Improve async processor handling enabled items, optimize code further #5686
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Signed-off-by: Ben Ye <benye@amazon.com>
Signed-off-by: Ben Ye <benye@amazon.com>
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Signed-off-by: Ben Ye <benye@amazon.com>
alanprot
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Nov 30, 2023
| @@ -76,14 +81,23 @@ func (m *multiLevelCache) FetchMultiPostings(ctx context.Context, blockID ulid.U | |||
| backFillTimer := prometheus.NewTimer(m.backFillLatency.WithLabelValues(cacheTypePostings)) | |||
| defer backFillTimer.ObserveDuration() | |||
| for i, values := range backfillItems { | |||
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Should we put this also on the "async task"?
alanprot
reviewed
Nov 30, 2023
| if len(enabledItems[0]) == 0 { | ||
| return c[0] | ||
| } | ||
| return storecache.NewFilteredIndexCache(c[0], enabledItems[0]) |
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Do we still need this type? we cannot just use a multi level with 1 level?
alanprot
approved these changes
Nov 30, 2023
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What this PR does:
Refactored multilevel cache code to integrate it better with cache items filtering.
By filtering caches in multilevel cache itself, we can avoid putting unnecessary tasks into the async processor queue.
We observed that when backfilling a large amount of items (10M+), even if the operation is async, putting all items into the backfill queue can already take 20s+.
This change also refactor the async queue operation to not enqueue items one by one, instead we enqueue the whole items that need backfilling, and we have a cap to avoid backfilling too much data
Which issue(s) this PR fixes:
Fixes #
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]