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Fix a bug in background updates wherein background updates are never run using the default batch size (#12157)

This commit is contained in:
Shay 2022-03-07 09:44:33 -08:00 committed by GitHub
parent f63bedef07
commit 26211fec24
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4 changed files with 16 additions and 15 deletions
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1
changelog.d/12157.bugfix Normal file
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@ -0,0 +1 @@
Fix a bug introduced in #4864 whereby background updates are never run with the default background batch size.

8
synapse/storage/background_updates.py
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@ -102,10 +102,12 @@ class BackgroundUpdatePerformance:
Returns:
A duration in ms as a float
"""
if self.avg_duration_ms == 0:
return 0
elif self.total_item_count == 0:
# We want to return None if this is the first background update item
if self.total_item_count == 0:
return None
# Avoid dividing by zero
elif self.avg_duration_ms == 0:
return 0
else:
# Use the exponential moving average so that we can adapt to
# changes in how long the update process takes.

18
tests/rest/admin/test_background_updates.py
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@ -155,10 +155,10 @@ class BackgroundUpdatesTestCase(unittest.HomeserverTestCase):
"current_updates": {
"master": {
"name": "test_update",
"average_items_per_ms": 0.001,
"average_items_per_ms": 0.1,
"total_duration_ms": 1000.0,
"total_item_count": (
BackgroundUpdater.MINIMUM_BACKGROUND_BATCH_SIZE
BackgroundUpdater.DEFAULT_BACKGROUND_BATCH_SIZE
),
}
},
@ -210,10 +210,10 @@ class BackgroundUpdatesTestCase(unittest.HomeserverTestCase):
"current_updates": {
"master": {
"name": "test_update",
"average_items_per_ms": 0.001,
"average_items_per_ms": 0.1,
"total_duration_ms": 1000.0,
"total_item_count": (
BackgroundUpdater.MINIMUM_BACKGROUND_BATCH_SIZE
BackgroundUpdater.DEFAULT_BACKGROUND_BATCH_SIZE
),
}
},
@ -239,10 +239,10 @@ class BackgroundUpdatesTestCase(unittest.HomeserverTestCase):
"current_updates": {
"master": {
"name": "test_update",
"average_items_per_ms": 0.001,
"average_items_per_ms": 0.1,
"total_duration_ms": 1000.0,
"total_item_count": (
BackgroundUpdater.MINIMUM_BACKGROUND_BATCH_SIZE
BackgroundUpdater.DEFAULT_BACKGROUND_BATCH_SIZE
),
}
},
@ -278,11 +278,9 @@ class BackgroundUpdatesTestCase(unittest.HomeserverTestCase):
"current_updates": {
"master": {
"name": "test_update",
"average_items_per_ms": 0.001,
"average_items_per_ms": 0.05263157894736842,
"total_duration_ms": 2000.0,
"total_item_count": (
2 * BackgroundUpdater.MINIMUM_BACKGROUND_BATCH_SIZE
),
"total_item_count": (110),
}
},
"enabled": True,

4
tests/storage/test_background_update.py
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@ -66,13 +66,13 @@ class BackgroundUpdateTestCase(unittest.HomeserverTestCase):
self.update_handler.reset_mock()
res = self.get_success(
self.updates.do_next_background_update(False),
by=0.01,
by=0.02,
)
self.assertFalse(res)
# on the first call, we should get run with the default background update size
self.update_handler.assert_called_once_with(
{"my_key": 1}, self.updates.MINIMUM_BACKGROUND_BATCH_SIZE
{"my_key": 1}, self.updates.DEFAULT_BACKGROUND_BATCH_SIZE
)
# second step: complete the update