firestore: re-write BackgroundQueue to NOT use the deprecated AsyncTask thread pool #7376
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…sk thread pool
This change results in a significant performance improvement of queries with a large
number of documents in their result set.
In my testing, the performance improved by 91% from 3022 ms down to 265 ms on a real
device! For some reason, there were _no_ performance gains on the Android emulator.
This must have something to do with how different Android OS versions manage the
threads in the (deprecated) AsyncTask thread pool.
The test environment was as follows:
- Pixel 7 Pro real device running Android 16.
- Test called collectionRef.whereGreaterThan("foo", 50).get(Source.CACHE) 200 times.
- Calculated the average amount of time it took for the query results to be received.
- collectionRef is a Firestore collection containing 10,000 documents, of which 50%
match the "whereGreaterThan" filter.
- Local cache had no other documents in it.
- Test app was compiled in "release" mode with "proguard-android-optimize.txt" r8 configuration.
Javadoc Changes:--- /home/runner/diff/original/reports/problems/problems-report.html 2025-09-16 02:30:58.870102914 +0000
+++ /home/runner/diff/modified/reports/problems/problems-report.html 2025-09-16 02:28:37.287335855 +0000
@@ -650,7 +650,7 @@
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Summary of Changes
Hello @dconeybe, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request significantly enhances the performance of Firestore queries, particularly those involving large result sets, by overhauling the underlying background task execution mechanism. It deprecates the use of Android's AsyncTask thread pool in favor of a custom, self-managed thread pool implemented in Kotlin. This modernization provides more robust and efficient parallel processing, directly addressing performance bottlenecks and yielding substantial speed improvements on real devices.
Highlights
- Performance Improvement: Replaced the deprecated AsyncTask thread pool with a self-managed thread pool, leading to a 91% performance improvement for queries with large result sets on real devices.
- Modernized Background Task Execution: The BackgroundQueue utility has been re-written in Kotlin to manage CPU-bound work on background threads, ensuring better control and efficiency compared to the old AsyncTask based implementation.
- Code Refactoring: Updated SQLiteDocumentOverlayCache, SQLiteRemoteDocumentCache, and QueryTest to utilize the new BackgroundQueue.submit() method, simplifying background task submission logic.
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Code Review
This pull request provides a significant performance improvement by rewriting the BackgroundQueue to use a self-managed, coroutine-based thread pool instead of the deprecated AsyncTask thread pool. The implementation has been converted from Java to Kotlin, incorporating a state machine for safer usage. My review includes a minor suggestion to update a placeholder in the CHANGELOG.md and a small refactoring in the new BackgroundQueue for better readability. Overall, the changes are well-implemented and address the performance issue effectively.
firebase-firestore/src/main/java/com/google/firebase/firestore/util/BackgroundQueue.kt
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Coverage Report 1Affected Products
Test Logs |
Size Report 1Affected Products
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Startup Time Report 1Note: Layout is sometimes suboptimal due to limited formatting support on GitHub. Please check this report on GCS. Notes
Startup Times
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This reverts commit 32c3add. It made no performance improvements whatsoever.
MarkDuckworth
approved these changes
Sep 15, 2025
firebase-firestore/src/main/java/com/google/firebase/firestore/util/BackgroundQueue.kt
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… to improve readability.
dconeybe
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Sep 16, 2025
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Startup time changes appear to be consistent in other open PRs (e.g. #7378), suggesting that the cause of that is unrelated. |
MarkDuckworth
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…sk thread pool (#7376) This change results in a significant performance improvement of queries with a large number of documents in their result set. In my testing, the performance improved by 91% from 3022 ms down to 265 ms on a real device! For some reason, there were _no_ performance gains on the Android emulator. This must have something to do with how different Android OS versions manage the threads in the (deprecated) AsyncTask thread pool. The test environment was as follows: - Pixel 7 Pro real device running Android 16. - Test called collectionRef.whereGreaterThan("foo", 50).get(Source.CACHE) 200 times. - Calculated the average amount of time it took for the query results to be received. - collectionRef is a Firestore collection containing 10,000 documents, of which 50% match the "whereGreaterThan" filter. - Local cache had no other documents in it. - Test app was compiled in "release" mode with "proguard-android-optimize.txt" r8 configuration.
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This change results in a significant performance improvement of queries with a large number of documents in their result set.
In my testing, the performance improved by 91% from 3022 ms down to 265 ms on a real device! For some reason, there were no performance gains on the Android emulator. This must have something to do with how different Android OS versions manage the threads in the (deprecated) AsyncTask thread pool.
The test environment was as follows: