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update README

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i-norden 2021-11-18 18:10:50 -06:00
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@ -104,6 +104,13 @@ e.g.
./build/bin/geth --syncmode=full --gcmode=archive --statediff --statediff.writing --statediff.db.type=postgres --statediff.db.driver=sqlx --statediff.db.host=localhost --statediff.db.port=5432 --statediff.db.name=vulcanize_test --statediff.db.user=postgres --statediff.db.nodeid=nodeid --statediff.db.clientname=clientname
`
When operating in `--statediff.db.type=file` mode, the service will write SQL statements out to the file designated by
`--statediff.file.path`. Please note that it writes out SQL statements with all `ON CONFLICT` constraint checks dropped.
This is done so that we can scale out the production of the SQL statements horizontally, merge the separate SQL files produced,
de-duplicate using unix tools (`sort statediff.sql | uniq` or `sort -u statediff.sql`), bulk load using psql
(`psql db_name --set ON_ERROR_STOP=on -f statediff.sql`), and then add our primary and foreign key constraints and indexes
back afterwards.
### RPC endpoints
The state diffing service exposes both a WS subscription endpoint, and a number of HTTP unary endpoints.