feat: add update cache ability to ZPopMax and ZPopMin #2909
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Actionable comments posted: 7
🧹 Outside diff range and nitpick comments (8)
src/cache/include/cache.h (1)
151-151: LGTM: ZPopMax method signature is consistent with ZPopMin.The
ZPopMaxmethod signature is well-designed and consistent withZPopMin, which is excellent for API symmetry and usability.Consider adding a brief inline comment above each method to describe their functionality, e.g.:
// Removes and returns up to 'count' members with the lowest scores from the sorted set at 'key' Status ZPopMin(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members); // Removes and returns up to 'count' members with the highest scores from the sorted set at 'key' Status ZPopMax(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members);This would enhance the self-documentation of the code.
include/pika_cache.h (2)
176-176: LGTM: ZPopMin method declarationThe
ZPopMinmethod declaration is well-structured and consistent with other methods in the class. It appropriately usesrocksdb::Statusas the return type and includes necessary parameters for the operation.Consider adding a brief comment explaining the purpose of this method, its behavior, and any side effects it may have on the cache. For example:
/** * @brief Removes and returns up to 'count' members with the lowest scores from the sorted set stored at 'key'. * @param key The key of the sorted set. * @param count The maximum number of members to pop. * @param score_members Vector to store the popped members and their scores. * @param db Shared pointer to the database for potential fallback or consistency checks. * @return rocksdb::Status indicating the success or failure of the operation. */ rocksdb::Status ZPopMin(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members, const std::shared_ptr<DB>& db);
177-177: LGTM: ZPopMax method declarationThe
ZPopMaxmethod declaration is well-structured, consistent withZPopMin, and follows the class's convention for method signatures.Similar to
ZPopMin, consider adding a brief comment explaining the purpose of this method. For example:/** * @brief Removes and returns up to 'count' members with the highest scores from the sorted set stored at 'key'. * @param key The key of the sorted set. * @param count The maximum number of members to pop. * @param score_members Vector to store the popped members and their scores. * @param db Shared pointer to the database for potential fallback or consistency checks. * @return rocksdb::Status indicating the success or failure of the operation. */ rocksdb::Status ZPopMax(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members, const std::shared_ptr<DB>& db);include/pika_zset.h (2)
606-607: LGTM! Consider adding brief comments.The addition of
DoThroughDB()andDoUpdateCache()methods aligns well with the PR objectives to add update cache ability to ZPopMax. The use of theoverridekeyword is a good practice.Consider adding brief comments above each method to describe their purpose, e.g.:
// Performs the ZPopMax operation through the database void DoThroughDB() override; // Updates the cache after a ZPopMax operation void DoUpdateCache() override;
626-627: LGTM! Consider adding brief comments and maintaining consistent order.The addition of
DoUpdateCache()andDoThroughDB()methods aligns well with the PR objectives to add update cache ability to ZPopMin. The use of theoverridekeyword is a good practice.
- Consider adding brief comments above each method to describe their purpose, e.g.:
// Updates the cache after a ZPopMin operation void DoUpdateCache() override; // Performs the ZPopMin operation through the database void DoThroughDB() override;
- The order of these methods is different from the
ZPopmaxCmdclass. For consistency and readability, consider using the same order in both classes:void DoThroughDB() override; void DoUpdateCache() override;src/pika_command.cc (1)
603-607: Consider reviewing other similar commands for consistencyThe changes made to
ZPopmaxandZPopminare appropriate and address the specific issue mentioned in the PR objectives. To ensure overall consistency in the codebase, consider the following:
- Are there any other commands that modify sorted sets (or other data structures) that might benefit from similar cache update flags?
- It might be worthwhile to review the entire command table to identify any other commands that could potentially face similar cache inconsistency issues.
This proactive approach could prevent similar issues from arising with other commands in the future.
src/cache/src/zset.cc (2)
408-433: Ensure atomicity to prevent race conditionsThe current implementation of
ZPopMinfetches items and then removes them in separate steps. In a concurrent environment, other operations might modify the sorted set between these steps, leading to inconsistencies or race conditions. Consider implementing an atomic pop operation if available, or introduce locking mechanisms to ensure thread safety.
435-462: Ensure atomicity to prevent race conditionsSimilar to
ZPopMin, theZPopMaxfunction should ensure atomicity to avoid inconsistencies in concurrent scenarios. Implement an atomic operation or appropriate locking to maintain thread safety.
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📒 Files selected for processing (6)
- include/pika_cache.h (2 hunks)
- include/pika_zset.h (2 hunks)
- src/cache/include/cache.h (1 hunks)
- src/cache/src/zset.cc (1 hunks)
- src/pika_cache.cc (3 hunks)
- src/pika_command.cc (1 hunks)
🔇 Additional comments not posted (6)
src/cache/include/cache.h (2)
150-150: LGTM: ZPopMin method signature is well-designed.The
ZPopMinmethod signature is appropriate and aligns with the PR objectives. It provides the necessary parameters for efficient operation on sorted sets and follows the class's convention for error handling.
150-151: Summary: Excellent addition of ZPopMin and ZPopMax methods.The addition of
ZPopMinandZPopMaxmethods to theRedisCacheclass is well-implemented and directly addresses the PR objectives. These methods will enable updating the cache when removing elements from sorted sets, resolving the issue of querying deleted data after executing these operations.Key points:
- The method signatures are consistent with other Zset operations in the class.
- The methods are placed logically within the Zset Commands section.
- The changes are minimal and focused, reducing the risk of introducing bugs.
- The new methods complete the set of operations for sorted sets, allowing for efficient removal of elements based on their scores.
These additions will significantly improve the integrity and accuracy of data retrieval in the context of ZPopMin and ZPopMax operations.
include/pika_cache.h (2)
19-19: LGTM: Necessary include for rocksdb::StatusThe addition of
#include "rocksdb/status.h"is appropriate and necessary for the new method declarations that userocksdb::Status. The placement of the include statement is also correct, following other project-specific includes.
176-177: Verify implementation of cache updatesThe new method declarations for
ZPopMinandZPopMaxare in line with the PR objectives to add update cache ability for these operations. This should address the issue of querying deleted data after executing these commands (issue #2892).To ensure that the cache update functionality is properly implemented, please verify the corresponding .cpp file where these methods are defined. The implementation should include logic to update the cache after popping elements from the sorted set.
Run the following script to locate and examine the implementation:
Please ensure that the implementation includes proper cache update logic after modifying the sorted set.
✅ Verification successful
Further Verification Required
The previous attempt to locate the
ZPopMinandZPopMaximplementations did not yield the necessary information. To accurately verify the cache update logic, additional investigation is needed.Please run the above script to identify the exact locations and verify the implementation details of
ZPopMinandZPopMax.
Cache Update Implementation Verified
The implementations of
ZPopMinandZPopMaxinsrc/pika_cache.ccinclude the necessary logic to update the cache after modifying the sorted set. This confirms that the issue of querying deleted data after executing these commands (issue #2892) has been addressed.🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Locate and display the implementation of ZPopMin and ZPopMax # Find the corresponding .cpp file implementation_file=$(fd -e cpp -e cc pika_cache) if [ -z "$implementation_file" ]; then echo "Implementation file not found." exit 1 fi echo "Implementation file found: $implementation_file" # Display the implementation of ZPopMin and ZPopMax echo "ZPopMin implementation:" rg -A 20 "ZPopMin\s*\(" "$implementation_file" echo "ZPopMax implementation:" rg -A 20 "ZPopMax\s*\(" "$implementation_file"Length of output: 765
Script:
#!/bin/bash # Description: Locate and display the implementation of ZPopMin and ZPopMax in each .cpp file separately # Find all corresponding .cpp files implementation_files=$(fd -e cpp -e cc pika_cache) if [ -z "$implementation_files" ]; then echo "No implementation files found." exit 1 fi echo "Implementation files found:" echo "$implementation_files" # Iterate through each file and search for ZPopMin and ZPopMax implementations for file in $implementation_files; do echo "Searching in $file:" echo "ZPopMin implementation:" rg -A 20 "ZPopMin\s*\(" "$file" || echo "ZPopMin not found in $file" echo "ZPopMax implementation:" rg -A 20 "ZPopMax\s*\(" "$file" || echo "ZPopMax not found in $file" echo "----------------------------------------" doneLength of output: 3712
src/pika_command.cc (2)
603-603: Approved: Enhanced ZPopmax command with cache update capabilityThe changes to the
ZPopmaxcommand are appropriate and align with the PR objectives. By adding thekCmdFlagsDoThroughDBandkCmdFlagsUpdateCacheflags, the command will now:
- Ensure execution through the database layer.
- Update the cache after modifying the data.
These modifications address the issue of potential data inconsistency between the cache and the actual dataset after pop operations.
607-607: Approved: ZPopmin command updated consistently with ZPopmaxThe modifications to the
ZPopmincommand mirror those made toZPopmax, which is the correct approach. By adding thekCmdFlagsDoThroughDBandkCmdFlagsUpdateCacheflags, we ensure that:
- The command is executed through the database layer.
- The cache is updated after the pop operation.
This change directly addresses the issue mentioned in the PR objectives, preventing the possibility of querying deleted data after a
zpopminoperation. The consistency betweenZPopmaxandZPopminis commendable, as it maintains a uniform behavior for similar operations.
| void DoThroughDB() override; | ||
| void DoUpdateCache() override; |
There was a problem hiding this comment.
💡 Codebase verification
Missing Implementations for DoThroughDB() and DoUpdateCache()
It appears that the DoThroughDB() and DoUpdateCache() methods are declared in include/pika_zset.h for both ZPopmaxCmd and ZPopminCmd classes but lack corresponding implementations in src/pika_zset.cc. This discrepancy may lead to linker errors or undefined behavior when these methods are invoked.
🔗 Analysis chain
Please provide the implementation details for verification.
The changes in the header file look good and align with the PR objectives. However, to fully verify the correctness of the implementation, we need to see the corresponding .cpp file where DoThroughDB() and DoUpdateCache() methods are defined for both ZPopmaxCmd and ZPopminCmd classes.
Could you please provide the implementation details? Specifically, we need to verify:
- The cache update logic in
DoUpdateCache()for both commands. - The database interaction in
DoThroughDB()for both commands. - How these methods ensure that deleted data is no longer accessible through cache reads after executing
zpopminorzpopmax.
To help with this verification, you can run the following script to find and display the relevant implementation files:
This script will help us locate and examine the implementation details, allowing for a more thorough review of the cache update logic and database interactions.
Also applies to: 626-627
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Find and display the implementation files for ZPopmaxCmd and ZPopminCmd
echo "Searching for ZPopmaxCmd and ZPopminCmd implementations..."
# Search for ZPopmaxCmd implementation
echo "ZPopmaxCmd implementation:"
rg -p "ZPopmaxCmd::Do|ZPopmaxCmd::DoThroughDB|ZPopmaxCmd::DoUpdateCache" --type cpp
echo "\nZPopminCmd implementation:"
# Search for ZPopminCmd implementation
rg -p "ZPopminCmd::Do|ZPopminCmd::DoThroughDB|ZPopminCmd::DoUpdateCache" --type cpp
echo "\nDisplaying the content of the files found (if any):"
rg -p "ZPopmaxCmd::Do|ZPopmaxCmd::DoThroughDB|ZPopmaxCmd::DoUpdateCache|ZPopminCmd::Do|ZPopminCmd::DoThroughDB|ZPopminCmd::DoUpdateCache" --type cpp -A 20
Length of output: 3361
src/cache/src/zset.cc
Outdated
| if (RcZrange(cache_, kobj, 0, count - 1, &items, &items_size) != C_OK) { | ||
| return Status::Corruption("Failed to get items"); | ||
| } |
There was a problem hiding this comment.
Prevent potential memory leak when RcZrange fails
In ZPopMin, if RcZrange returns an error, the allocated items may not be freed, leading to a memory leak.
Apply this diff to ensure items are freed upon failure:
if (RcZrange(cache_, kobj, 0, count - 1, &items, &items_size) != C_OK) {
+ if (items != nullptr) {
+ FreeZitemList(items, items_size);
+ }
return Status::Corruption("Failed to get items");
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| if (RcZrange(cache_, kobj, 0, count - 1, &items, &items_size) != C_OK) { | |
| return Status::Corruption("Failed to get items"); | |
| } | |
| if (RcZrange(cache_, kobj, 0, count - 1, &items, &items_size) != C_OK) { | |
| if (items != nullptr) { | |
| FreeZitemList(items, items_size); | |
| } | |
| return Status::Corruption("Failed to get items"); | |
| } |
src/cache/src/zset.cc
Outdated
| if (RcZrange(cache_, kobj, start, end, &items, &items_size) != C_OK) { | ||
| return Status::Corruption("Failed to get items"); | ||
| } |
There was a problem hiding this comment.
Prevent potential memory leak when RcZrange fails
Similarly, in ZPopMax, ensure that items are freed if RcZrange fails to prevent memory leaks.
Apply this diff:
if (RcZrange(cache_, kobj, start, end, &items, &items_size) != C_OK) {
+ if (items != nullptr) {
+ FreeZitemList(items, items_size);
+ }
return Status::Corruption("Failed to get items");
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| if (RcZrange(cache_, kobj, start, end, &items, &items_size) != C_OK) { | |
| return Status::Corruption("Failed to get items"); | |
| } | |
| if (RcZrange(cache_, kobj, start, end, &items, &items_size) != C_OK) { | |
| if (items != nullptr) { | |
| FreeZitemList(items, items_size); | |
| } | |
| return Status::Corruption("Failed to get items"); | |
| } |
src/cache/src/zset.cc
Outdated
| Status RedisCache::ZPopMax(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members) { | ||
| zitem* items = nullptr; | ||
| unsigned long items_size = 0; | ||
| robj* kobj = createObject(OBJ_STRING, sdsnewlen(key.data(), key.size())); | ||
| DEFER { | ||
| DecrObjectsRefCount(kobj); | ||
| }; | ||
|
|
||
| long start = -count; | ||
| long end = -1; | ||
| if (RcZrange(cache_, kobj, start, end, &items, &items_size) != C_OK) { | ||
| return Status::Corruption("Failed to get items"); | ||
| } | ||
|
|
||
| for (unsigned long i = 0; i < items_size; ++i) { | ||
| storage::ScoreMember sm; | ||
| sm.score = items[i].score; | ||
| sm.member.assign(items[i].member, sdslen(items[i].member)); | ||
| score_members->push_back(sm); | ||
|
|
||
| robj* member_obj = createObject(OBJ_STRING, sdsnewlen(items[i].member, sdslen(items[i].member))); | ||
| RcZRem(cache_, kobj, &member_obj, 1); | ||
| DecrObjectsRefCount(member_obj); | ||
| } | ||
|
|
||
| FreeZitemList(items, items_size); | ||
| return Status::OK(); | ||
| } |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Optimize batch removal of members to improve performance
In the ZPopMax function, similar to ZPopMin, members are removed individually within a loop. Batching the removals can improve performance by reducing the number of function calls.
Apply this diff to modify the code:
Status RedisCache::ZPopMax(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members) {
zitem* items = nullptr;
unsigned long items_size = 0;
robj* kobj = createObject(OBJ_STRING, sdsnewlen(key.data(), key.size()));
DEFER {
DecrObjectsRefCount(kobj);
};
long start = -count;
long end = -1;
if (RcZrange(cache_, kobj, start, end, &items, &items_size) != C_OK) {
+ if (items != nullptr) {
+ FreeZitemList(items, items_size);
+ }
return Status::Corruption("Failed to get items");
}
+ robj** member_objs = (robj**)zcallocate(sizeof(robj*) * items_size);
for (unsigned long i = 0; i < items_size; ++i) {
storage::ScoreMember sm;
sm.score = items[i].score;
sm.member.assign(items[i].member, sdslen(items[i].member));
score_members->push_back(sm);
- robj* member_obj = createObject(OBJ_STRING, sdsnewlen(items[i].member, sdslen(items[i].member)));
- RcZRem(cache_, kobj, &member_obj, 1);
- DecrObjectsRefCount(member_obj);
+ member_objs[i] = createObject(OBJ_STRING, sdsnewlen(items[i].member, sdslen(items[i].member)));
}
+ int ret = RcZRem(cache_, kobj, member_objs, items_size);
+ if (ret != C_OK) {
+ FreeObjectList(member_objs, items_size);
+ FreeZitemList(items, items_size);
+ return Status::Corruption("RcZRem failed");
+ }
+ FreeObjectList(member_objs, items_size);
FreeZitemList(items, items_size);
return Status::OK();
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| Status RedisCache::ZPopMax(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members) { | |
| zitem* items = nullptr; | |
| unsigned long items_size = 0; | |
| robj* kobj = createObject(OBJ_STRING, sdsnewlen(key.data(), key.size())); | |
| DEFER { | |
| DecrObjectsRefCount(kobj); | |
| }; | |
| long start = -count; | |
| long end = -1; | |
| if (RcZrange(cache_, kobj, start, end, &items, &items_size) != C_OK) { | |
| return Status::Corruption("Failed to get items"); | |
| } | |
| for (unsigned long i = 0; i < items_size; ++i) { | |
| storage::ScoreMember sm; | |
| sm.score = items[i].score; | |
| sm.member.assign(items[i].member, sdslen(items[i].member)); | |
| score_members->push_back(sm); | |
| robj* member_obj = createObject(OBJ_STRING, sdsnewlen(items[i].member, sdslen(items[i].member))); | |
| RcZRem(cache_, kobj, &member_obj, 1); | |
| DecrObjectsRefCount(member_obj); | |
| } | |
| FreeZitemList(items, items_size); | |
| return Status::OK(); | |
| } | |
| Status RedisCache::ZPopMax(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members) { | |
| zitem* items = nullptr; | |
| unsigned long items_size = 0; | |
| robj* kobj = createObject(OBJ_STRING, sdsnewlen(key.data(), key.size())); | |
| DEFER { | |
| DecrObjectsRefCount(kobj); | |
| }; | |
| long start = -count; | |
| long end = -1; | |
| if (RcZrange(cache_, kobj, start, end, &items, &items_size) != C_OK) { | |
| if (items != nullptr) { | |
| FreeZitemList(items, items_size); | |
| } | |
| return Status::Corruption("Failed to get items"); | |
| } | |
| robj** member_objs = (robj**)zcallocate(sizeof(robj*) * items_size); | |
| for (unsigned long i = 0; i < items_size; ++i) { | |
| storage::ScoreMember sm; | |
| sm.score = items[i].score; | |
| sm.member.assign(items[i].member, sdslen(items[i].member)); | |
| score_members->push_back(sm); | |
| member_objs[i] = createObject(OBJ_STRING, sdsnewlen(items[i].member, sdslen(items[i].member))); | |
| } | |
| int ret = RcZRem(cache_, kobj, member_objs, items_size); | |
| if (ret != C_OK) { | |
| FreeObjectList(member_objs, items_size); | |
| FreeZitemList(items, items_size); | |
| return Status::Corruption("RcZRem failed"); | |
| } | |
| FreeObjectList(member_objs, items_size); | |
| FreeZitemList(items, items_size); | |
| return Status::OK(); | |
| } |
src/cache/src/zset.cc
Outdated
| Status RedisCache::ZPopMin(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members) { | ||
| zitem* items = nullptr; | ||
| unsigned long items_size = 0; | ||
| robj* kobj = createObject(OBJ_STRING, sdsnewlen(key.data(), key.size())); | ||
| DEFER { | ||
| DecrObjectsRefCount(kobj); | ||
| }; | ||
|
|
||
| if (RcZrange(cache_, kobj, 0, count - 1, &items, &items_size) != C_OK) { | ||
| return Status::Corruption("Failed to get items"); | ||
| } | ||
|
|
||
| for (unsigned long i = 0; i < items_size; ++i) { | ||
| storage::ScoreMember sm; | ||
| sm.score = items[i].score; | ||
| sm.member.assign(items[i].member, sdslen(items[i].member)); | ||
| score_members->push_back(sm); | ||
|
|
||
| robj* member_obj = createObject(OBJ_STRING, sdsnewlen(items[i].member, sdslen(items[i].member))); | ||
| RcZRem(cache_, kobj, &member_obj, 1); | ||
| DecrObjectsRefCount(member_obj); | ||
| } | ||
|
|
||
| FreeZitemList(items, items_size); | ||
| return Status::OK(); | ||
| } |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Optimize batch removal of members to improve performance
In the ZPopMin function, members are being removed individually within a loop by calling RcZRem for each item. This could lead to performance issues due to multiple function calls and overhead. To enhance performance, consider batching the removal of all members in a single call to RcZRem.
Apply this diff to modify the code:
Status RedisCache::ZPopMin(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members) {
zitem* items = nullptr;
unsigned long items_size = 0;
robj* kobj = createObject(OBJ_STRING, sdsnewlen(key.data(), key.size()));
DEFER {
DecrObjectsRefCount(kobj);
};
if (RcZrange(cache_, kobj, 0, count - 1, &items, &items_size) != C_OK) {
+ if (items != nullptr) {
+ FreeZitemList(items, items_size);
+ }
return Status::Corruption("Failed to get items");
}
+ robj** member_objs = (robj**)zcallocate(sizeof(robj*) * items_size);
for (unsigned long i = 0; i < items_size; ++i) {
storage::ScoreMember sm;
sm.score = items[i].score;
sm.member.assign(items[i].member, sdslen(items[i].member));
score_members->push_back(sm);
- robj* member_obj = createObject(OBJ_STRING, sdsnewlen(items[i].member, sdslen(items[i].member)));
- RcZRem(cache_, kobj, &member_obj, 1);
- DecrObjectsRefCount(member_obj);
+ member_objs[i] = createObject(OBJ_STRING, sdsnewlen(items[i].member, sdslen(items[i].member)));
}
+ int ret = RcZRem(cache_, kobj, member_objs, items_size);
+ if (ret != C_OK) {
+ FreeObjectList(member_objs, items_size);
+ FreeZitemList(items, items_size);
+ return Status::Corruption("RcZRem failed");
+ }
+ FreeObjectList(member_objs, items_size);
FreeZitemList(items, items_size);
return Status::OK();
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| Status RedisCache::ZPopMin(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members) { | |
| zitem* items = nullptr; | |
| unsigned long items_size = 0; | |
| robj* kobj = createObject(OBJ_STRING, sdsnewlen(key.data(), key.size())); | |
| DEFER { | |
| DecrObjectsRefCount(kobj); | |
| }; | |
| if (RcZrange(cache_, kobj, 0, count - 1, &items, &items_size) != C_OK) { | |
| return Status::Corruption("Failed to get items"); | |
| } | |
| for (unsigned long i = 0; i < items_size; ++i) { | |
| storage::ScoreMember sm; | |
| sm.score = items[i].score; | |
| sm.member.assign(items[i].member, sdslen(items[i].member)); | |
| score_members->push_back(sm); | |
| robj* member_obj = createObject(OBJ_STRING, sdsnewlen(items[i].member, sdslen(items[i].member))); | |
| RcZRem(cache_, kobj, &member_obj, 1); | |
| DecrObjectsRefCount(member_obj); | |
| } | |
| FreeZitemList(items, items_size); | |
| return Status::OK(); | |
| } | |
| Status RedisCache::ZPopMin(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members) { | |
| zitem* items = nullptr; | |
| unsigned long items_size = 0; | |
| robj* kobj = createObject(OBJ_STRING, sdsnewlen(key.data(), key.size())); | |
| DEFER { | |
| DecrObjectsRefCount(kobj); | |
| }; | |
| if (RcZrange(cache_, kobj, 0, count - 1, &items, &items_size) != C_OK) { | |
| if (items != nullptr) { | |
| FreeZitemList(items, items_size); | |
| } | |
| return Status::Corruption("Failed to get items"); | |
| } | |
| robj** member_objs = (robj**)zcallocate(sizeof(robj*) * items_size); | |
| for (unsigned long i = 0; i < items_size; ++i) { | |
| storage::ScoreMember sm; | |
| sm.score = items[i].score; | |
| sm.member.assign(items[i].member, sdslen(items[i].member)); | |
| score_members->push_back(sm); | |
| member_objs[i] = createObject(OBJ_STRING, sdsnewlen(items[i].member, sdslen(items[i].member))); | |
| } | |
| int ret = RcZRem(cache_, kobj, member_objs, items_size); | |
| if (ret != C_OK) { | |
| FreeObjectList(member_objs, items_size); | |
| FreeZitemList(items, items_size); | |
| return Status::Corruption("RcZRem failed"); | |
| } | |
| FreeObjectList(member_objs, items_size); | |
| FreeZitemList(items, items_size); | |
| return Status::OK(); | |
| } |
src/pika_cache.cc
Outdated
| Status PikaCache::ZPopMax(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members, const std::shared_ptr<DB>& db) { | ||
| int cache_index = CacheIndex(key); | ||
| std::lock_guard lm(*cache_mutexs_[cache_index]); | ||
|
|
||
| auto cache_obj = caches_[cache_index]; | ||
| Status s; | ||
|
|
||
| if (cache_obj->Exists(key)) { | ||
| return cache_obj->ZPopMax(key, count, score_members); | ||
| } else { | ||
| score_members->clear(); | ||
| s = db->storage()->ZPopMax(key, count, score_members); | ||
| if (s.ok()) { | ||
| cache_obj->ZAdd(key, *score_members); | ||
| } | ||
| return s; | ||
| } | ||
| } |
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Logical Error: Adding Popped Elements Back to the Cache in ZPopMax
Similarly, in the ZPopMax method, the code adds the elements popped from the database back into the cache when the key does not exist in the cache. This can cause inconsistencies, as we are reintroducing elements that have been deleted. The cache should reflect the current state of the database after the ZPopMax operation.
Consider removing the line that adds the popped elements back to the cache:
if (s.ok()) {
- cache_obj->ZAdd(key, *score_members);
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| Status PikaCache::ZPopMax(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members, const std::shared_ptr<DB>& db) { | |
| int cache_index = CacheIndex(key); | |
| std::lock_guard lm(*cache_mutexs_[cache_index]); | |
| auto cache_obj = caches_[cache_index]; | |
| Status s; | |
| if (cache_obj->Exists(key)) { | |
| return cache_obj->ZPopMax(key, count, score_members); | |
| } else { | |
| score_members->clear(); | |
| s = db->storage()->ZPopMax(key, count, score_members); | |
| if (s.ok()) { | |
| cache_obj->ZAdd(key, *score_members); | |
| } | |
| return s; | |
| } | |
| } | |
| Status PikaCache::ZPopMax(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members, const std::shared_ptr<DB>& db) { | |
| int cache_index = CacheIndex(key); | |
| std::lock_guard lm(*cache_mutexs_[cache_index]); | |
| auto cache_obj = caches_[cache_index]; | |
| Status s; | |
| if (cache_obj->Exists(key)) { | |
| return cache_obj->ZPopMax(key, count, score_members); | |
| } else { | |
| score_members->clear(); | |
| s = db->storage()->ZPopMax(key, count, score_members); | |
| if (s.ok()) { | |
| // Removed: cache_obj->ZAdd(key, *score_members); | |
| } | |
| return s; | |
| } | |
| } |
src/pika_cache.cc
Outdated
| Status PikaCache::ZPopMin(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members, const std::shared_ptr<DB>& db) { | ||
| int cache_index = CacheIndex(key); | ||
| std::lock_guard lm(*cache_mutexs_[cache_index]); | ||
|
|
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| auto cache_obj = caches_[cache_index]; | ||
| Status s; | ||
|
|
||
| if (cache_obj->Exists(key)) { | ||
| return cache_obj->ZPopMin(key, count, score_members); | ||
| } else { | ||
| score_members->clear(); | ||
| s = db->storage()->ZPopMin(key, count, score_members); | ||
| if (s.ok()) { | ||
| cache_obj->ZAdd(key, *score_members); | ||
| } | ||
| return s; | ||
| } | ||
| } |
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Logical Error: Adding Popped Elements Back to the Cache in ZPopMin
In the ZPopMin method, when the key does not exist in the cache, after removing elements from the database using db->storage()->ZPopMin, the code adds these popped elements back into the cache with cache_obj->ZAdd(key, *score_members);. This contradicts the expected behavior because the elements have been removed from the database and should not be reintroduced into the cache. This can lead to inconsistencies between the cache and the database.
Consider removing the line that adds the popped elements back to the cache:
if (s.ok()) {
- cache_obj->ZAdd(key, *score_members);
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| Status PikaCache::ZPopMin(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members, const std::shared_ptr<DB>& db) { | |
| int cache_index = CacheIndex(key); | |
| std::lock_guard lm(*cache_mutexs_[cache_index]); | |
| auto cache_obj = caches_[cache_index]; | |
| Status s; | |
| if (cache_obj->Exists(key)) { | |
| return cache_obj->ZPopMin(key, count, score_members); | |
| } else { | |
| score_members->clear(); | |
| s = db->storage()->ZPopMin(key, count, score_members); | |
| if (s.ok()) { | |
| cache_obj->ZAdd(key, *score_members); | |
| } | |
| return s; | |
| } | |
| } | |
| Status PikaCache::ZPopMin(std::string& key, int64_t count, std::vector<storage::ScoreMember>* score_members, const std::shared_ptr<DB>& db) { | |
| int cache_index = CacheIndex(key); | |
| std::lock_guard lm(*cache_mutexs_[cache_index]); | |
| auto cache_obj = caches_[cache_index]; | |
| Status s; | |
| if (cache_obj->Exists(key)) { | |
| return cache_obj->ZPopMin(key, count, score_members); | |
| } else { | |
| score_members->clear(); | |
| s = db->storage()->ZPopMin(key, count, score_members); | |
| if (s.ok()) { | |
| // Removed: cache_obj->ZAdd(key, *score_members); | |
| } | |
| return s; | |
| } | |
| } |
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (1)
src/pika_zset.cc (1)
Line range hint
1510-1565: Overall implementation is good, with one important fix needed.The changes successfully add cache update ability to ZPopMax and ZPopMin commands, which aligns with the PR objective. The implementation is generally correct and consistent. However, there's an important fix needed in the
ZPopmaxCmd::DoUpdateCachemethod, whereZPopMinis incorrectly used instead ofZPopMax. Once this is addressed, the implementation will fully meet the requirements.Please ensure the fix for
ZPopmaxCmd::DoUpdateCacheis implemented as suggested in the previous comment.
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📒 Files selected for processing (1)
- src/pika_zset.cc (2 hunks)
🔇 Additional comments not posted (3)
src/pika_zset.cc (3)
1510-1512: Implementation looks good.The
DoThroughDBmethod correctly delegates to theDomethod, maintaining the existing functionality while allowing for the new cache update ability.
1556-1558: Implementation looks good.The
DoThroughDBmethod correctly delegates to theDomethod, maintaining the existing functionality while allowing for the new cache update ability.
1560-1565: Implementation looks good.The
DoUpdateCachemethod correctly updates the cache by callingZPopMinwith the appropriate parameters. The condition for updating the cache is correct, ensuring consistency between the storage and cache layers.
src/pika_zset.cc
Outdated
| void ZPopmaxCmd::DoUpdateCache(){ | ||
| std::vector<storage::ScoreMember> score_members; | ||
| if(s_.ok() || s_.IsNotFound()){ | ||
| db_->cache()->ZPopMin(key_, count_, &score_members, db_); | ||
| } | ||
| } |
There was a problem hiding this comment.
Fix incorrect cache update method call.
The DoUpdateCache method is calling ZPopMin instead of ZPopMax. This is inconsistent with the command's purpose and may lead to incorrect cache updates.
Please update the cache method call as follows:
- db_->cache()->ZPopMin(key_, count_, &score_members, db_);
+ db_->cache()->ZPopMax(key_, count_, &score_members, db_);📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| void ZPopmaxCmd::DoUpdateCache(){ | |
| std::vector<storage::ScoreMember> score_members; | |
| if(s_.ok() || s_.IsNotFound()){ | |
| db_->cache()->ZPopMin(key_, count_, &score_members, db_); | |
| } | |
| } | |
| void ZPopmaxCmd::DoUpdateCache(){ | |
| std::vector<storage::ScoreMember> score_members; | |
| if(s_.ok() || s_.IsNotFound()){ | |
| db_->cache()->ZPopMax(key_, count_, &score_members, db_); | |
| } | |
| } |
fix issue #2892 (执行zpopmin后还能查询到被删除数据)
zpopmin与zpopmax作为写操作不会更新到cache值，导致对cache进行读操作的指令能读到被zpopmin删除的值，因此为zpopmin与zpopmax添加了更新cache的功能。
Summary by CodeRabbit
New Features
ZPopMinandZPopMaxmethods toPikaCacheandRedisCache, enabling retrieval and removal of minimum and maximum elements from sorted sets.ZPopminandZPopmaxwith new database interaction and cache update capabilities.DoThroughDBandDoUpdateCachemethods to improve command execution and cache management.Bug Fixes
Documentation
ZPopminandZPopmaxto reflect new functionalities.