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
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
/*
* Copyright (C) 2010 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/>.
*/
// stragegy.cpp
#include "pch.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 , const Shard& shard ){
ShardConnection conn( shard , r.getns() );
conn->say( r.m() );
conn.done();
}
void Strategy::doQuery( Request& r , const Shard& shard ){
try{
ShardConnection dbcon( shard , r.getns() );
DBClientBase &c = dbcon.conn();
Message response;
bool ok = c.call( r.m(), response);
{
QueryResult *qr = (QueryResult *) response.singleData();
if ( qr->resultFlags() & ResultFlag_ShardConfigStale ){
dbcon.done();
throw StaleConfigException( r.getns() , "Strategy::doQuery" );
}
}
uassert( 10200 , "mongos: error calling db", ok);
r.reply( response , c.getServerAddress() );
dbcon.done();
}
catch ( AssertionException& e ) {
BSONObjBuilder err;
e.getInfo().append( err );
BSONObj errObj = err.done();
replyToQuery(ResultFlag_ErrSet, r.p() , r.m() , errObj);
}
}
void Strategy::insert( const Shard& shard , const char * ns , const BSONObj& obj ){
ShardConnection dbcon( shard , ns );
if ( dbcon.setVersion() ){
dbcon.done();
throw StaleConfigException( ns , "for insert" );
}
dbcon->insert( ns , obj );
dbcon.done();
}
map< pair<DBClientBase*,string> ,unsigned long long> checkShardVersionLastSequence;
class WriteBackListener : public BackgroundJob {
protected:
string name() { return "WriteBackListener"; }
WriteBackListener( const string& addr ) : _addr( addr ){
log() << "creating WriteBackListener for: " << addr << endl;
}
void run(){
int secsToSleep = 0;
while ( Shard::isMember( _addr ) ){
try {
ScopedDbConnection conn( _addr );
BSONObj result;
{
BSONObjBuilder cmd;
cmd.appendOID( "writebacklisten" , &serverID ); // Command will block for data
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.header()->valid() );
DBConfigPtr db = grid.getDBConfig( ns );
ShardChunkVersion needVersion( data["version"] );
log(1) << "writeback needVersion : " << needVersion.toString() << " mine : " << db->getChunkManager( ns )->getVersion().toString() << endl;// TODO change to log(3)
if ( needVersion.isSet() && needVersion <= db->getChunkManager( ns )->getVersion() ){
// this means when the write went originally, the version was old
// if we're here, it means we've already updated the config, so don't need to do again
db->getChunkManager( ns , true ); // TEMP TEMP TEMP ERH
}
else {
db->getChunkManager( ns , true );
}
Request r( m , 0 );
r.process();
}
else {
log() << "unknown writeBack result: " << result << endl;
}
conn.done();
secsToSleep = 0;
continue;
}
catch ( std::exception e ){
log() << "WriteBackListener exception : " << e.what() << endl;
// It's possible this shard was removed
Shard::reloadShardInfo();
}
catch ( ... ){
log() << "WriteBackListener uncaught exception!" << endl;
}
secsToSleep++;
sleepsecs(secsToSleep);
if ( secsToSleep > 10 )
secsToSleep = 0;
}
log() << "WriteBackListener exiting : address no longer in cluster " << _addr;
}
private:
string _addr;
static map<string,WriteBackListener*> _cache;
static mongo::mutex _lock;
public:
static void init( DBClientBase& conn ){
scoped_lock lk( _lock );
WriteBackListener*& l = _cache[conn.getServerAddress()];
if ( l )
return;
l = new WriteBackListener( conn.getServerAddress() );
l->go();
}
};
map<string,WriteBackListener*> WriteBackListener::_cache;
mongo::mutex WriteBackListener::_lock("WriteBackListener");
/**
* @return true if had to do something
*/
bool checkShardVersion( DBClientBase& conn , const string& ns , bool authoritative , int tryNumber ){
// TODO: cache, optimize, etc...
WriteBackListener::init( conn );
DBConfigPtr conf = grid.getDBConfig( ns );
if ( ! conf )
return false;
ShardChunkVersion version = 0;
unsigned long long officialSequenceNumber = 0;
ChunkManagerPtr manager;
const bool isSharded = conf->isSharded( ns );
if ( isSharded ){
manager = conf->getChunkManager( ns , authoritative );
officialSequenceNumber = manager->getSequenceNumber();
}
unsigned long long & sequenceNumber = checkShardVersionLastSequence[ make_pair(&conn,ns) ];
if ( sequenceNumber == officialSequenceNumber )
return false;
if ( isSharded ){
version = manager->getVersion( Shard::make( conn.getServerAddress() ) );
}
log(2) << " have to set shard version for conn: " << &conn << " ns:" << ns
<< " my last seq: " << sequenceNumber << " current: " << officialSequenceNumber
<< " version: " << version << " manager: " << manager.get()
<< endl;
BSONObj result;
if ( setShardVersion( conn , ns , version , authoritative , result ) ){
// success!
log(1) << " setShardVersion success!" << endl;
sequenceNumber = officialSequenceNumber;
dassert( sequenceNumber == checkShardVersionLastSequence[ make_pair(&conn,ns) ] );
return true;
}
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 , tryNumber + 1 );
return true;
}
if ( tryNumber < 4 ){
log(1) << "going to retry checkShardVersion" << endl;
sleepmillis( 10 );
checkShardVersion( conn , ns , 1 , tryNumber + 1 );
return true;
}
log() << " setShardVersion failed: " << result << endl;
massert( 10429 , (string)"setShardVersion failed! " + result.jsonString() , 0 );
return true;
}
}
|
