nautechsystems/nautilus_trader · error

Failed to sync pool events

Error message

Failed to sync pool events: {e}

What it means

In `analyze_pool_with_client`, the event-sync step (`sync_pool_events` equivalent call on the data client) fetches on-chain pool events from `from_block` up to the last checkpoint. Any error from that sync is wrapped with this message, keeping the original cause text.

Solutions

1. Read the inner error to distinguish transport vs. data issues.
2. Reduce the analyzed block range or supply more granular `--checkpoint-blocks`.
3. Use an archive/full node that covers `from_block` and allows large `eth_getLogs`.
4. Retry with backoff; the sync supports resuming from the last checkpoint on re-run.

Example fix

// before
nautilus blockchain analyze-pool ... --from-block 0
// after: start from deployment block or a closer checkpoint
nautilus blockchain analyze-pool ... --from-block 12345678 --checkpoint-blocks 12500000,13000000

loop {
    match sync_pool_events(...).await {
        Ok(_) => break,
        Err(e) if is_rate_limit_or_timeout(&e) => { backoff().await; continue; }
        Err(e) => return Err(anyhow::anyhow!("Failed to sync pool events: {e}")),
    }
}

When it happens

Trigger: Running pool analysis when the historical event sync fails — RPC timeouts/rate limits during large block ranges, `from_block` beyond the node's indexed history, corrupted checkpoint state, or network failure mid-sync.

Common situations: Free/public RPC endpoints rejecting deep `eth_getLogs` ranges; analyzing a pool over a huge block span without checkpoints; node pruning historic state.

Understand the failure class

Background: 'Something went wrong' / 'Request failed (500)' / 'HTTP error! status: 404' — what failed HTTP requests actually mean and how to find the real cause — this error's family across 28 libraries.

Related errors

• Failed to register DEX exchange
• Failed to sync blocks
• Failed to sync pools
• Pool state at block is ahead of the latest block ; the…
• Blockchain execution client is not connected

AI-assisted analysis of nautechsystems/nautilus_trader@18893faf8b (2026-09-08). Data as JSON: /api/errors/bb9ca7f6975f1c3c. Report an issue: GitHub.

Appendix: source

Thrown at crates/cli/src/blockchain/analyze.rs:308

        )]);
    }

    let last_checkpoint = checkpoints.last().copied().unwrap_or(first_checkpoint);

    if !snapshot_from_rpc {
        // Sync once up to the final checkpoint, honoring reset/from_block. Each checkpoint then
        // bootstraps incrementally from the previous checkpoint's snapshot, so one pass produces
        // every snapshot.
        data_client
            .sync_pool_events(
                &dex_type,
                pool_identifier,
                from_block,
                Some(last_checkpoint),
                reset,
            )
            .await
            .map_err(|e| anyhow::anyhow!("Failed to sync pool events: {e}"))?;
    }

    let pool = data_client
        .cache
        .get_pool(&pool_identifier)
        .ok_or_else(|| anyhow::anyhow!("Pool {pool_identifier} not found in cache"))?
        .clone();

    let mut outcomes = Vec::with_capacity(checkpoints.len());
    let mut rpc_profiler = None;

    for checkpoint in checkpoints {
        log::info!("Profiling pool {pool_identifier} to checkpoint block {checkpoint}");
        let (profiler, already_valid) = bootstrap_profiler_for_checkpoint(
            data_client,
            &pool,
            checkpoint,
            snapshot_from_rpc,

View on GitHub (pinned to 18893faf8b)