List all graph node env variables for hedera

[mshakeg]

Problem

Hedera isn't supported by The Graph's hosted service, so developers looking to deploy their subgraphs will have to setup their own graph node. The subgraph-example doesn't list the graph node's env variables optimised for hedera. It would be helpful to anyone looking to set up a graph node to use that list of env variables instead of using their own guesses or the default values.

For example ETHEREUM_POLLING_INTERVAL defaults to 500ms, however looking at hashscan's blocks the block time seems to be about 2000ms and looking at hedera metrics the time to finality is ~5.45s so perhaps a more suitable ETHEREUM_POLLING_INTERVAL is between 6_000 - 10_000 ms.

Another example would be the GRAPH_ETHEREUM_BLOCK_INGESTOR_MAX_CONCURRENT_JSON_RPC_CALLS_FOR_TXN_RECEIPTS variable which defaults to 1_000, however, should probably be based on the relay service limits which in the case of Arkhia's Enterprise tier should be 200.

Solution

• List all the graph node's environment variables optimised for Hedera in the subgraph-example

Alternatives

No response

[dimitrovmaksim]

This may take some time to figure out, probably after other issues are resolved and the whole thin is stable and can be tested extendedly.

[AlfredoG87]

even when in the docs says that this value defaults to 1000, i've seen is variable, and Hedera-Json-RPC-Relay does have a 1000 limit that in case it receives a higher block range it returns an error.

GRAPH_ETHEREUM_MAX_BLOCK_RANGE_SIZE=1000

[mshakeg]

@AlfredoG87 I recall going through the code a while back and it scales up/down based on failed calls, so GRAPH_ETHEREUM_MAX_BLOCK_RANGE_SIZE is just the MAX number of blocks it'll try to get concurrently, not sure what the limit is on hashio, but you'd want GRAPH_ETHEREUM_MAX_BLOCK_RANGE_SIZE to correspond with that limit or probably less since it's not a private dedicated relay.

[AlfredoG87]

Indeed the graph-node does scale up and down, but for the times it goes up, it fails.
yeah, the max on the relay is 1000, so this variable (GRAPH_ETHEREUM_MAX_BLOCK_RANGE_SIZE )should be 1000 or less.

[Nana-EC]

@AlfredoG87 let's update https://github.com/hashgraph/hedera-json-rpc-relay/tree/main/tools/subgraph-example#prerequisites section with any custom graph env variables for optimized ingestion.