D4Vinci/Scrapling · error · TimeoutError

No pages finished to clear place in the pool within the {sel

Error message

No pages finished to clear place in the pool within the {self._max_wait_for_page}s timeout period

What it means

Raised in `_get_page` of the sync browser engine base (scrapling/engines/_browsers/_base.py:298). With a persistent browser context, pages are pooled up to `max_pages`; when the pool is full, this code waits (polling every 50ms) up to `_max_wait_for_page` (hardcoded 60s) for a busy page to finish and be released. If none frees up in time, a `TimeoutError` is raised because `ctx.new_page()` would otherwise exceed the cap.

Source

Thrown at scrapling/engines/_browsers/_base.py:298

        blocked_domains: Optional[Set[str]] = None,
        context: Optional[AsyncBrowserContext] = None,
    ) -> PageInfo[AsyncPage]:  # pragma: no cover
        """Get a new page to use"""
        ctx = context if context is not None else self.context
        if TYPE_CHECKING:
            assert ctx is not None, "Browser context not initialized"

        async with self._lock:
            # If we're at max capacity after cleanup, wait for busy pages to finish
            if context is None and self.page_pool.pages_count >= self.max_pages:
                # Only applies when using persistent context
                start_time = time()
                while time() - start_time < self._max_wait_for_page:
                    await asyncio_sleep(0.05)
                    if self.page_pool.pages_count < self.max_pages:
                        break
                else:
                    raise TimeoutError(
                        f"No pages finished to clear place in the pool within the {self._max_wait_for_page}s timeout period"
                    )

            page = await ctx.new_page()
            page.set_default_navigation_timeout(timeout)
            page.set_default_timeout(timeout)
            if extra_headers:
                await page.set_extra_http_headers(extra_headers)

            if disable_resources or blocked_domains:
                await page.route("**/*", create_async_intercept_handler(disable_resources, blocked_domains))

            return self.page_pool.add_page(page)

    def get_pool_stats(self) -> Dict[str, int]:
        """Get statistics about the current page pool"""
        return {
            "total_pages": self.page_pool.pages_count,

View on GitHub (pinned to 5d213a2d47)

Solutions

Raise `max_pages` when constructing the session so it matches your concurrency: `DynamicSession(max_pages=n_workers)`.
Reduce per-page hold time: lower `timeout`, avoid `network_idle` on slow sites, keep `page_action` short.
Cap caller concurrency (semaphore/queue) at or below `max_pages`.
Catch `TimeoutError` around `fetch()` and reschedule that URL instead of letting it kill the batch.

Example fix

# before
with DynamicSession(max_pages=2) as s:
    with ThreadPoolExecutor(20) as pool:  # 20 fetches, 2 pages -> TimeoutError
        list(pool.map(lambda u: s.fetch(u), urls))

# after
with DynamicSession(max_pages=20) as s:
    with ThreadPoolExecutor(20) as pool:
        list(pool.map(lambda u: s.fetch(u), urls))

Defensive patterns

Strategy: retry

Validate before calling

def pool_has_room(session, needed: int = 1) -> bool:
    return session.page_pool.pages_count + needed <= session.max_pages

Try / catch

from time import sleep
for attempt in range(3):
    try:
        resp = session.fetch(url)
        break
    except TimeoutError as e:
        if 'pool' not in str(e):
            raise
        sleep(5)  # let busy pages finish, then retry
else:
    raise

Prevention

Set max_pages >= your worker count when creating the session.
Keep page_action callbacks short; they hold pooled pages.
Bound concurrency with a semaphore equal to max_pages.

When it happens

Trigger: Creating more concurrent fetches/tasks inside one `with DynamicSession(max_pages=N)` block than `N`, where all pages stay busy longer than 60s — e.g. N threads each doing slow `fetch()` calls with high `timeout`, long `wait`, or blocked `page_action` callbacks. Only applies when no explicit proxy context is used (persistent-context path).

Common situations: Scaling up a thread pool beyond the configured `max_pages`; long `network_idle`/`wait_selector` waits holding pages; a `page_action` that sleeps or waits on user input while holding a pooled page; CI environments where pages hang on bad proxies.

Understand the failure class

Timeouts: ETIMEDOUT, deadlines, and hung requests — what actually expires when a request times out.

Related errors

AI-assisted analysis of D4Vinci/Scrapling@5d213a2d47 (2026-08-14). Data as JSON: /api/errors/0036fbcadeb99a94. Report an issue: GitHub.