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Overview

See State Sync from External Storage for a description of how to configure your node to sync State from an arbitrary external location.

Pagoda provides state dumps for every shard of every epoch since the release of 1.36.0-rc.1 for testnet and 1.36.0 for mainnet.

Enable State Sync​

The main option you need is state_sync_enabled, and then specify how to get the state parts provided by Pagoda in the option state_sync.

The following snippet is included in the reference config.json file and provides access to the state of every shard every epoch:

"state_sync_enabled": true,
"state_sync": {
  "sync": {
    "ExternalStorage": {
      "location": {
        "GCS": {
          "bucket": "state-parts",
        }
      },
      "num_concurrent_requests": 4,
      "num_concurrent_requests_during_catchup": 4,
    }
  }
}

Reference config.json file​

Run the following command to download the reference config.json file:

./neard --home /tmp/ init --download-genesis --download-config --chain-id <testnet or mainnet>

The file will be available at /tmp/config.json.

Troubleshooting​

If you notice that your node runs state sync and it hasn't completed after 3 hours, please check the following:

  1. Config options related to the state sync in your config.json file:
  • state_sync_enabled
  • state_sync
  • consensus.state_sync_timeout
  • tracked_shards
  • tracked_accounts
  • tracked_shard_schedule
  • archive
  • block_fetch_horizon

The best way to see the exact config values used is to visit a debug page of your node: http://127.0.0.1:3030/debug/client_config

Check whether state sync is enabled, and check whether it's configured to get state parts from the right location mentioned above.

  1. Has your node ran out of available disk space?

If all seems to be configured fine, then disable state sync (set "state_sync_enabled": false in config.json) and try again. If that doesn't help, then restart from a backup data snapshot.

Running a Chunk-Only Producer that tracks a single shard​

Enable State Sync as explained above.

And then configure the node to track no shards:

"tracked_shards": [],
"tracked_accounts": [],
"tracked_shard_schedule": [],

It is counter-intuitive but it works. If a node stakes and is accepted as a validator, then it will track the shard that it needs to track to fulfill its validator role. The assignment of validators to shards is done by the consensus of validators.

Note that in different epochs a validator may be assigned to different shards. A node switches tracked shards by using the State Sync mechanism for a single shard. See catchup.