/Users/deen/code/yugabyte-db/src/yb/common/common_flags.cc
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1 | | // Copyright (c) YugaByte, Inc. |
2 | | // |
3 | | // Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
4 | | // in compliance with the License. You may obtain a copy of the License at |
5 | | // |
6 | | // http://www.apache.org/licenses/LICENSE-2.0 |
7 | | // |
8 | | // Unless required by applicable law or agreed to in writing, software distributed under the License |
9 | | // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
10 | | // or implied. See the License for the specific language governing permissions and limitations |
11 | | // under the License. |
12 | | // |
13 | | |
14 | | #include "yb/common/common_flags.h" |
15 | | |
16 | | #include <thread> |
17 | | |
18 | | #include "yb/util/atomic.h" |
19 | | #include "yb/util/flag_tags.h" |
20 | | #include "yb/util/tsan_util.h" |
21 | | #include "yb/gutil/sysinfo.h" |
22 | | |
23 | | // Note that this is used by the client or master only, not by tserver. |
24 | | DEFINE_int32(yb_num_shards_per_tserver, kAutoDetectNumShardsPerTServer, |
25 | | "The default number of shards per table per tablet server when a table is created. If the " |
26 | | "value is -1, the system sets the number of shards per tserver to 1 if " |
27 | | "enable_automatic_tablet_splitting is true, and otherwise automatically determines an " |
28 | | "appropriate value based on number of CPU cores."); |
29 | | |
30 | | DEFINE_int32(ysql_num_shards_per_tserver, kAutoDetectNumShardsPerTServer, |
31 | | "The default number of shards per YSQL table per tablet server when a table is created. If the " |
32 | | "value is -1, the system sets the number of shards per tserver to 1 if " |
33 | | "enable_automatic_tablet_splitting is true, and otherwise automatically determines an " |
34 | | "appropriate value based on number of CPU cores."); |
35 | | |
36 | | DEFINE_bool(ysql_disable_index_backfill, false, |
37 | | "A kill switch to disable multi-stage backfill for YSQL indexes."); |
38 | | TAG_FLAG(ysql_disable_index_backfill, hidden); |
39 | | TAG_FLAG(ysql_disable_index_backfill, advanced); |
40 | | |
41 | | DEFINE_bool(enable_pg_savepoints, true, |
42 | | "DEPRECATED -- Set to false to disable savepoints in YugaByte PostgreSQL API."); |
43 | | TAG_FLAG(enable_pg_savepoints, hidden); |
44 | | |
45 | | DEFINE_bool(enable_automatic_tablet_splitting, true, |
46 | | "If false, disables automatic tablet splitting driven from the yb-master side."); |
47 | | |
48 | | DEFINE_bool(log_ysql_catalog_versions, false, |
49 | | "Log YSQL catalog events. For debugging purposes."); |
50 | | TAG_FLAG(log_ysql_catalog_versions, hidden); |
51 | | |
52 | | namespace yb { |
53 | | |
54 | 1.76k | static int GetYCQLNumShardsPerTServer() { |
55 | 1.76k | if (GetAtomicFlag(&FLAGS_enable_automatic_tablet_splitting)) { |
56 | 1.70k | return 1; |
57 | 1.70k | } |
58 | 53 | int value = 8; |
59 | 53 | if (IsTsan()) { |
60 | 0 | value = 2; |
61 | 53 | } else if (base::NumCPUs() <= 2) { |
62 | 0 | value = 4; |
63 | 0 | } |
64 | 53 | return value; |
65 | 53 | } |
66 | | |
67 | 1.77k | static int GetYSQLNumShardsPerTServer() { |
68 | 1.77k | if (GetAtomicFlag(&FLAGS_enable_automatic_tablet_splitting)) { |
69 | 1.71k | return 1; |
70 | 1.71k | } |
71 | 53 | int value = 8; |
72 | 53 | if (IsTsan()) { |
73 | 0 | value = 2; |
74 | 53 | } else if (base::NumCPUs() <= 2) { |
75 | 0 | value = 2; |
76 | 53 | } else if (base::NumCPUs() <= 4) { |
77 | 0 | value = 4; |
78 | 0 | } |
79 | 53 | return value; |
80 | 53 | } |
81 | | |
82 | 37.4k | void InitCommonFlags() { |
83 | 37.4k | if (GetAtomicFlag(&FLAGS_yb_num_shards_per_tserver) == kAutoDetectNumShardsPerTServer) { |
84 | 1.76k | int value = GetYCQLNumShardsPerTServer(); |
85 | 0 | VLOG(1) << "Auto setting FLAGS_yb_num_shards_per_tserver to " << value; |
86 | 1.76k | SetAtomicFlag(value, &FLAGS_yb_num_shards_per_tserver); |
87 | 1.76k | } |
88 | 37.4k | if (GetAtomicFlag(&FLAGS_ysql_num_shards_per_tserver) == kAutoDetectNumShardsPerTServer) { |
89 | 1.77k | int value = GetYSQLNumShardsPerTServer(); |
90 | 0 | VLOG(1) << "Auto setting FLAGS_ysql_num_shards_per_tserver to " << value; |
91 | 1.77k | SetAtomicFlag(value, &FLAGS_ysql_num_shards_per_tserver); |
92 | 1.77k | } |
93 | 37.4k | } |
94 | | |
95 | | } // namespace yb |