feat:add big key detection by YuCai18 · Pull Request #3115 · OpenAtomFoundation/pikiwidb

YuCai18 · 2025-06-25T08:11:55Z

新增功能 #3079:pika3.5新增大key检测及其日志写入功能

功能展示

1. info命令展示

2.大key日志写入结果展示

go测试结果

coderabbitai · 2025-06-25T08:12:18Z

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Mixficsol · 2025-07-14T07:40:42Z

+# Interval time for scanning expired big key threads.
+# Default: 1
+# When set to 0, big key logging will be disabled.
+bigkeys_log_interval : 1


这里默认改成0吧，默认不打印

Mixficsol · 2025-07-14T07:50:00Z


 Redis::~Redis() {
-  std::vector<rocksdb::ColumnFamilyHandle*> tmp_handles = handles_;
+  for (auto handle : handles_) {


这里为什么要改动

之前两个后台进程的改动遗留下来的，要重写析构函数，现在不需要了恢复到原本的代码。

Mixficsol · 2025-07-14T07:51:39Z

+    return;
+  }
+
+  std::lock_guard<std::mutex> lock(big_keys_mutex_);


这把锁是用来保护big_keys_info_map_还是bigkeys，如果是big_keys_info_map_，这里不需要用互斥锁？

这把互斥锁是用来保护 big_keys_info_map_ 的，这里不是已经加了吗？

Mixficsol · 2025-07-14T07:52:55Z

  // Data CF
  column_families.emplace_back("data_cf", data_cf_ops);
-  return rocksdb::DB::Open(db_ops, db_path, column_families, &handles_, &db_);
+  s = rocksdb::DB::Open(db_ops, db_path, column_families, &handles_, &db_);


这里为啥要改动

之前以为这里也需要调用Check函数，后面就忘记删了

Mixficsol · 2025-07-14T07:57:10Z

  }
  s = db_->Write(default_write_options_, &batch);
  UpdateSpecificKeyStatistics(key.ToString(), statistic);
+  if (s.ok()) {


这里你缺少了对已经存在的Hash类型的Key的插入统计的判断，这里的逻辑你写的是对一个新的Key的插入做大 Key 检测的判断，我理解这里是不需要的，你可以直接再 Write 之前就能判断出这个 Key 是否是大 Key 了，不需要一次额外的 Get 操作

Mixficsol · 2025-07-14T07:57:31Z

@@ -421,6 +422,15 @@ Status RedisHashes::HIncrby(const Slice& key, const Slice& field, int64_t value,
  }
  s = db_->Write(default_write_options_, &batch);
  UpdateSpecificKeyStatistics(key.ToString(), statistic);


同理 HIncrbyfloat

Mixficsol · 2025-07-14T08:00:55Z

  }
  s = db_->Write(default_write_options_, &batch);
  UpdateSpecificKeyStatistics(key.ToString(), statistic);
+  if (s.ok()) {


同理这里不需要插入之后再 Get 统计是不是大 Key, 你再调用 Write 之前就应该知道这个是不是大 Key, 你可以直接查看const Slice& key, const std::vector& fvs这两个参数

Mixficsol · 2025-07-14T08:01:03Z

    return s;
  }
-  return db_->Write(default_write_options_, &batch);
+  s = db_->Write(default_write_options_, &batch);


Mixficsol · 2025-07-21T06:22:56Z

    rescan_ = false;
    off_ = false;
    keyspace_scan_dbs_.clear();
+    info_section_ = kInfoErr;


这里在 Clear() 情况下为什么要置为 kInfoErr 状态，什么场景下这个命令会调用 Clear()

我用 kInfoErr 状态代表一个错误或者未初始化的状态。确保命令对象在被重用之前，其内部状态恢复到初始状态，防止数据污染。当一个命令执行完成后，Clear() 方法会被调用，清理内部状态，释放资源，为下次复用做准备。

Mixficsol · 2025-07-21T06:32:53Z

+void PikaServer::UpdateDBBigKeysConfig() {
+  std::shared_lock l(dbs_rw_);
+  for (const auto& db_item : dbs_) {
+    db_item.second->DBLockShared();


这里应该需要上 DBLock() 吧，写锁，因为你后面修改了 Storage 里面的值

Mixficsol · 2025-07-21T06:33:03Z

 }

+void PikaServer::UpdateDBBigKeysConfig() {
+  std::shared_lock l(dbs_rw_);


这里同理也是上写锁

这里外层保持 std::shared_lock l(dbs_rw_) 是合适的，不需要改成写锁。dbs_rw_ 保护的是 dbs_ 这个 map 容器本身的结构，在 UpdateDBBigKeysConfig() 里，我们只是遍历 dbs_，不会对容器做插入、删除或指针重排，因此只需要读锁。

db_item.second->UpdateStorageBigKeysConfig你这里不是对db_item做了更新操作吗

YuCai18: done

Mixficsol · 2025-07-21T06:36:59Z

+  thread_local uint64_t last_output_time = 0;
+  uint64_t current_time = pstd::NowMicros();
+
+  uint64_t interval_us = static_cast<uint64_t>(interval_minutes) * 60 * 1000000;


这里为什么不能把 g_pika_conf->bigkeys_log_interval() 设置成 uint64_t 类型，这里还需要强转

Mixficsol · 2025-07-21T06:41:46Z

      small_compaction_threshold_(5000),
-      small_compaction_duration_threshold_(10000) {
+      small_compaction_duration_threshold_(10000),
+      db_(nullptr),


这里为什么db_初始化是nullptr

因为在构造函数里把 db_ 初始化为 nullptr，代表此时还未打开数据库。在 rocksdb::DB::Open(ops, db_path, &db_) 中，这里才会真正 new 出 rocksdb::DB，并把指针写回 db_。之后若任何成员函数若在未调用 Open() 之前误用 db_，通过空指针检查就能及时发现问题。

Mixficsol · 2025-07-21T06:49:03Z

  // Member CF
  column_families.emplace_back("member_cf", member_cf_ops);
-  return rocksdb::DB::Open(db_ops, db_path, column_families, &handles_, &db_);
+  s = rocksdb::DB::Open(db_ops, db_path, column_families, &handles_, &db_);


Mixficsol · 2025-07-21T06:49:37Z

  // Data CF
  column_families.emplace_back("data_cf", data_cf_ops);
-  return rocksdb::DB::Open(db_ops, db_path, column_families, &handles_, &db_);
+  s = rocksdb::DB::Open(db_ops, db_path, column_families, &handles_, &db_);


这个改动有什么作用吗，都是 return s

Mixficsol · 2025-07-21T06:49:46Z

  ops.table_factory.reset(rocksdb::NewBlockBasedTableFactory(table_ops));
-
-  return rocksdb::DB::Open(ops, db_path, &db_);
+  Status s = rocksdb::DB::Open(ops, db_path, &db_);


Mixficsol · 2025-07-21T06:50:21Z

  column_families.emplace_back("data_cf", data_cf_ops);
  column_families.emplace_back("score_cf", score_cf_ops);
-  return rocksdb::DB::Open(db_ops, db_path, column_families, &handles_, &db_);
+  s = rocksdb::DB::Open(db_ops, db_path, column_families, &handles_, &db_);


Mixficsol · 2025-07-21T06:50:28Z

+  return s;
 }

+


Mixficsol · 2025-07-23T09:32:53Z

 }

+void PikaServer::UpdateDBBigKeysConfig() {
+  std::shared_lock l(dbs_rw_);


db_item.second->UpdateStorageBigKeysConfig你这里不是对db_item做了更新操作吗

YuCai18: done

Mixficsol · 2025-07-23T09:34:52Z

 		return info, nil
 	}

+	info, err := c.Info()


这里为什么要单独抽出来一个c.InfoBigKeys()的逻辑，这里可以直接写在c.Info()或者c.InfoAll()或者c.InfoNoneCommandList()里面

Mixficsol · 2025-07-23T09:35:01Z

 	return redis.String(c.conn.Do("INFO", command))
 }

+func (c *client) InfoBigKeys() (string, error) {


这个不需要

Mixficsol · 2025-07-23T09:36:37Z

 	return version, extracts, nil
 }

+func parseInfoBigkey(s string) string {


这里解析不需要单独抽出来一个函数写，你修改一下你的正则表达式即可

chejinge · 2025-12-24T07:08:48Z

#include "blackwidow/blackwidow.h"
#include
//#include
#include "src/redis_strings.h"
#include "src/redis_hashes.h"
#include "src/redis_zsets.h"
#include "src/redis_sets.h"
//#include "blackwidow/util.h"
#include "src/redis_lists.h"
#include "src/strings_value_format.h"
#include "src/base_meta_value_format.h"
#include
#include <sys/stat.h>

using namespace std;

static void Usage()
{
fprintf(stderr,
"example: pika_keys dump/20230330\n"
);
}

std::string ReplaceAll(std::string str, const std::string& from, const std::string& to) {
size_t start_pos = 0;
while((start_pos = str.find(from, start_pos)) != std::string::npos) {
str.replace(start_pos, from.length(), to);
start_pos += to.length(); // Handles case where 'to' is a substring of 'from'
}
return str;
}

bool directory_exists(const std::string& path) {
struct stat st;
return stat(path.c_str(), &st);
}

int main(int argc, char *argv[]){
if (argc < 2) {
Usage();
exit(-1);
}

std::string db_path = "";
if (argc >= 2) {
  db_path = argv[1];
}

  rocksdb::Status s;

char key_name[100];
key_name[100] = '\0';
unsigned long key_size;


//cout<< db_path <<endl;
// Init db
rocksdb::Options options;
//options.create_if_missing = true;
options.keep_log_file_num = 10;
options.max_manifest_file_size = 64 * 1024 * 1024;
options.max_log_file_size = 512 * 1024 * 1024;
options.write_buffer_size = 512 * 1024 * 1024; // 512M
options.target_file_size_base = 40 * 1024 * 1024; // 40M
options.max_open_files = 1048;  // 20M

blackwidow::BlackwidowOptions bwOptions;
bwOptions.options = options;
blackwidow::BlackWidow bw;

int64_t curtime;
rocksdb::DB* rocksDB;
rocksdb::ReadOptions iterator_options;

//strings
std::string path = db_path + "/./strings";
if (directory_exists(path) == 0) {
    blackwidow::RedisStrings stringsDB(&bw, blackwidow::kStrings);
    s = stringsDB.Open(bwOptions, path);
    rocksDB = stringsDB.GetDB();
    rocksDB->GetEnv()->GetCurrentTime(&curtime).ok();
    auto iter = rocksDB->NewIterator(iterator_options);
    for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
        blackwidow::ParsedStringsValue parsed_strings_value(iter->value());
        int32_t ttl = -1;
        int64_t ts = (int64_t)(parsed_strings_value.timestamp());
        if (ts != 0) {
            int64_t diff = ts - curtime;
            ttl = diff ;
        }
        strncpy(key_name, iter->key().ToString().c_str(), 99);
        key_size = iter->key().size() + iter->value().size();
        if (ttl < -1) continue;
        //cout <<  iter->value().size() << endl;
        //blackwidow::ParsedStringsValue parsed_strings_value(iter->value());
        //cout << "string " << iter->key().ToString().c_str() << " " << parsed_strings_value.value().ToString().c_str() << " " << iter->key().size() + iter->value().size() << " " << ttl << endl;
        //cout << "string " << iter->key().size() + iter->value().size() << " " << iter->key().ToString().c_str() << " " << iter->key().size() + iter->value().size() << " " << ttl << endl;
        //std::string k = std::regex_replace(iter->key().ToString().c_str(), std::regex(R"(\n)"), "\\n");
        std::string key_str =  ReplaceAll(iter->key().ToString(), "\n", "\\n");
        key_str =  ReplaceAll(key_str, " ", "\\x20");
        cout << "string " << iter->key().size() + iter->value().size() << " " << key_str << " "  << ttl << endl;
     //printf("[key : %-30s] [value : %-30s] [timestamp : %-10d] [version : %d] [survival_time : %d]\n",
     //  iter->key().ToString().c_str(),
     //  parsed_strings_value.value().ToString().c_str(),
     //  parsed_strings_value.timestamp(),
     //  parsed_strings_value.version(),
     //  ttl);
    }
}

path = db_path + "/./hashes";
if (directory_exists(path) == 0) {
    blackwidow::RedisHashes hashesDB(&bw, blackwidow::kHashes);
    s = hashesDB.Open(bwOptions, path);
    rocksdb::Env::Default()->GetCurrentTime(&curtime);

    rocksDB = hashesDB.GetDB();
    auto iter = rocksDB->NewIterator(iterator_options);
    for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
        //blackwidow::ParsedStringsValue parsed_strings_value(iter->value());
        blackwidow::ParsedHashesMetaValue parsed_hashes_meta_value(iter->value());
        int64_t left = -1;
        int64_t sum = 0;
        std::string k = iter->key().ToString();
        sum = sum + k.size() + 12;
        std::vector<blackwidow::FieldValue> fvs;
        blackwidow::Status s = hashesDB.HGetall(k, &fvs);
        for (auto it = fvs.begin(); it != fvs.end(); it ++) {
            //cout<<"filed:" << it->field.size() <<endl;
            //cout<<"value:" << it->value.size() <<endl;
            sum = sum + 4 + k.size() + 4 + it->field.size();
            sum = sum + it->value.size();
        }
        if (parsed_hashes_meta_value.IsStale() || parsed_hashes_meta_value.count() == 0) {
        } else {
            if (!parsed_hashes_meta_value.IsPermanentSurvival()) {
                left = parsed_hashes_meta_value.timestamp() - curtime;
                if (left <= 0) left = -2;
            }
            std::string key_str =  ReplaceAll(iter->key().ToString(), "\n", "\\n");
            key_str =  ReplaceAll(key_str, " ", "\\x20");
            std::cout << "hash " << sum << " " << key_str.c_str() << " " << left << std::endl;
        }
    }

}

std::string start_key;
////std::string start_key = "llm";
std::string next_key;
std::string pattern("*");
int64_t batch_count = 1000;
bool fin = false;
//while (!fin) {
//  int64_t count = batch_count;
//  std::vector<std::string> keys;
//  fin = hashesDB.Scan(start_key, pattern, &keys, &count, &next_key);
//  start_key = next_key;

//  //cout<< keys.size() <<endl;
//  for (auto k : keys) {
//      //cout<<"k:" << k <<endl;
//      int64_t sum = 0;
//      sum = sum + k.size() + 12;
//      std::vector<blackwidow::FieldValue> fvs;
//      blackwidow::Status s = hashesDB.HGetall(k, &fvs);
//      for (auto it = fvs.begin(); it != fvs.end(); it ++) {
//          //cout<<"filed:" << it->field.size() <<endl;
//          //cout<<"value:" << it->value.size() <<endl;
//          sum = sum + 4 + k.size() + 4 + it->field.size();
//          sum = sum + it->value.size();
//      }
//      int64_t ttl = -1;
//      hashesDB.TTL(k, &ttl);
//      //cout<<"ttl:" << ttl <<endl;
//    strncpy(key_name, k.c_str(), 99);
//    key_size = sum;
//    if (display == 1) {
//        //cout<< "hash " << k << " " << sum << " " << ttl <<endl;
//        cout<< "hash " << sum << " " << ReplaceAll(k, "\n", "\\n") << " " << ttl <<endl;
//    }else{
//        perfix_add_key(key_name, key_size, 1);
//    }
//  }
//  //return 0;
//}

path = db_path + "/./zsets";
if (directory_exists(path) == 0) {
    blackwidow::RedisZSets zsetsDB(&bw, blackwidow::kZSets);
    s = zsetsDB.Open(bwOptions, path);

    start_key.clear();
    next_key.clear();
    fin = false;

    while (!fin) {
      int64_t count = batch_count;
      std::vector<std::string> keys;
      fin = zsetsDB.Scan(start_key, pattern, &keys, &count, &next_key);
      start_key = next_key;

        for (auto k : keys) {
        //cout<<"k:" << k <<endl;
        int64_t sum = 0;
        sum = sum + k.size() + 12;
        std::vector<blackwidow::ScoreMember> score_members;
        blackwidow::Status s = zsetsDB.ZRange(k, 0, -1, &score_members);
        auto it = score_members.begin();
        for (auto it = score_members.begin(); it != score_members.end(); it ++) {
              sum = sum + (4 + k.size() + 4 + it->member.size() + 8) * 2;
            //cout<<"score:" << std::to_string(it->score) <<endl;
            //cout<<"member:" << it->member <<endl;
        }

        int64_t ttl = -1;
        s = zsetsDB.TTL(k, &ttl);

        strncpy(key_name, k.c_str(), 99);
        key_size = sum;
        cout<< "zset " << sum << " " << ReplaceAll(k, "\n", "\\n") << " " << ttl <<endl;
      }
    }
}

path = db_path + "/./sets";
if (directory_exists(path) == 0) {
    blackwidow::RedisSets setsDB(&bw, blackwidow::kSets);
    s = setsDB.Open(bwOptions, path);

    start_key.clear();
    next_key.clear();
    fin = false;

    while (!fin) {
      int64_t count = batch_count;
      std::vector<std::string> keys;
      fin = setsDB.Scan(start_key, pattern, &keys, &count, &next_key);
      start_key = next_key;

        for (auto k : keys) {
            //cout<<"k:" << k <<endl;
            int64_t sum = 0;
            sum = sum + k.size() + 12;
            std::vector<std::string> members;
            blackwidow::Status s = setsDB.SMembers(k, &members);
            for (auto it = members.begin(); it != members.end(); it ++) {
                //cout<<"member:" << *it <<endl;
                sum = sum + 4 + k.size() + 4 + (*it).size();
            }

            int64_t ttl = -1;
            s = setsDB.TTL(k, &ttl);

            strncpy(key_name, k.c_str(), 99);
            key_size = sum;
                //cout<< "set " << k << " " << sum << " " << ttl <<endl;
                cout<< "set " << sum << " " << ReplaceAll(k, "\n", "\\n") << " " << ttl <<endl;
       }
    }
  }

path = db_path + "/./lists";
if (directory_exists(path) == 0) {
blackwidow::RedisLists listsDB(&bw, blackwidow::kLists);
s = listsDB.Open(bwOptions, path);

    start_key.clear();
    next_key.clear();
    fin = false;

    while (!fin) {
      int64_t count = batch_count;
      std::vector<std::string> keys;
      fin = listsDB.Scan(start_key, pattern, &keys, &count, &next_key);
      start_key = next_key;

      for (auto k : keys) {
         //cout<<"k:" << k <<endl;
         int64_t sum = 0;
         sum = sum + k.size() + 12 + 16;
         int64_t pos = 0;
         std::vector<std::string> list;
         blackwidow::Status s = listsDB.LRange(k, pos, pos + batch_count - 1, &list);
         while (s.ok() && !list.empty()) {

           for (auto e : list) {
               //cout<<"e:" << e <<endl;
               sum = sum + 4 + k.size() + 4 + 8 + e.size();
           }

           pos += batch_count;
           list.clear();
           s = listsDB.LRange(k, pos, pos + batch_count - 1, &list);
         }

         int64_t ttl = -1;
         s = listsDB.TTL(k, &ttl);

         strncpy(key_name, k.c_str(), 99);
         key_size = sum;
         cout<< "list " << sum << " " << ReplaceAll(k, "\n", "\\n") << " " << ttl <<endl;
      }
    }

}

}

github-actions Bot added the ✏️ Feature New feature or request label Jun 25, 2025

YuCai18 force-pushed the codereview3.5/bigkey branch 28 times, most recently from 8212d18 to fb563a7 Compare June 30, 2025 12:31

YuCai18 force-pushed the codereview3.5/bigkey branch 20 times, most recently from 8b7dc3a to aee8840 Compare July 4, 2025 07:18

add big key detection

71e92ec

Mixficsol reviewed Jul 14, 2025

View reviewed changes

Fixed bugs in reviewed code

b42bb46

Mixficsol reviewed Jul 21, 2025

View reviewed changes

Fix bugs after the second review

f32c280

Mixficsol reviewed Jul 23, 2025

View reviewed changes

Fix bugs after the third review

d920126

Mixficsol approved these changes Aug 1, 2025

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YuCai18 commented Jun 25, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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新增功能 #3079:pika3.5新增大key检测及其日志写入功能

功能展示

1. info命令展示

2.大key日志写入结果展示

go测试结果

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coderabbitai Bot commented Jun 25, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Mixficsol Jul 23, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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YuCai18 commented Jun 25, 2025 •

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coderabbitai Bot commented Jun 25, 2025 •

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Mixficsol Jul 23, 2025 •

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