fix: rpoplpush cause inconsistency in cache mode #2976
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Actionable comments posted: 0
🧹 Nitpick comments (1)
src/pika_list.cc (1)
850-857: Optimize vector allocation in DoUpdateCache()The current implementation unnecessarily uses vector allocation for a single value. Consider simplifying this.
void RPopLPushCmd::DoUpdateCache() { if (s_.ok()) { - std::vector<std::string> value; - value.resize(1); - db_->cache()->RPop(source_, &value[0]); - db_->cache()->LPushx(receiver_, value); + std::string value; + db_->cache()->RPop(source_, &value); + std::vector<std::string> values{value}; + db_->cache()->LPushx(receiver_, values); } }
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Review profile: CHILL
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📒 Files selected for processing (3)
include/pika_list.h(1 hunks)src/pika_command.cc(1 hunks)src/pika_list.cc(1 hunks)
🔇 Additional comments (4)
include/pika_list.h (1)
367-368: LGTM: Method declarations align with caching mechanism
The addition of DoThroughDB() and DoUpdateCache() methods follows the established pattern for cache-aware commands in the codebase.
src/pika_list.cc (1)
858-860: LGTM: DoThroughDB implementation is correct
The implementation correctly delegates to the existing Do() method, maintaining consistency with other commands.
src/pika_command.cc (2)
504-504: LGTM: Command flags properly configured for cache support
The addition of kCmdFlagsDoThroughDB and kCmdFlagsUpdateCache flags is consistent with other cache-aware list commands and necessary for proper cache operation.
Line range hint 850-860: Verify cache consistency between source and destination lists
Let's verify that the cache remains consistent after rpoplpush operations.
✅ Verification successful
Cache consistency is properly maintained through the command execution stages
The code follows the established pattern for cache handling in the codebase:
- Cache operations are properly gated by
IsNeedCacheDo()and cache mode checks - Read operations check cache first via
ReadCache() - Write operations are protected by record locks before updating the DB
- Cache updates are conditional on
IsNeedUpdateCache()and occur after successful DB operations
The stage-based execution ensures that cache operations happen in the correct order during the kExecuteStage, maintaining consistency between the source and destination lists.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Search for any existing issues or tests related to rpoplpush cache consistency
# Look for related test cases
rg -A 5 "TEST.*RPopLPush.*[Cc]ache"
# Look for any reported issues with rpoplpush and cache
rg -i "rpoplpush.*cache.*inconsistent"
rg -i "cache.*inconsistent.*rpoplpush"
# Look for error handling patterns in other list commands
ast-grep --pattern 'DoUpdateCache() {
if (s_.ok()) {
$$$
}
}'
Length of output: 191
Script:
#!/bin/bash
# Let's verify the cache handling implementation in RPopLPushCmd
# Check the implementation of RPopLPushCmd
ast-grep --pattern 'class RPopLPushCmd {
$$$
}'
# Look for cache update patterns in list commands
rg -A 5 "DoUpdateCache.*List"
# Check how other list commands handle cache consistency
rg -B 2 -A 5 "cache_.*->Del.*List"
# Look for cache-related error handling in list operations
rg -A 3 "s_.ok.*cache_.*List"
Length of output: 152
Script:
#!/bin/bash
# Let's try a different approach to verify cache handling
# Look for cache-related code in the file
rg -B 2 -A 5 "cache_" src/pika_command.cc
# Check for list-specific cache operations
rg -B 2 -A 5 "cache.*List" src/pika_list.cc
# Look for general cache update patterns
ast-grep --pattern 'void DoUpdateCache() {
$$$
}'
# Check for stage-based execution patterns similar to the snippet
rg -A 5 "stage_ == kExecuteStage"
Length of output: 1419
cheniujh
changed the title
这个PR实现了cache模式下rpoplpush的逻辑，修复了 Issue #2953