled configuration was to do a full node resync. This feature introduces a new geth command that allows a more expedient upgrade.

MPS DB Upgrade Command

MPS can be enabled on a standalone node by executing the mpsdbupgrade command. It should be significantly faster than a normal sync from block 0 (especially if the network has reached a significant number of blocks).
The effect of the mpsdbupgrade command is to restructure/upgrade the existing database to present itself as an MPS enabled database with a single private state (and to set the chain config.isMPS to true).
Once the upgrade completes additional private states can be introduced but only from the current block height (you can't introduce private states at historic block heights).

Command parameters:

• --datadir - the directory containing the GoQuorum node database

Example:

$ geth mpsdbupgrade --datadir data
Processing block 1 with hash 0xf668e8b8320040a0cabd1b6ec963a79a08536409d82b9ccaa31f62b0a1a4dc10
...
Processing block 1232739 with hash 0x2423b5d0f4c2883172f657f08d7d359b81f144b8cb8393ee24ef285058d55ce8
MPS DB upgrade finished successfully.

Related PRs

Docs: Consensys/doc.goquorum#109
QAT: Consensys/quorum-acceptance-tests#134