Frozen Pyjak (v1.9.4)

Geth v1.9.4 is a special maintenance release, that besides fixing issues as usual, also locks in the Istanbul hard fork block numbers for the Ropsten, Rinkeby and Görli test networks:

• Ropsten: 6485846, scheduled October 2, 2019 (ref).
• Rinkeby: 5435345, scheduled November 13, 2019 (ref).
• Görli: 1561651, scheduled October 30, 2019 (ref).

Please update your nodes on the above test networks before the deadlines, otherwise you will end up either on a wrong chain (Ropsten), or stuck altogether (Rinkeby and Görli). The --override.istanbul CLI flag can be used to bail out of the fork even last minute if things go sour.

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Improvements:

• Accumulate state writes post-Byzantium and only push into the trie at block end (#19953).
• Smarter locking in the transaction pool to avoid some contention (#20080, #20081, #20085).

Bugfixes:

• Fix a USB HID discovery regression on Windows (#20092).
• Various stability and balancing fixes for light servers (#20079).
• Fix some RLP decoding issues around nils for discv5 (#20064).
• Expose the GraphQL port (8547) from our docker images (#20033).
• Fix GraphQL UI serving regression caused by gzip encoding (#20046).
• Fix GraphQL address type decoding to reject invalid strings (#20046).
• Fix P2P metric types so they work properly with Influx/Grafana (#20047).

For a full rundown of the changes please consult the Geth 1.9.4 release milestone.

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As with all our previous releases, you can find the:

• Pre-built binaries for all platforms on our downloads page.
• Docker images published under ethereum/client-go.
• Ubuntu packages in our Launchpad PPA repository.
• OSX packages in our Homebrew Tap repository.