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
221
|
// stragegy.cpp
#include "stdafx.h"
#include "request.h"
#include "../util/background.h"
#include "../client/connpool.h"
#include "../db/commands.h"
#include "server.h"
namespace mongo {
// ----- Strategy ------
void Strategy::doWrite( int op , Request& r , string server ){
ScopedDbConnection dbcon( server );
DBClientBase &_c = dbcon.conn();
/* TODO FIX - do not case and call DBClientBase::say() */
DBClientConnection&c = dynamic_cast<DBClientConnection&>(_c);
c.port().say( r.m() );
dbcon.done();
}
void Strategy::doQuery( Request& r , string server ){
try{
ScopedDbConnection dbcon( server );
DBClientBase &_c = dbcon.conn();
checkShardVersion( _c , r.getns() );
// TODO: This will not work with Paired connections. Fix.
DBClientConnection&c = dynamic_cast<DBClientConnection&>(_c);
Message response;
bool ok = c.port().call( r.m(), response);
{
QueryResult *qr = (QueryResult *) response.data;
if ( qr->resultFlags() & QueryResult::ResultFlag_ShardConfigStale ){
dbcon.done();
throw StaleConfigException( r.getns() , "Strategy::doQuery" );
}
}
uassert( 10200 , "mongos: error calling db", ok);
r.reply( response );
dbcon.done();
}
catch ( AssertionException& e ) {
BSONObjBuilder err;
err.append("$err", string("mongos: ") + (e.msg.empty() ? "assertion during query" : e.msg));
BSONObj errObj = err.done();
replyToQuery(QueryResult::ResultFlag_ErrSet, r.p() , r.m() , errObj);
}
}
void Strategy::insert( string server , const char * ns , const BSONObj& obj ){
ScopedDbConnection dbcon( server );
checkShardVersion( dbcon.conn() , ns );
dbcon->insert( ns , obj );
dbcon.done();
}
map<DBClientBase*,unsigned long long> checkShardVersionLastSequence;
class WriteBackListener : public BackgroundJob {
protected:
WriteBackListener( const string& addr ) : _addr( addr ){
cout << "creating WriteBackListener for: " << addr << endl;
}
void run(){
int secsToSleep = 0;
while ( 1 ){
try {
ScopedDbConnection conn( _addr );
BSONObj result;
{
BSONObjBuilder cmd;
cmd.appendOID( "writebacklisten" , &serverID );
if ( ! conn->runCommand( "admin" , cmd.obj() , result ) ){
log() << "writebacklisten command failed! " << result << endl;
conn.done();
continue;
}
}
log(1) << "writebacklisten result: " << result << endl;
BSONObj data = result.getObjectField( "data" );
if ( data.getBoolField( "writeBack" ) ){
string ns = data["ns"].valuestrsafe();
int len;
Message m( (void*)data["msg"].binData( len ) , false );
massert( 10427 , "invalid writeback message" , m.data->valid() );
grid.getDBConfig( ns )->getChunkManager( ns , true );
Request r( m , 0 );
r.process();
}
else {
log() << "unknown writeBack result: " << result << endl;
}
conn.done();
secsToSleep = 0;
}
catch ( std::exception e ){
log() << "WriteBackListener exception : " << e.what() << endl;
}
catch ( ... ){
log() << "WriteBackListener uncaught exception!" << endl;
}
secsToSleep++;
sleepsecs(secsToSleep);
if ( secsToSleep > 10 )
secsToSleep = 0;
}
}
private:
string _addr;
static map<string,WriteBackListener*> _cache;
public:
static void init( DBClientBase& conn ){
WriteBackListener*& l = _cache[conn.getServerAddress()];
if ( l )
return;
l = new WriteBackListener( conn.getServerAddress() );
l->go();
}
};
map<string,WriteBackListener*> WriteBackListener::_cache;
void checkShardVersion( DBClientBase& conn , const string& ns , bool authoritative ){
// TODO: cache, optimize, etc...
WriteBackListener::init( conn );
DBConfig * conf = grid.getDBConfig( ns );
if ( ! conf )
return;
ShardChunkVersion version = 0;
unsigned long long officialSequenceNumber = 0;
if ( conf->isSharded( ns ) ){
ChunkManager * manager = conf->getChunkManager( ns , authoritative );
officialSequenceNumber = manager->getSequenceNumber();
version = manager->getVersion( conn.getServerAddress() );
}
unsigned long long & sequenceNumber = checkShardVersionLastSequence[ &conn ];
if ( officialSequenceNumber == sequenceNumber )
return;
log(2) << " have to set shard version for conn: " << &conn << " ns:" << ns << " my last seq: " << sequenceNumber << " current: " << officialSequenceNumber << endl;
BSONObj result;
if ( setShardVersion( conn , ns , version , authoritative , result ) ){
// success!
log(1) << " setShardVersion success!" << endl;
sequenceNumber = officialSequenceNumber;
return;
}
log(1) << " setShardVersion failed!\n" << result << endl;
if ( result.getBoolField( "need_authoritative" ) )
massert( 10428 , "need_authoritative set but in authoritative mode already" , ! authoritative );
if ( ! authoritative ){
checkShardVersion( conn , ns , 1 );
return;
}
log(1) << " setShardVersion failed: " << result << endl;
massert( 10429 , "setShardVersion failed!" , 0 );
}
bool setShardVersion( DBClientBase & conn , const string& ns , ShardChunkVersion version , bool authoritative , BSONObj& result ){
BSONObjBuilder cmdBuilder;
cmdBuilder.append( "setShardVersion" , ns.c_str() );
cmdBuilder.append( "configdb" , configServer.modelServer() );
cmdBuilder.appendTimestamp( "version" , version );
cmdBuilder.appendOID( "serverID" , &serverID );
if ( authoritative )
cmdBuilder.appendBool( "authoritative" , 1 );
BSONObj cmd = cmdBuilder.obj();
log(1) << " setShardVersion " << conn.getServerAddress() << " " << ns << " " << cmd << " " << &conn << endl;
return conn.runCommand( "admin" , cmd , result );
}
bool lockNamespaceOnServer( const string& server , const string& ns ){
ScopedDbConnection conn( server );
bool res = lockNamespaceOnServer( conn.conn() , ns );
conn.done();
return res;
}
bool lockNamespaceOnServer( DBClientBase& conn , const string& ns ){
BSONObj lockResult;
return setShardVersion( conn , ns , grid.getNextOpTime() , true , lockResult );
}
}
|
