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/* @file rs_initiate.cpp
*/
/**
* 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/>.
*/
#include "pch.h"
#include "../cmdline.h"
#include "../commands.h"
#include "../../util/mmap.h"
#include "../../util/mongoutils/str.h"
#include "health.h"
#include "rs.h"
#include "rs_config.h"
#include "../dbhelpers.h"
using namespace bson;
using namespace mongoutils;
namespace mongo {
/* called on a reconfig AND on initiate
throws
@param initial true when initiating
*/
void checkMembersUpForConfigChange(const ReplSetConfig& cfg, bool initial) {
int failures = 0;
int me = 0;
for( vector<ReplSetConfig::MemberCfg>::const_iterator i = cfg.members.begin(); i != cfg.members.end(); i++ ) {
if( i->h.isSelf() ) {
me++;
if( !i->potentiallyHot() ) {
uasserted(13420, "initiation and reconfiguration of a replica set must be sent to a node that can become primary");
}
}
}
uassert(13278, "bad config - dups?", me <= 1); // dups?
uassert(13279, "can't find self in the replset config", me == 1);
for( vector<ReplSetConfig::MemberCfg>::const_iterator i = cfg.members.begin(); i != cfg.members.end(); i++ ) {
BSONObj res;
{
bool ok = false;
try {
int theirVersion = -1000;
ok = requestHeartbeat(cfg._id, "", i->h.toString(), res, -1, theirVersion, initial/*check if empty*/);
if( theirVersion >= cfg.version ) {
stringstream ss;
ss << "replSet member " << i->h.toString() << " has too new a config version (" << theirVersion << ") to reconfigure";
uasserted(13259, ss.str());
}
}
catch(DBException& e) {
log() << "replSet cmufcc requestHeartbeat " << i->h.toString() << " : " << e.toString() << rsLog;
}
catch(...) {
log() << "replSet cmufcc error exception in requestHeartbeat?" << rsLog;
}
if( res.getBoolField("mismatch") )
uasserted(13145, "set name does not match the set name host " + i->h.toString() + " expects");
if( *res.getStringField("set") ) {
if( cfg.version <= 1 ) {
// this was to be initiation, no one shoudl be initiated already.
uasserted(13256, "member " + i->h.toString() + " is already initiated");
}
else {
// Assure no one has a newer config.
if( res["v"].Int() >= cfg.version ) {
uasserted(13341, "member " + i->h.toString() + " has a config version >= to the new cfg version; cannot change config");
}
}
}
if( !ok && !res["rs"].trueValue() ) {
if( !res.isEmpty() ) {
/* strange. got a response, but not "ok". log it. */
log() << "replSet warning " << i->h.toString() << " replied: " << res.toString() << rsLog;
}
bool allowFailure = false;
failures++;
if( res.isEmpty() && !initial && failures == 1 ) {
/* for now we are only allowing 1 node to be down on a reconfig. this can be made to be a minority
trying to keep change small as release is near.
*/
const Member* m = theReplSet->findById( i->_id );
if( m ) {
// ok, so this was an existing member (wouldn't make sense to add to config a new member that is down)
assert( m->h().toString() == i->h.toString() );
allowFailure = true;
}
}
if( !allowFailure ) {
string msg = string("need members up to initiate, not ok : ") + i->h.toString();
if( !initial )
msg = string("need most members up to reconfigure, not ok : ") + i->h.toString();
uasserted(13144, msg);
}
}
}
if( initial ) {
bool hasData = res["hasData"].Bool();
uassert(13311, "member " + i->h.toString() + " has data already, cannot initiate set. All members except initiator must be empty.",
!hasData || i->h.isSelf());
}
}
}
class CmdReplSetInitiate : public ReplSetCommand {
public:
virtual LockType locktype() const { return NONE; }
CmdReplSetInitiate() : ReplSetCommand("replSetInitiate") { }
virtual void help(stringstream& h) const {
h << "Initiate/christen a replica set.";
h << "\nhttp://www.mongodb.org/display/DOCS/Replica+Set+Commands";
}
virtual bool run(const string& , BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
log() << "replSet replSetInitiate admin command received from client" << rsLog;
if( !replSet ) {
errmsg = "server is not running with --replSet";
return false;
}
if( theReplSet ) {
errmsg = "already initialized";
result.append("info", "try querying " + rsConfigNs + " to see current configuration");
return false;
}
{
// just make sure we can get a write lock before doing anything else. we'll reacquire one
// later. of course it could be stuck then, but this check lowers the risk if weird things
// are up.
time_t t = time(0);
writelock lk("");
if( time(0)-t > 10 ) {
errmsg = "took a long time to get write lock, so not initiating. Initiate when server less busy?";
return false;
}
/* check that we don't already have an oplog. that could cause issues.
it is ok if the initiating member has *other* data than that.
*/
BSONObj o;
if( Helpers::getFirst(rsoplog, o) ) {
errmsg = rsoplog + string(" is not empty on the initiating member. cannot initiate.");
return false;
}
}
if( ReplSet::startupStatus == ReplSet::BADCONFIG ) {
errmsg = "server already in BADCONFIG state (check logs); not initiating";
result.append("info", ReplSet::startupStatusMsg);
return false;
}
if( ReplSet::startupStatus != ReplSet::EMPTYCONFIG ) {
result.append("startupStatus", ReplSet::startupStatus);
errmsg = "all members and seeds must be reachable to initiate set";
result.append("info", cmdLine._replSet);
return false;
}
BSONObj configObj;
if( cmdObj["replSetInitiate"].type() != Object ) {
result.append("info2", "no configuration explicitly specified -- making one");
log() << "replSet info initiate : no configuration specified. Using a default configuration for the set" << rsLog;
string name;
vector<HostAndPort> seeds;
set<HostAndPort> seedSet;
parseReplsetCmdLine(cmdLine._replSet, name, seeds, seedSet); // may throw...
bob b;
b.append("_id", name);
bob members;
members.append("0", BSON( "_id" << 0 << "host" << HostAndPort::Me().toString() ));
for( unsigned i = 0; i < seeds.size(); i++ )
members.append(bob::numStr(i+1), BSON( "_id" << i+1 << "host" << seeds[i].toString()));
b.appendArray("members", members.obj());
configObj = b.obj();
log() << "replSet created this configuration for initiation : " << configObj.toString() << rsLog;
}
else {
configObj = cmdObj["replSetInitiate"].Obj();
}
bool parsed = false;
try {
ReplSetConfig newConfig(configObj);
parsed = true;
if( newConfig.version > 1 ) {
errmsg = "can't initiate with a version number greater than 1";
return false;
}
log() << "replSet replSetInitiate config object parses ok, " << newConfig.members.size() << " members specified" << rsLog;
checkMembersUpForConfigChange(newConfig, true);
log() << "replSet replSetInitiate all members seem up" << rsLog;
writelock lk("");
bo comment = BSON( "msg" << "initiating set");
newConfig.saveConfigLocally(comment);
log() << "replSet replSetInitiate config now saved locally. Should come online in about a minute." << rsLog;
result.append("info", "Config now saved locally. Should come online in about a minute.");
ReplSet::startupStatus = ReplSet::SOON;
ReplSet::startupStatusMsg = "Received replSetInitiate - should come online shortly.";
}
catch( DBException& e ) {
log() << "replSet replSetInitiate exception: " << e.what() << rsLog;
if( !parsed )
errmsg = string("couldn't parse cfg object ") + e.what();
else
errmsg = string("couldn't initiate : ") + e.what();
return false;
}
return true;
}
} cmdReplSetInitiate;
}
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