What causes "Failed to sync pool events: {e}" in nautechsystems/nautilus_trader?

Read the inner error to distinguish transport vs. data issues.

Failed to sync pool events: {e}

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.

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)

Solutions

Read the inner error to distinguish transport vs. data issues.
Reduce the analyzed block range or supply more granular `--checkpoint-blocks`.
Use an archive/full node that covers `from_block` and allows large `eth_getLogs`.
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

Defensive patterns

Strategy: retry

Try / catch

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}")),
    }
}

Prevention

Split large ranges with checkpoint blocks.
Use an archive node supporting deep eth_getLogs.
Add exponential backoff for transport errors.

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

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