{"record":{"id":"856bb43263407c8d","repo":"nautechsystems/nautilus_trader","slug":"failed-to-sync-pools-e","errorCode":null,"errorMessage":"Failed to sync pools: {e}","messagePattern":"Failed to sync pools: (.+?)","errorType":"exception","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"crates/cli/src/blockchain/sync.rs","lineNumber":120,"sourceCode":"        .http_rpc_url(rpc_http_url.into())\n        .maybe_multicall_calls_per_rpc_request(multicall_calls_per_rpc_request)\n        .use_hypersync_for_live_data(true)\n        .postgres_cache_database_config(postgres_connect_options)\n        .build();\n    let cancellation_token = tokio_util::sync::CancellationToken::new();\n    let mut data_client = BlockchainDataClientCore::new(config, None, None, cancellation_token);\n    data_client.initialize_cache_database().await;\n\n    data_client.cache.initialize_chain().await;\n    data_client\n        .register_dex_exchange(dex_type)\n        .await\n        .map_err(|e| anyhow::anyhow!(\"Failed to register DEX exchange: {e}\"))?;\n    // We want to have full pool sync, so from 0 to last.\n    data_client\n        .sync_exchange_pools(&dex_type, 0, None, reset)\n        .await\n        .map_err(|e| anyhow::anyhow!(\"Failed to sync pools: {e}\"))?;\n\n    Ok(())\n}\n\npub(crate) async fn run_sync_blocks(\n    chain: String,\n    from_block: Option<u64>,\n    to_block: Option<u64>,\n    database: DatabaseConfig,\n) -> anyhow::Result<()> {\n    let chain = Chain::from_chain_name(&chain)\n        .ok_or_else(|| anyhow::anyhow!(\"Invalid chain name: {chain}\"))?;\n    let chain = Arc::new(chain.to_owned());\n    let from_block = from_block.unwrap_or(0);\n\n    let postgres_connect_options = get_postgres_connect_options(\n        database.host,\n        database.port,","sourceCodeStart":102,"sourceCodeEnd":138,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/cli/src/blockchain/sync.rs#L102-L138","documentation":"Wraps errors from `data_client.sync_exchange_pools(&dex_type, 0, None, reset)` after the DEX exchange was successfully registered in `run_sync_dex`. Pool sync walks on-chain factory/pool events from block 0 to the latest block through the node RPC, so RPC failures, reorg-related errors, or client-side database write failures are reported here. The CLI aborts the command.","triggerScenarios":"Running `nautilus blockchain sync dex` when the node RPC drops mid-backfill, the block range 0..latest is too large for the provider's limits, the chain is reorganizing, or writing pools to the cache database fails.","commonSituations":"Long initial full-history sync against public rate-limited RPC endpoints (Infura/Alchemy free tier); local node pruning historical state; Postgres down or connection pool exhausted during a long sync; network interruption during a multi-hour backfill.","solutions":["Retry the command; the sync is resumable/resettable — use the reset flag only if data is inconsistent.","Switch to a paid/dedicated or local archive node to avoid rate limiting and pruned-state errors during the 0-to-latest backfill.","Check Postgres/cache database connectivity and disk space; a long sync can fail on DB write errors.","Sync a smaller block range (or a single DEX) first to isolate whether the failure is RPC- or data-related.","Inspect the inner `{e}` message with debug logging to target the actual failing call."],"exampleFix":null,"handlingStrategy":"retry","validationCode":"// check DB reachability and node height before syncing\nlet height = eth_client.block_number().await?;\nlet pg = sqlx::postgres::PgPool::connect(&db_url).await?;\nprintln!(\"node at block {height}, db ok\");","typeGuard":null,"tryCatchPattern":"loop {\n    match data_client.sync_exchange_pools(&dex_type, from, None, reset).await {\n        Ok(()) => break,\n        Err(e) if is_transient(&e) => { backoff().await; continue; }\n        Err(e) => { eprintln!(\"pool sync failed permanently: {e:#}\"); break; }\n    }\n}","preventionTips":["Use archive/dedicated RPC endpoints for full-history pool backfills.","Sync in block-range chunks so failures resume from a known point.","Monitor DB connections/disk during long syncs.","Avoid resetting cache unless data is known inconsistent.","Rate-limit RPC calls to stay under provider quotas."],"tags":["cli","blockchain","network","rpc","database"],"backgroundTag":"network-request-failed","analyzedSha":"18893faf8b356be3320add8de2f861b0b647cf06","analyzedAt":"2026-09-08T20:49:34.690Z","contentChangedAt":"2026-09-08T20:49:34.690Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}