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test_download_manager.py
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207 lines (166 loc) · 8.93 KB
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import unittest
from unittest.mock import patch, MagicMock
import databricks.sql.cloudfetch.download_manager as download_manager
import databricks.sql.cloudfetch.downloader as downloader
from databricks.sql.thrift_api.TCLIService.ttypes import TSparkArrowResultLink
class DownloadManagerTests(unittest.TestCase):
"""
Unit tests for checking download manager logic.
"""
def create_download_manager(self):
max_download_threads = 10
lz4_compressed = True
return download_manager.ResultFileDownloadManager(max_download_threads, lz4_compressed)
def create_result_link(
self,
file_link: str = "fileLink",
start_row_offset: int = 0,
row_count: int = 8000,
bytes_num: int = 20971520
):
return TSparkArrowResultLink(file_link, None, start_row_offset, row_count, bytes_num)
def create_result_links(self, num_files: int, start_row_offset: int = 0):
result_links = []
for i in range(num_files):
file_link = "fileLink_" + str(i)
result_link = self.create_result_link(file_link=file_link, start_row_offset=start_row_offset)
result_links.append(result_link)
start_row_offset += result_link.rowCount
return result_links
def test_add_file_links_zero_row_count(self):
links = [self.create_result_link(row_count=0, bytes_num=0)]
manager = self.create_download_manager()
manager.add_file_links(links)
assert not manager.download_handlers
def test_add_file_links_success(self):
links = self.create_result_links(num_files=10)
manager = self.create_download_manager()
manager.add_file_links(links)
assert len(manager.download_handlers) == 10
def test_remove_past_handlers_one(self):
links = self.create_result_links(num_files=10)
manager = self.create_download_manager()
manager.add_file_links(links)
manager._remove_past_handlers(8000)
assert len(manager.download_handlers) == 9
def test_remove_past_handlers_all(self):
links = self.create_result_links(num_files=10)
manager = self.create_download_manager()
manager.add_file_links(links)
manager._remove_past_handlers(8000*10)
assert len(manager.download_handlers) == 0
@patch("concurrent.futures.ThreadPoolExecutor.submit")
def test_schedule_downloads_partial_already_scheduled(self, mock_submit):
links = self.create_result_links(num_files=10)
manager = self.create_download_manager()
manager.add_file_links(links)
for i in range(5):
manager.download_handlers[i].is_download_scheduled = True
manager._schedule_downloads()
assert mock_submit.call_count == 5
assert sum([1 if handler.is_download_scheduled else 0 for handler in manager.download_handlers]) == 10
@patch("concurrent.futures.ThreadPoolExecutor.submit")
def test_schedule_downloads_will_not_schedule_twice(self, mock_submit):
links = self.create_result_links(num_files=10)
manager = self.create_download_manager()
manager.add_file_links(links)
for i in range(5):
manager.download_handlers[i].is_download_scheduled = True
manager._schedule_downloads()
assert mock_submit.call_count == 5
assert sum([1 if handler.is_download_scheduled else 0 for handler in manager.download_handlers]) == 10
manager._schedule_downloads()
assert mock_submit.call_count == 5
@patch("concurrent.futures.ThreadPoolExecutor.submit", side_effect=[True, KeyError("foo")])
def test_schedule_downloads_submit_fails(self, mock_submit):
links = self.create_result_links(num_files=10)
manager = self.create_download_manager()
manager.add_file_links(links)
manager._schedule_downloads()
assert mock_submit.call_count == 2
assert sum([1 if handler.is_download_scheduled else 0 for handler in manager.download_handlers]) == 1
@patch("concurrent.futures.ThreadPoolExecutor.submit")
def test_find_next_file_index_all_scheduled_next_row_0(self, mock_submit):
links = self.create_result_links(num_files=10)
manager = self.create_download_manager()
manager.add_file_links(links)
manager._schedule_downloads()
assert manager._find_next_file_index(0) == 0
@patch("concurrent.futures.ThreadPoolExecutor.submit")
def test_find_next_file_index_all_scheduled_next_row_7999(self, mock_submit):
links = self.create_result_links(num_files=10)
manager = self.create_download_manager()
manager.add_file_links(links)
manager._schedule_downloads()
assert manager._find_next_file_index(7999) is None
@patch("concurrent.futures.ThreadPoolExecutor.submit")
def test_find_next_file_index_all_scheduled_next_row_8000(self, mock_submit):
links = self.create_result_links(num_files=10)
manager = self.create_download_manager()
manager.add_file_links(links)
manager._schedule_downloads()
assert manager._find_next_file_index(8000) == 1
@patch("concurrent.futures.ThreadPoolExecutor.submit", side_effect=[True, KeyError("foo")])
def test_find_next_file_index_one_scheduled_next_row_8000(self, mock_submit):
links = self.create_result_links(num_files=10)
manager = self.create_download_manager()
manager.add_file_links(links)
manager._schedule_downloads()
assert manager._find_next_file_index(8000) is None
@patch("databricks.sql.cloudfetch.downloader.ResultSetDownloadHandler.is_file_download_successful",
return_value=True)
@patch("concurrent.futures.ThreadPoolExecutor.submit")
def test_check_if_download_successful_happy(self, mock_submit, mock_is_file_download_successful):
links = self.create_result_links(num_files=10)
manager = self.create_download_manager()
manager.add_file_links(links)
manager._schedule_downloads()
status = manager._check_if_download_successful(manager.download_handlers[0])
assert status
assert manager.num_consecutive_result_file_download_retries == 0
@patch("databricks.sql.cloudfetch.downloader.ResultSetDownloadHandler.is_file_download_successful",
return_value=False)
def test_check_if_download_successful_link_expired(self, mock_is_file_download_successful):
manager = self.create_download_manager()
handler = downloader.ResultSetDownloadHandler(manager.downloadable_result_settings, self.create_result_link())
handler.is_link_expired = True
status = manager._check_if_download_successful(handler)
mock_is_file_download_successful.assert_called()
assert not status
assert manager.fetch_need_retry
@patch("databricks.sql.cloudfetch.downloader.ResultSetDownloadHandler.is_file_download_successful",
return_value=False)
def test_check_if_download_successful_download_timed_out_no_retries(self, mock_is_file_download_successful):
manager = self.create_download_manager()
handler = downloader.ResultSetDownloadHandler(manager.downloadable_result_settings, self.create_result_link())
handler.is_download_timedout = True
status = manager._check_if_download_successful(handler)
mock_is_file_download_successful.assert_called()
assert not status
assert manager.fetch_need_retry
@patch("concurrent.futures.ThreadPoolExecutor.submit")
@patch("databricks.sql.cloudfetch.downloader.ResultSetDownloadHandler.is_file_download_successful",
return_value=False)
def test_check_if_download_successful_download_timed_out_1_retry(self, mock_is_file_download_successful, mock_submit):
manager = self.create_download_manager()
manager.downloadable_result_settings = download_manager.DownloadableResultSettings(
is_lz4_compressed=True,
download_timeout=0,
max_consecutive_file_download_retries=1,
)
handler = downloader.ResultSetDownloadHandler(manager.downloadable_result_settings, self.create_result_link())
handler.is_download_timedout = True
status = manager._check_if_download_successful(handler)
assert mock_is_file_download_successful.call_count == 2
assert mock_submit.call_count == 1
assert not status
assert manager.fetch_need_retry
@patch("databricks.sql.cloudfetch.downloader.ResultSetDownloadHandler.is_file_download_successful",
return_value=False)
def test_check_if_download_successful_other_reason(self, mock_is_file_download_successful):
manager = self.create_download_manager()
handler = downloader.ResultSetDownloadHandler(manager.downloadable_result_settings, self.create_result_link())
status = manager._check_if_download_successful(handler)
mock_is_file_download_successful.assert_called()
assert not status
assert manager.fetch_need_retry