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unittest/share/test_cluster_id_hash_conflict.cpp

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+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#include "clog/ob_log_define.h"
+
+#include <gtest/gtest.h>
+
+namespace oceanbase {
+using namespace common;
+namespace unittest {
+int64_t cal_hash_v1(const uint64_t tenant_id, const common::ObAddr& addr, const int64_t cluster_id)
+{
+  // This calculation may cause hash conflicts
+  int64_t ret_hash = murmurhash(&tenant_id, sizeof(tenant_id), addr.hash());
+  ret_hash = (ret_hash | (cluster_id << 56));
+  return ret_hash;
+}
+
+int64_t cal_hash_v2(const uint64_t tenant_id, const common::ObAddr& addr, const int64_t cluster_id)
+{
+  // ObAddr.hash() only generates a 32-bit value, so the algorithm of shifting cluster_id to the left by 32 bits is
+  // effective
+  int64_t ret_hash = (addr.hash() | (cluster_id << 48));
+  ret_hash = murmurhash(&tenant_id, sizeof(tenant_id), ret_hash);
+  return ret_hash;
+}
+
+TEST(test_cluster_id_hash_conflict, test_cluster_id_hash)
+{
+  common::ObAddr addr;
+  addr.parse_from_cstring("127.0.0.1:8080");
+
+  int64_t tenant_id = 500;
+
+  // The binary of 112 and 120 are only one bit different
+  int64_t cluster_id_11 = 112;
+  int64_t cluster_id_12 = 120;
+
+  int64_t cluster_id_21 = 111;
+  int64_t cluster_id_22 = 112;
+
+  //  EXPECT_NE(cal_hash_v1(tenant_id, addr, cluster_id_11), cal_hash_v1(tenant_id, addr, cluster_id_12)); // hash
+  //  conflict
+
+  EXPECT_NE(cal_hash_v2(tenant_id, addr, cluster_id_11), cal_hash_v2(tenant_id, addr, cluster_id_12));
+  EXPECT_NE(cal_hash_v2(tenant_id, addr, cluster_id_21), cal_hash_v2(tenant_id, addr, cluster_id_22));
+
+  CLOG_LOG(INFO, "v1 ret_hash is ", "result", cal_hash_v1(tenant_id, addr, cluster_id_11));
+  CLOG_LOG(INFO, "v1 ret_hash is ", "result", cal_hash_v1(tenant_id, addr, cluster_id_12));
+  CLOG_LOG(INFO, "v1 ret_hash is ", "result", cal_hash_v1(tenant_id, addr, cluster_id_21));
+  CLOG_LOG(INFO, "v1 ret_hash is ", "result", cal_hash_v1(tenant_id, addr, cluster_id_22));
+
+  CLOG_LOG(INFO, "v2 ret_hash is ", "result", cal_hash_v2(tenant_id, addr, cluster_id_11));
+  CLOG_LOG(INFO, "v2 ret_hash is ", "result", cal_hash_v2(tenant_id, addr, cluster_id_12));
+  CLOG_LOG(INFO, "v2 ret_hash is ", "result", cal_hash_v2(tenant_id, addr, cluster_id_21));
+  CLOG_LOG(INFO, "v2 ret_hash is ", "result", cal_hash_v2(tenant_id, addr, cluster_id_22));
+}
+}  // namespace unittest
+}  // namespace oceanbase
+
+int main(int argc, char** argv)
+{
+  OB_LOGGER.set_file_name("test_cluster_id_hash_conflict.log", true);
+  OB_LOGGER.set_log_level("INFO");
+  CLOG_LOG(INFO, "begin unittest:test_cluster_id_hash_conflict");
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}