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fix:4.0spop #2998

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fix:4.0spop #2998

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@chejinge chejinge commented Jan 17, 2025

Summary by CodeRabbit

  • Bug Fixes

    • Improved validation for set pop operation to prevent invalid arguments
    • Enhanced randomness in member selection during set operations
  • Performance

    • Optimized member deletion process for more efficient set manipulation

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coderabbitai bot commented Jan 17, 2025

Walkthrough

The changes in the redis_sets.cc file focus on improving the SPop method for Redis set operations. The modifications include adding a validation check for the cnt parameter to ensure it is greater than zero, enhancing the random number generation seeding, and refactoring the member deletion logic. The new approach generates a vector of indices to be deleted, shuffles them, and efficiently removes the specified number of members from the set.

Changes

File Change Summary
src/storage/src/redis_sets.cc - Added validation for cnt parameter
- Improved random number generator seeding
- Refactored member deletion logic with more efficient index-based approach

Poem

🐰 In the realm of Redis sets, a rabbit's delight,
Where random pops dance with algorithmic might,
Indices shuffle, members take flight,
Validation guards, efficiency shines bright,
A code ballet of randomness and grace! 🎲

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@github-actions github-actions bot added the ☢️ Bug Something isn't working label Jan 17, 2025
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Actionable comments posted: 0

🧹 Nitpick comments (3)
src/storage/src/redis_sets.cc (3)

920-920: Consider using a member variable for the random engine.

Creating a new random engine for each call is inefficient. Consider making it a member variable of the Redis class to avoid reinitialization overhead.

-  std::default_random_engine engine(std::random_device{}());

Add to the Redis class header:

private:
  std::default_random_engine random_engine_{std::random_device{}()};

947-957: Consider using WriteBatch::Delete for bulk operations.

When deleting all members, consider using a single WriteBatch::Delete operation for better performance.

-        for (iter->Seek(sets_member_key.EncodeSeekKey());
-             iter->Valid();
-             iter->Next()) {
-          batch.Delete(handles_[kSetsDataCF], iter->key());
-          ParsedSetsMemberKey parsed_sets_member_key(iter->key());
-          members->push_back(parsed_sets_member_key.member().ToString());
-        }
+        std::string start_key = sets_member_key.EncodeSeekKey().ToString();
+        std::string end_key = start_key;
+        end_key.back()++; // Increment last byte to get range end
+        batch.DeleteRange(handles_[kSetsDataCF], start_key, end_key);
+        
+        // Still need to iterate to collect members
+        for (iter->Seek(start_key); iter->Valid() && iter->key() < end_key; iter->Next()) {
+          ParsedSetsMemberKey parsed_sets_member_key(iter->key());
+          members->push_back(parsed_sets_member_key.member().ToString());
+        }

Line range hint 990-997: Consider adding transaction support.

The meta value update and member deletions should be atomic. While WriteBatch provides some atomicity, consider adding explicit transaction support for stronger consistency guarantees.

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📥 Commits

Reviewing files that changed from the base of the PR and between fdcdd8f and 97c5fea.

📒 Files selected for processing (1)
  • src/storage/src/redis_sets.cc (3 hunks)
⏰ Context from checks skipped due to timeout of 90000ms (4)
  • GitHub Check: build_on_ubuntu
  • GitHub Check: build_on_centos
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  • GitHub Check: Analyze (go)
🔇 Additional comments (3)
src/storage/src/redis_sets.cc (3)

916-919: Good addition of input validation!

The validation check for the cnt parameter is a good defensive programming practice.


966-972: Good use of modern C++ algorithms!

The use of std::iota, std::shuffle, and std::sort is a clean and efficient way to handle random selection.


974-986: Consider adding error handling for iterator validity.

The code assumes the iterator will be valid for all target indices. Add error handling for cases where the iterator becomes invalid before reaching all targets.

         for (iter->Seek(sets_member_key.EncodeSeekKey());
              iter->Valid() && target_iter != indices.end();
              iter->Next(), ++cur_index) {
+          if (!iter->Valid()) {
+            delete iter;
+            return Status::Corruption("Iterator invalidated during member deletion");
+          }
           if (cur_index == *target_iter) {
             batch.Delete(handles_[kSetsDataCF], iter->key());
             ParsedSetsMemberKey parsed_sets_member_key(iter->key());
             members->push_back(parsed_sets_member_key.member().ToString());
             ++del_count;
             ++target_iter;
           }
         }
+        if (target_iter != indices.end()) {
+          delete iter;
+          return Status::Corruption("Failed to process all target indices");
+        }

@chejinge chejinge closed this Jan 20, 2025
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