2021-12-25 08:32:51 +00:00
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# Downloader
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Is a service which does download and seed historical data.
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Historical data - is immutable, files have .seg extension.
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## Architecture
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2021-12-31 05:09:11 +00:00
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Downloader works based on <your_datadir>/snapshots/*.torrent files. Such files can be created 4 ways:
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- Erigon can do grpc call downloader.Download(list_of_hashes), it will trigger creation of .torrent files
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- Erigon can create new .seg file, Downloader will scan .seg file and create .torrent
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- operator can manually copy .torrent files (rsync from other server or restore from backup)
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- operator can manually copy .seg file, Downloader will scan .seg file and create .torrent
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2021-12-25 08:32:51 +00:00
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Erigon does:
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- connect to Downloader
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- share list of hashes (see https://github.com/ledgerwatch/erigon-snapshot )
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- wait for download of all snapshots
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- then switch to normal staged sync (which doesn't require connection to Downloader)
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Downloader does:
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2021-12-31 05:09:11 +00:00
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- Read .torrent files, download everything described by .torrent files
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- Use https://github.com/ngosang/trackerslist see [./trackers/embed.go](./trackers/embed.go)
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2021-12-25 08:32:51 +00:00
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- automatically seeding
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## How to
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### Start
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```
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downloader --datadir=<your_datadir> --downloader.api.addr=127.0.0.1:9093
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erigon --downloader.api.addr=127.0.0.1:9093 --experimental.snapshot
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```
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### Limit download/upload speed
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```
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downloader --download.limit=10mb --upload.limit=10mb
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```
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### Add hashes to https://github.com/ledgerwatch/erigon-snapshot
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```
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downloader print_torrent_files --datadir=<your_datadir>
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```
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2021-12-31 04:53:15 +00:00
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### Create new snapshots
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```
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rm <your_datadir>/snapshots/*.torrent
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erigon snapshots create --datadir=<your_datadir> --from=0 --segment.size=500_000
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```
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### Download snapshots to new server
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```
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rsync server1:<your_datadir>/snapshots/*.torrent server2:<your_datadir>/snapshots/
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// re-start downloader
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```
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