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Updated on April 12, 2021

Upgrade to GoQuorum 2.6.0

GoQuorum 2.6.0 upgrades the base geth version from 1.8.18 to 1.9.7 See Ethereum 1.9.0 for the complete list if new features added as a part of geth 1.9.7.


geth 1.9.7 has several enhancements at the database layer which are part of GoQuorum 2.6.0. Hence, once migrates to 2.6.0, it cannot rollback to older version of Quorum. The recommendation is to keep the back of the data directory before upgrading to 2.6.0 which can be used to revert back to older version if necessary.

A node running on GoQuorum 2.6.0 can coexist on a network where other nodes are running on lower version of GoQuorum and thus supports node by node upgrade to GoQuorum 2.6.0. The suggested upgrade process is as described below:

  • Bring down the node which needs to be upgraded to GoQuorum 2.6.0. Modify the genesis.json file to include istanbulBlock and petersburgBlock. The values for this should be set to an appropriate value in future by when the entire network would have upgraded to GoQuorum 2.6.0. This is important as the gas calculation logic has changed in geth 1.9.7. Not setting this value properly can result in Bad block error

  • GoQuorum 2.6.0 has deprecated genesis attributes maxCodeSize and maxCodeSizeChangeBlock. To allow tracking of multiple maxCodeSize value changes, a new attribute maxCodeSizeConfig is added to genesis. If the maxCodeSize was changed multiple times, it could result in Bad block error for any new node joining the network. The changes in GoQuorum 2.6.0 address this and enable tracking of historical changes of maxCodeSize in genesis and thus allow it to be changed multiple times in network life. With this change when init is executed in GoQuorum 2.6.0, geth will force usage of maxCodeSizeConfig.


    "config": {
        "homesteadBlock": 0,
        "byzantiumBlock": 0,
        "constantinopleBlock": 0,
        "petersburgBlock": 0,
        "istanbulBlock": 0,
        "chainId": 10,
        "eip150Block": 0,
        "eip155Block": 0,
        "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "eip158Block": 0,
        "isQuorum": true,
        "maxCodeSizeConfig": [
            "block": 5,
            "size": 35
            "block": 15,
            "size": 24
            "block": 20,
            "size": 35
  • Execute geth --datadir path/to/datadir init genesis.json with the modified genesis.json

  • Bring up the node in GoQuorum 2.6.0


  • freezerdb - geth 1.9.7 introduces the feature of freezerdb where block data beyond a certain threshold is moved to a different file-based storage area. The location for freezerdb can be provided by the geth command line option:

    --datadir.ancient <value> - Data directory for ancient chain segments (default = inside chaindata)

  • When a node is migrated to this version, geth by default will create the ancient data folder and start moving blocks below the immutability threshold (default: 3162240) into the ancient data.

    If you do not want this movement to happen, use [--immutabilitythreshold](../../Reference/] to set the immutability threshold to an appropriate value when starting geth.

  • geth 1.9.7 by default does not allow keystore-based accounts to be unlocked in the startup process. geth will crash if the unlock is attempted as a part of startup. To enable account unlocking, use --allow-insecure-unlock:

    --allow-insecure-unlock - Allow insecure account unlocking when account-related RPCs are exposed by http.

  • Failure to sync up - GoQuorum 2.6.0 can fail to sync up with missing parent error under the following scenario: In a GoQuorum network running with gcmode=full and block height exceeding immutability threshold (with blocks in freezerdb), if a node is restarted non-gracefully (kill -9/docker kill & start) then it can fail to sync up with its peers with missing parent error.

    This is due to an upstream bug where non-graceful restart causes gap between leveldb and freezerdb.

    This can be avoided by either running the node with gcmode=archive or restarting the node gracefully (kill / docker stop & start).

    This has been fixed in GoQuorum v21.4.0 (from upstream geth 1.9.20).

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