1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
// config.h
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* This file is things related to the "grid configuration":
- what machines make up the db component of our cloud
- where various ranges of things live
*/
#pragma once
#include "../db/namespace.h"
#include "../client/dbclient.h"
#include "../client/model.h"
#include "shardkey.h"
#include "shard.h"
namespace mongo {
struct ShardNS {
static string database;
static string shard;
static string chunk;
static string mongos;
static string settings;
};
class Grid;
class ConfigServer;
extern ConfigServer configServer;
extern Grid grid;
class ChunkManager;
class CollectionInfo {
public:
CollectionInfo( ShardKeyPattern _key = BSONObj() , bool _unique = false ) :
key( _key ) , unique( _unique ){}
ShardKeyPattern key;
bool unique;
};
/**
* top level grid configuration for an entire database
* TODO: use shared_ptr for ChunkManager
*/
class DBConfig : public Model {
public:
DBConfig( string name = "" ) : _name( name ) , _primary("config","") , _shardingEnabled(false){ }
string getName(){ return _name; };
/**
* @return if anything in this db is partitioned or not
*/
bool isShardingEnabled(){
return _shardingEnabled;
}
void enableSharding();
ChunkManager* shardCollection( const string& ns , ShardKeyPattern fieldsAndOrder , bool unique );
/**
* @return whether or not this partition is partitioned
*/
bool isSharded( const string& ns );
ChunkManager* getChunkManager( const string& ns , bool reload = false );
/**
* @return the correct for shard for the ns
* if the namespace is sharded, will return NULL
*/
const Shard& getShard( const string& ns );
const Shard& getPrimary(){
uassert( 8041 , (string)"no primary shard configured for db: " + _name , _primary.ok() );
return _primary;
}
void setPrimary( string s ){
_primary.reset( s );
}
bool reload();
bool dropDatabase( string& errmsg );
virtual void save( bool check=true);
virtual string modelServer();
// model stuff
virtual const char * getNS(){ return "config.databases"; }
virtual void serialize(BSONObjBuilder& to);
virtual void unserialize(const BSONObj& from);
protected:
/**
lockless
*/
bool _isSharded( const string& ns );
bool _dropShardedCollections( int& num, set<Shard>& allServers , string& errmsg );
bool doload();
/**
@return true if there was sharding info to remove
*/
bool removeSharding( const string& ns );
string _name; // e.g. "alleyinsider"
Shard _primary; // e.g. localhost , mongo.foo.com:9999
bool _shardingEnabled;
map<string,CollectionInfo> _sharded; // { "alleyinsider.blog.posts" : { ts : 1 } , ... ] - all ns that are sharded
map<string,ChunkManager*> _shards; // this will only have entries for things that have been looked at
mongo::mutex _lock; // TODO: change to r/w lock ??
friend class Grid;
friend class ChunkManager;
};
/**
* stores meta-information about the grid
* TODO: used shard_ptr for DBConfig pointers
*/
class Grid {
public:
/**
gets the config the db.
will return an empty DBConfig if not in db already
*/
DBConfig * getDBConfig( string ns , bool create=true);
/**
* removes db entry.
* on next getDBConfig call will fetch from db
*/
void removeDB( string db );
Shard pickShardForNewDB();
bool knowAboutShard( string name ) const;
unsigned long long getNextOpTime() const;
private:
map<string,DBConfig*> _databases;
mongo::mutex _lock; // TODO: change to r/w lock ??
};
class ConfigServer : public DBConfig {
public:
ConfigServer();
~ConfigServer();
bool ok(){
// TODO: check can connect
return _primary.ok();
}
virtual string modelServer(){
uassert( 10190 , "ConfigServer not setup" , _primary.ok() );
return _primary.getConnString();
}
/**
call at startup, this will initiate connection to the grid db
*/
bool init( vector<string> configHosts );
bool allUp();
bool allUp( string& errmsg );
int dbConfigVersion();
int dbConfigVersion( DBClientBase& conn );
void reloadSettings();
/**
* @return 0 = ok, otherwise error #
*/
int checkConfigVersion( bool upgrade );
/**
* log a change to config.changes
* @param what e.g. "split" , "migrate"
* @param msg any more info
*/
void logChange( const string& what , const string& ns , const BSONObj& detail = BSONObj() );
static int VERSION;
private:
string getHost( string name , bool withPort );
};
} // namespace mongo
|
