Fix download speed/ETA display for re-downloads (#1294)
## Motivation After the download verification fix, when files are re-downloaded due to upstream changes (size mismatch), the download progress displays correctly (completion %, bytes, file counts), but speed shows 0 B/s and ETA shows "--" for both overall and per-file progress. ## Changes - Modified `on_progress_wrapper` in `src/exo/download/download_utils.py` to detect re-download scenarios - Added re-download detection: when `curr_bytes < previous_downloaded`, the file was deleted and download restarted - On re-download: reset `start_time` to current time and set `downloaded_this_session = curr_bytes` - Added two tests to `test_download_verification.py` covering re-download and continuing download scenarios ## Why It Works The bug occurred because: 1. `file_progress` is initialized with the OLD local file size (e.g., 1.5GB) 2. When `_download_file` detects size mismatch, it deletes the file and starts fresh 3. Progress callback receives small `curr_bytes` (e.g., 8KB) but compares against old size 4. `downloaded_this_session = 0 + (8KB - 1.5GB) = -1.5GB` (negative!) 5. Negative session bytes → 0 or negative speed → ETA shows "--" The fix detects when `curr_bytes < previous_downloaded` (indicating re-download started) and resets tracking to treat it as a fresh download. ## Test Plan ### Manual Testing <!-- Hardware: (e.g., MacBook Pro M1 Max 32GB, Mac Mini M2 16GB, connected via Thunderbolt 4) --> <!-- What you did: --> - Download a model, modify a file to change its size, restart exo, verify speed/ETA display correctly during re-download ### Automated Testing - Added `TestProgressResetOnRedownload` class with two tests: - `test_progress_resets_correctly_on_redownload`: Verifies progress resets correctly when re-download starts - `test_progress_accumulates_on_continuing_download`: Verifies continuing downloads still accumulate correctly - All 11 download tests pass - Type checking (basedpyright): 0 errors - Linting (ruff): All checks passed 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Opus 4.5 <[email protected]>
This commit is contained in:
Alex Cheema
co-authored by
Claude Opus 4.5
Claude Opus 4.5
parent
cd8c01b7c8
commit
bd4f0bf048
@@ -583,17 +583,26 @@ async def download_shard(
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async def on_progress_wrapper(
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file: FileListEntry, curr_bytes: int, total_bytes: int, is_renamed: bool
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) -> None:
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start_time = (
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file_progress[file.path].start_time
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if file.path in file_progress
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else time.time()
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)
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downloaded_this_session = (
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file_progress[file.path].downloaded_this_session.in_bytes
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+ (curr_bytes - file_progress[file.path].downloaded.in_bytes)
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if file.path in file_progress
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else curr_bytes
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previous_progress = file_progress.get(file.path)
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# Detect re-download: curr_bytes < previous downloaded means file was deleted and restarted
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is_redownload = (
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previous_progress is not None
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and curr_bytes < previous_progress.downloaded.in_bytes
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)
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if is_redownload or previous_progress is None:
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# Fresh download or re-download: reset tracking
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start_time = time.time()
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downloaded_this_session = curr_bytes
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else:
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# Continuing download: accumulate
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start_time = previous_progress.start_time
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downloaded_this_session = (
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previous_progress.downloaded_this_session.in_bytes
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+ (curr_bytes - previous_progress.downloaded.in_bytes)
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)
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speed = (
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downloaded_this_session / (time.time() - start_time)
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if time.time() - start_time > 0
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@@ -1,6 +1,8 @@
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"""Tests for download verification and cache behavior."""
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import time
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from collections.abc import AsyncIterator
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from datetime import timedelta
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from pathlib import Path
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from unittest.mock import AsyncMock, MagicMock, patch
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@@ -14,7 +16,8 @@ from exo.download.download_utils import (
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fetch_file_list_with_cache,
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)
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from exo.shared.types.common import ModelId
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from exo.shared.types.worker.downloads import FileListEntry
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from exo.shared.types.memory import Memory
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from exo.shared.types.worker.downloads import FileListEntry, RepoFileDownloadProgress
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@pytest.fixture
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@@ -319,3 +322,130 @@ class TestModelDeletion:
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result = await delete_model(model_id)
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assert result is False
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class TestProgressResetOnRedownload:
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"""Tests for progress tracking when files are re-downloaded."""
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async def test_progress_resets_correctly_on_redownload(
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self, model_id: ModelId
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) -> None:
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"""Test that progress tracking resets when a file is re-downloaded.
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When a file is deleted and re-downloaded (due to size mismatch),
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the progress tracking should reset rather than calculating negative
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downloaded_this_session values.
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"""
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# Simulate file_progress dict as it exists in download_shard
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file_progress: dict[str, RepoFileDownloadProgress] = {}
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# Initialize with old file progress (simulating existing large file)
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old_file_size = 1_500_000_000 # 1.5 GB
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file_progress["model.safetensors"] = RepoFileDownloadProgress(
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repo_id=model_id,
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repo_revision="main",
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file_path="model.safetensors",
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downloaded=Memory.from_bytes(old_file_size),
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downloaded_this_session=Memory.from_bytes(0),
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total=Memory.from_bytes(old_file_size),
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speed=0,
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eta=timedelta(0),
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status="not_started",
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start_time=time.time() - 10, # Started 10 seconds ago
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)
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# Simulate the logic from on_progress_wrapper after re-download starts
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# This is the exact logic from the fixed on_progress_wrapper
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curr_bytes = 100_000 # 100 KB - new download just started
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previous_progress = file_progress.get("model.safetensors")
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# Detect re-download: curr_bytes < previous downloaded
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is_redownload = (
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previous_progress is not None
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and curr_bytes < previous_progress.downloaded.in_bytes
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)
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if is_redownload or previous_progress is None:
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# Fresh download or re-download: reset tracking
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start_time = time.time()
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downloaded_this_session = curr_bytes
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else:
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# Continuing download: accumulate
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start_time = previous_progress.start_time
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downloaded_this_session = (
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previous_progress.downloaded_this_session.in_bytes
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+ (curr_bytes - previous_progress.downloaded.in_bytes)
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)
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# Key assertions
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assert is_redownload is True, "Should detect re-download scenario"
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assert downloaded_this_session == curr_bytes, (
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"downloaded_this_session should equal curr_bytes on re-download"
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)
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assert downloaded_this_session > 0, (
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"downloaded_this_session should be positive, not negative"
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)
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# Calculate speed (should be positive)
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elapsed = time.time() - start_time
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speed = downloaded_this_session / elapsed if elapsed > 0 else 0
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assert speed >= 0, "Speed should be non-negative"
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async def test_progress_accumulates_on_continuing_download(
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self, model_id: ModelId
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) -> None:
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"""Test that progress accumulates correctly for continuing downloads.
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When a download continues from where it left off (resume),
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the progress should accumulate correctly.
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"""
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file_progress: dict[str, RepoFileDownloadProgress] = {}
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# Initialize with partial download progress
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initial_downloaded = 500_000 # 500 KB already downloaded
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start_time = time.time() - 5 # Started 5 seconds ago
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file_progress["model.safetensors"] = RepoFileDownloadProgress(
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repo_id=model_id,
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repo_revision="main",
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file_path="model.safetensors",
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downloaded=Memory.from_bytes(initial_downloaded),
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downloaded_this_session=Memory.from_bytes(initial_downloaded),
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total=Memory.from_bytes(1_000_000),
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speed=100_000,
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eta=timedelta(seconds=5),
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status="in_progress",
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start_time=start_time,
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)
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# Progress callback with more bytes downloaded
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curr_bytes = 600_000 # 600 KB - continuing download
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previous_progress = file_progress.get("model.safetensors")
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# This is NOT a re-download (curr_bytes > previous downloaded)
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is_redownload = (
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previous_progress is not None
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and curr_bytes < previous_progress.downloaded.in_bytes
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)
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if is_redownload or previous_progress is None:
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downloaded_this_session = curr_bytes
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used_start_time = time.time()
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else:
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used_start_time = previous_progress.start_time
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downloaded_this_session = (
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previous_progress.downloaded_this_session.in_bytes
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+ (curr_bytes - previous_progress.downloaded.in_bytes)
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)
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# Key assertions
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assert is_redownload is False, (
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"Should NOT detect re-download for continuing download"
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)
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assert used_start_time == start_time, "Should preserve original start_time"
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expected_session = initial_downloaded + (curr_bytes - initial_downloaded)
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assert downloaded_this_session == expected_session, (
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f"Should accumulate: {downloaded_this_session} == {expected_session}"
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)
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assert downloaded_this_session == 600_000, (
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"downloaded_this_session should equal total downloaded so far"
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)
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