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firestore: fix slow queries when a collection has many NO_DOCUMENT tombstones #7301

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Merged
merged 27 commits into from
Sep 9, 2025
Merged

firestore: fix slow queries when a collection has many NO_DOCUMENT tombstones #7301

merged 27 commits into from
Sep 9, 2025

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dconeybe
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@dconeybe dconeybe commented Aug 26, 2025 •
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This PR improves the performance of Firestore queries when many documents have been deleted from a collection. Each deletion leaves behind a NO_DOCUMENT "tombstone" that must be processed just like an existing document when running a query against the local cache, making queries on such collections take longer than necssary. This PR introduces a new document_type column in the remote_documents SQLite table and filters on this column during queries, avoiding loading and processing irrelevant tombstone entries, leading to substantial speedups for affected queries.

In my performance test, querying an empty collection with zero NO_DOCUMENT tombstones took 2 milliseconds. A collection with 10,000 NO_DOCUMENT tombstones took 67 milliseconds (32 times longer), despite the snapshot size being 0. With the fix in this PR, the same query of a collection with 10,000 NO_DOCUMENT tombstones took 6 milliseconds, only slightly slower than the 2 milliseconds the query takes with a fully empty collection.

Highlights

  • Database Schema Update: A new document_type column has been added to the remote_documents table in the SQLite cache to store the type of each document (e.g., NO_DOCUMENT, FOUND_DOCUMENT).
  • Document Type Persistence: The add method in SQLiteRemoteDocumentCache now persists the DocumentType (e.g., NO_DOCUMENT, FOUND_DOCUMENT) of a MutableDocument into the remote_documents table.
  • Optimized Query Filtering: The getAll method in SQLiteRemoteDocumentCache has been enhanced to allow filtering documents by their document_type directly at the database level, reducing the amount of data retrieved.
  • Document Type Backfilling: The getAll method in SQLiteRemoteDocumentCache also backfills the new "document type" column when it discovers rows with a null value. This will allow future queries to skip such rows. Such rows should only exist when upgrading from an old schema version, as The add method in SQLiteRemoteDocumentCache will set the column to the correct value.

Fixes #7295

@dconeybe
SQLiteRemoteDocumentCache.java: fix slow queries when a collection ha…
7df90c0 
…s many NO_DOCUMENT tombstones.

This is an attempt to fix #7295
@dconeybe dconeybe self-assigned this Aug 26, 2025
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github-actions bot commented Aug 26, 2025 •
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Javadoc Changes: 
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+++ /home/runner/diff/modified/reports/problems/problems-report.html	2025-09-09 00:01:44.771159603 +0000
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If this is OK, you can suppress this warning with @SuppressWarnings(\"mutable\"). Otherwise, you should replace the property with an immutable type, perhaps a simple wrapper around the original array.\n      public abstract byte[] getContents();\n                             ^"}],"contextualLabel":"[AutoValueMutable] An @AutoValue property that is a primitive array returns the original array, which can therefore be modified by the caller. If this is OK, you can suppress this warning with @SuppressWarnings(\"mutable\"). 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AsyncTask in android.os has been deprecated\n          ASYNC_THREAD_POOL_MAXIMUM_CONCURRENCY, AsyncTask.THREAD_POOL_EXECUTOR);\n                                                 ^"}],"contextualLabel":"android.os.AsyncTask in android.os has been deprecated","problemId":[{"name":"java","displayName":"Java compilation"},{"name":"compilation","displayName":"Compilation"},{"name":"compiler-warn-has-been-deprecated","displayName":"Java compilation warning"}]},{"locations":[{"path":"/home/runner/work/firebase-android-sdk/firebase-android-sdk/firebase-firestore/src/main/java/com/google/firebase/firestore/util/Executors.java","line":44,"column":59,"length":21},{"taskPath":":firebase-firestore:compileReleaseJavaWithJavac"}],"problem":[{"text":"Java compilation warning"}],"severity":"WARNING","problemDetails":[{"text":"/home/runner/work/firebase-android-sdk/firebase-android-sdk/firebase-firestore/src/main/java/com/google/firebase/firestore/util/Executors.java:44: warning: [deprecation] 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Code Review

This pull request introduces a performance optimization for queries on collections with many NO_DOCUMENT tombstones by adding a document_type column to the local cache. My review has identified two key issues. First, a critical issue in the database schema migration where existing documents are not backfilled with the new document_type, which could lead to queries failing to return cached data. Second, a high-severity issue with how bind variables are allocated for SQL queries, which could lead to a crash under certain conditions. Both issues include suggestions for fixes.

@dconeybe dconeybe mentioned this pull request Aug 26, 2025
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@dconeybe dconeybe requested a review from Copilot August 27, 2025 04:48
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Code Review

This pull request introduces a significant performance improvement for queries on collections with many deleted documents by adding a document_type column to the local cache. This allows filtering out tombstones at the database level. The implementation is solid, with appropriate schema migration and tests. I've found one potential issue in the generic query method getAll() where the backward-compatibility logic for document_type could lead to incorrect results if used with filter types other than FOUND_DOCUMENT. I've provided a suggestion to make this logic more robust.

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Can we add one more test in local store test to replicate this scenario we are fixing for future reference?

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dconeybe commented Sep 8, 2025

Can we add one more test in local store test to replicate this scenario we are fixing for future reference?

Good idea! I've added a handful of tests to firebase-firestore/src/test/java/com/google/firebase/firestore/local/SQLiteLocalStoreTest.java in commits 54a9c86, 207d77c, d58aefe, and d604be3

@dconeybe dconeybe requested a review from Copilot September 9, 2025 00:11
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Pull Request Overview

This PR improves Firestore query performance by optimizing how NO_DOCUMENT tombstones are handled in the SQLite cache. The primary goal is to reduce query times when collections contain many deleted documents, which previously required processing tombstone entries unnecessarily.

  • Added a new document_type column to the remote_documents SQLite table to enable efficient filtering
  • Enhanced query methods to filter out NO_DOCUMENT tombstones at the database level rather than in-memory
  • Implemented a backfilling mechanism to handle existing data during schema migration

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file
File Description
SQLiteSchema.java Adds schema migration to version 18 with new document_type column
SQLiteRemoteDocumentCache.java Core implementation including DocumentType enum, filtering logic, and backfilling mechanism
SQLitePersistence.java Makes LongQuery.LIMIT accessible for backfilling operations
SQLiteSchemaTest.java Adds migration compatibility test for existing documents
SQLiteLocalStoreTest.java Comprehensive tests for document type persistence and backfilling
LocalStoreTestCase.java Updates test helper methods to support new testing requirements
TestUtil.java Adds overloaded deleteMutation helper method
CHANGELOG.md Documents the performance improvement

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dconeybe commented Sep 9, 2025

/gemini summary

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Summary of Changes

This pull request significantly improves the performance of Firestore queries, particularly in collections where many documents have been deleted. By introducing a new document_type column in the local SQLite cache, the system can now efficiently filter out NO_DOCUMENT tombstones at the database level, preventing unnecessary processing and leading to substantial speedups for affected queries. This change addresses a performance bottleneck observed when collections contained a large number of deleted document markers.

Highlights

  • Database Schema Update: A new document_type column has been added to the remote_documents table in the SQLite cache to store the type of each document (e.g., NO_DOCUMENT, FOUND_DOCUMENT).
  • Document Type Persistence: The add method in SQLiteRemoteDocumentCache now persists the DocumentType (e.g., NO_DOCUMENT, FOUND_DOCUMENT) of a MutableDocument into the remote_documents table.
  • Optimized Query Filtering: The getAll method in SQLiteRemoteDocumentCache has been enhanced to allow filtering documents by their document_type directly at the database level, reducing the amount of data retrieved.
  • Targeted Query Performance: The getDocumentsMatchingQuery method now explicitly filters for FOUND_DOCUMENT types, preventing the retrieval and in-memory processing of NO_DOCUMENT tombstones that previously caused performance degradation.
Changelog
  • firebase-firestore/CHANGELOG.md
    • Added a changelog entry for improved query performance in collections with many deleted documents.
  • firebase-firestore/src/main/java/com/google/firebase/firestore/local/SQLitePersistence.java
    • Modified the LIMIT constant in LongQuery to be static final.
  • firebase-firestore/src/main/java/com/google/firebase/firestore/local/SQLiteRemoteDocumentCache.java
    • Introduced a new DocumentType enum to categorize document states (NO_DOCUMENT, FOUND_DOCUMENT, UNKNOWN_DOCUMENT, INVALID_DOCUMENT).
    • Updated the add method to store the document_type in the remote_documents table.
    • Modified getAll methods to select the new document_type column and to incorporate a DocumentTypeBackfiller to handle existing null document_type entries.
    • Optimized getDocumentsMatchingQuery to filter for FOUND_DOCUMENT types directly in the database query.
    • Added DocumentTypeBackfiller as a private static inner class to manage the backfilling of the document_type column for older entries, ensuring data consistency and query efficiency.
  • firebase-firestore/src/main/java/com/google/firebase/firestore/local/SQLiteSchema.java
    • Incremented the schema version to 18.
    • Added a new schema upgrade (addDocumentType) to introduce the document_type column to the remote_documents table.
  • firebase-firestore/src/test/java/com/google/firebase/firestore/local/LocalStoreTestCase.java
    • Adjusted method visibility for writeMutation, acknowledgeMutation, and rejectMutation to protected.
  • firebase-firestore/src/test/java/com/google/firebase/firestore/local/SQLiteLocalStoreTest.java
    • Added several new tests to verify the correct setting and backfilling of the document_type column for various document operations (add, delete, patch) and to confirm query behavior with null document_type entries.
  • firebase-firestore/src/test/java/com/google/firebase/firestore/local/SQLiteSchemaTest.java
    • Added a test case to ensure existing documents are correctly matched after the document_type column is added and schema is upgraded.
  • firebase-firestore/src/testUtil/java/com/google/firebase/firestore/testutil/TestUtil.java
    • Overloaded the deleteMutation helper method to accept a DocumentKey.
Activity
  • Automated Javadoc, Coverage, Size, and Startup Time reports were posted.
  • The author requested a Gemini review.
  • A critical review comment from gemini-code-assist[bot] highlighted the need for backfilling document_type for existing documents, which the author subsequently addressed.
  • A high-priority review comment from gemini-code-assist[bot] identified a potential ArrayIndexOutOfBoundsException in bindVars calculation, which the author promptly fixed.
  • A Copilot suggestion to extract a complex array size calculation into a helper method was acknowledged but deferred by the author.
  • The author added several new tests to SQLiteLocalStoreTest.java to cover the scenarios being fixed, based on a prior suggestion.
  • A Copilot nitpick regarding the bindVars calculation readability was noted.
  • A Copilot nitpick about the SQLitePersistence.LongQuery.LIMIT check was clarified by the author, explaining the subtlety of SQLite's placeholder indexing.
  • A Copilot nitpick about an arbitrary error code was noted.
  • The author requested a Gemini summary.

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dconeybe commented Sep 9, 2025

/gemini review

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Code Review

This pull request introduces a significant performance improvement for queries on collections with many deleted documents by adding a document_type column to the local cache. This avoids loading and processing irrelevant tombstone entries. The implementation includes a schema migration, persistence changes, and a back-filling mechanism for existing data, which is a solid and comprehensive approach. The code is well-structured and includes thorough tests. I've found one potential issue regarding a loop condition that could be fragile if a constant value changes in the future.

@dconeybe dconeybe merged commit 5c7a993 into main Sep 9, 2025
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@dconeybe dconeybe deleted the dconeybe/firestore/NoDocumentPerformanceFix branch September 9, 2025 00:31
@dconeybe dconeybe mentioned this pull request Sep 12, 2025
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Firestore cache query slow when cache filled with deleted documents
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