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
|
/**
* Copyright (C) 2013 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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include "mongo/db/repl/oplogreader.h"
#include "mongo/util/background.h"
namespace mongo {
class Member;
class SyncSourceFeedback : public BackgroundJob {
public:
SyncSourceFeedback() : BackgroundJob(false /*don't selfdelete*/),
_syncTarget(NULL),
_oplogReader(new OplogReader()),
_supportsUpdater(false),
_positionChanged(false),
_handshakeNeeded(false) {}
~SyncSourceFeedback() {
delete _oplogReader;
}
/// Adds an entry to _member for a secondary that has connected to us.
void associateMember(const BSONObj& id, const int memberId);
/// Ensures local.me is populated and populates it if not.
void ensureMe();
/// Passes handshake up the replication chain, upon receiving a handshake.
void forwardSlaveHandshake();
void updateSelfInMap(const OpTime& ot) {
updateMap(_me["_id"].OID(), ot);
}
/// Connect to sync target and create OplogReader if needed.
bool connect(const Member* target);
void resetConnection() {
LOG(1) << "resetting connection in sync source feedback";
_connection.reset();
}
void resetOplogReaderConnection() {
_oplogReader->resetConnection();
}
/// Used extensively in bgsync, to see if we need to use the OplogReader syncing method.
bool supportsUpdater() const {
// oplogReader will be NULL if new updater is supported
//boost::unique_lock<boost::mutex> lock(_mtx);
return _supportsUpdater;
}
/// Transfers information about a chained node's oplog position from downstream to upstream
void percolate(const mongo::OID& rid, const OpTime& ot);
/// Updates the _slaveMap to be forwarded to the sync target.
void updateMap(const mongo::OID& rid, const OpTime& ot);
std::string name() const { return "SyncSourceFeedbackThread"; }
/// Loops forever, passing updates when they are present.
void run();
/* The below methods just fall through to OplogReader and are only used when our sync target
* does not support the update command.
*/
bool connectOplogReader(const std::string& hostName) {
return _oplogReader->connect(hostName, _me);
}
bool connect(const mongo::OID& rid, const int from, const string& to) {
return _oplogReader->connect(rid, from, to);
}
void ghostQueryGTE(const char *ns, OpTime t) {
_oplogReader->ghostQueryGTE(ns, t);
}
bool haveCursor() {
return _oplogReader->haveCursor();
}
bool more() {
return _oplogReader->more();
}
bool moreInCurrentBatch() {
return _oplogReader->moreInCurrentBatch();
}
BSONObj nextSafe() {
return _oplogReader->nextSafe();
}
void tailCheck() {
_oplogReader->tailCheck();
}
void tailingQueryGTE(const char *ns, OpTime t, const BSONObj* fields=0) {
_oplogReader->tailingQueryGTE(ns, t, fields);
}
private:
/* Generally replAuthenticate will only be called within system threads to fully
* authenticate connections to other nodes in the cluster that will be used as part of
* internal operations. If a user-initiated action results in needing to call
* replAuthenticate, you can call it with skipAuthCheck set to false. Only do this if you
* are certain that the proper auth checks have already run to ensure that the user is
* authorized to do everything that this connection will be used for!
*/
bool replAuthenticate(bool skipAuthCheck);
/* Sends initialization information to our sync target, also determines whether or not they
* support the updater command.
*/
bool replHandshake();
/* Inform the sync target of our current position in the oplog, as well as the positions
* of all secondaries chained through us.
*/
bool updateUpstream();
bool hasConnection() {
return _connection.get();
}
/// Connect to sync target and create OplogReader if needed.
bool _connect(const std::string& hostName);
// stores our OID to be passed along in commands
BSONObj _me;
// the member we are currently syncing from
const Member* _syncTarget;
// holds the oplogReader for use when we fall back to old style updates
OplogReader* _oplogReader;
// our connection to our sync target
boost::scoped_ptr<DBClientConnection> _connection;
// tracks whether we are in fallback mode or not
bool _supportsUpdater;
// protects connection
boost::mutex _connmtx;
// protects cond and maps and the indicator bools
boost::mutex _mtx;
// contains the most recent optime of each member syncing to us
map<mongo::OID, OpTime> _slaveMap;
typedef map<mongo::OID, Member*> OIDMemberMap;
// contains a pointer to each member, which we can look up by oid
OIDMemberMap _members;
// used to alert our thread of changes which need to be passed up the chain
boost::condition _cond;
// used to indicate a position change which has not yet been pushed along
bool _positionChanged;
// used to indicate a connection change which has not yet been shook on
bool _handshakeNeeded;
};
}
|
