[improve](cloud) Report read/write conflict range

cloud/src/meta-store/txn_kv.cpp

@@ -944,6 +944,94 @@ TxnErrorCode Transaction::get_conflicting_range(
     return TxnErrorCode::TXN_OK;
 }
 
+TxnErrorCode Transaction::get_read_conflict_range(
+        std::vector<std::pair<std::string, std::string>>* values) {
+    constexpr std::string_view start = "\xff\xff/transaction/read_conflict_range/";
+    constexpr std::string_view end = "\xff\xff/transaction/read_conflict_range/\xff";
+
+    int limit = 0;
+    int target_bytes = 0;
+    FDBStreamingMode mode = FDB_STREAMING_MODE_WANT_ALL;
+    int iteration = 0;
+    fdb_bool_t snapshot = 0;
+    fdb_bool_t reverse = 0;
+    FDBFuture* future = fdb_transaction_get_range(
+            txn_, FDB_KEYSEL_FIRST_GREATER_OR_EQUAL((uint8_t*)start.data(), start.size()),
+            FDB_KEYSEL_FIRST_GREATER_OR_EQUAL((uint8_t*)end.data(), end.size()), limit,
+            target_bytes, mode, iteration, snapshot, reverse);
+
+    DORIS_CLOUD_DEFER {
+        fdb_future_destroy(future);
+    };
+
+    RETURN_IF_ERROR(await_future(future));
+
+    FDBKeyValue const* out_kvs;
+    int out_kvs_count;
+    fdb_bool_t out_more;
+    do {
+        fdb_error_t err =
+                fdb_future_get_keyvalue_array(future, &out_kvs, &out_kvs_count, &out_more);
+        if (err) {
+            LOG(WARNING) << "get_conflicting_range get keyvalue array error: "
+                         << fdb_get_error(err);
+            return cast_as_txn_code(err);
+        }
+        for (int i = 0; i < out_kvs_count; i++) {
+            std::string_view key((char*)out_kvs[i].key, out_kvs[i].key_length);
+            std::string_view value((char*)out_kvs[i].value, out_kvs[i].value_length);
+            key.remove_prefix(start.size());
+            values->emplace_back(key, value);
+        }
+    } while (out_more);
+
+    return TxnErrorCode::TXN_OK;
+}
+
+TxnErrorCode Transaction::get_write_conflict_range(
+        std::vector<std::pair<std::string, std::string>>* values) {
+    constexpr std::string_view start = "\xff\xff/transaction/write_conflict_range/";
+    constexpr std::string_view end = "\xff\xff/transaction/write_conflict_range/\xff";
+
+    int limit = 0;
+    int target_bytes = 0;
+    FDBStreamingMode mode = FDB_STREAMING_MODE_WANT_ALL;
+    int iteration = 0;
+    fdb_bool_t snapshot = 0;
+    fdb_bool_t reverse = 0;
+    FDBFuture* future = fdb_transaction_get_range(
+            txn_, FDB_KEYSEL_FIRST_GREATER_OR_EQUAL((uint8_t*)start.data(), start.size()),
+            FDB_KEYSEL_FIRST_GREATER_OR_EQUAL((uint8_t*)end.data(), end.size()), limit,
+            target_bytes, mode, iteration, snapshot, reverse);
+
+    DORIS_CLOUD_DEFER {
+        fdb_future_destroy(future);
+    };
+
+    RETURN_IF_ERROR(await_future(future));
+
+    FDBKeyValue const* out_kvs;
+    int out_kvs_count;
+    fdb_bool_t out_more;
+    do {
+        fdb_error_t err =
+                fdb_future_get_keyvalue_array(future, &out_kvs, &out_kvs_count, &out_more);
+        if (err) {
+            LOG(WARNING) << "get_conflicting_range get keyvalue array error: "
+                         << fdb_get_error(err);
+            return cast_as_txn_code(err);
+        }
+        for (int i = 0; i < out_kvs_count; i++) {
+            std::string_view key((char*)out_kvs[i].key, out_kvs[i].key_length);
+            std::string_view value((char*)out_kvs[i].value, out_kvs[i].value_length);
+            key.remove_prefix(start.size());
+            values->emplace_back(key, value);
+        }
+    } while (out_more);
+
+    return TxnErrorCode::TXN_OK;
+}
+
 TxnErrorCode Transaction::report_conflicting_range() {
     if (!config::enable_logging_conflict_keys) {
         return TxnErrorCode::TXN_OK;
@@ -969,7 +1057,45 @@ TxnErrorCode Transaction::report_conflicting_range() {
         out += fmt::format("[{}, {}): {}", hex(start), hex(end), conflict_count);
     }
 
-    LOG(WARNING) << "conflicting key ranges: " << out;
+    key_values.clear();
+    RETURN_IF_ERROR(get_read_conflict_range(&key_values));
+    if (key_values.size() % 2 != 0) {
+        LOG(WARNING) << "the read conflict range is not well-formed, size=" << key_values.size();
+        return TxnErrorCode::TXN_INVALID_DATA;
+    }
+    std::string read_conflict_range_out;
+    for (size_t i = 0; i < key_values.size(); i += 2) {
+        std::string_view start = key_values[i].first;
+        std::string_view end = key_values[i + 1].first;
+        std::string_view conflict_count = key_values[i].second;
+        if (!read_conflict_range_out.empty()) {
+            read_conflict_range_out += ", ";
+        }
+        read_conflict_range_out +=
+                fmt::format("[{}, {}): {}", hex(start), hex(end), conflict_count);
+    }
+
+    key_values.clear();
+    RETURN_IF_ERROR(get_write_conflict_range(&key_values));
+    if (key_values.size() % 2 != 0) {
+        LOG(WARNING) << "the write conflict range is not well-formed, size=" << key_values.size();
+        return TxnErrorCode::TXN_INVALID_DATA;
+    }
+    std::string write_conflict_range_out;
+    for (size_t i = 0; i < key_values.size(); i += 2) {
+        std::string_view start = key_values[i].first;
+        std::string_view end = key_values[i + 1].first;
+        std::string_view conflict_count = key_values[i].second;
+        if (!write_conflict_range_out.empty()) {
+            write_conflict_range_out += ", ";
+        }
+        write_conflict_range_out +=
+                fmt::format("[{}, {}): {}", hex(start), hex(end), conflict_count);
+    }
+
+    LOG(WARNING) << "conflicting key ranges: " << out
+                 << ", read conflict range: " << read_conflict_range_out
+                 << ", write conflict range: " << write_conflict_range_out;
 
     return TxnErrorCode::TXN_OK;
 }

cloud/src/meta-store/txn_kv.h

@@ -841,6 +841,10 @@ class Transaction : public cloud::Transaction {
     // It only works when the report_conflicting_ranges option is enabled.
     TxnErrorCode get_conflicting_range(
             std::vector<std::pair<std::string, std::string>>* key_values);
+    TxnErrorCode get_read_conflict_range(
+            std::vector<std::pair<std::string, std::string>>* key_values);
+    TxnErrorCode get_write_conflict_range(
+            std::vector<std::pair<std::string, std::string>>* key_values);
     TxnErrorCode report_conflicting_range();
 
     std::shared_ptr<Database> db_ {nullptr};