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/* @file manager.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,b
* 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 "rs.h"
#include "../client.h"
namespace mongo {
enum {
NOPRIMARY = -2,
SELFPRIMARY = -1
};
/* check members OTHER THAN US to see if they think they are primary */
const Member * Manager::findOtherPrimary(bool& two) {
two = false;
Member *m = rs->head();
Member *p = 0;
while( m ) {
DEV assert( m != rs->_self );
if( m->state().primary() && m->hbinfo().up() ) {
if( p ) {
two = true;
return 0;
}
p = m;
}
m = m->next();
}
if( p )
noteARemoteIsPrimary(p);
return p;
}
Manager::Manager(ReplSetImpl *_rs) :
task::Server("rs Manager"), rs(_rs), busyWithElectSelf(false), _primary(NOPRIMARY) {
}
Manager::~Manager() {
/* we don't destroy the replset object we sit in; however, the destructor could have thrown on init.
the log message below is just a reminder to come back one day and review this code more, and to
make it cleaner.
*/
log() << "info: ~Manager called" << rsLog;
rs->mgr = 0;
}
void Manager::starting() {
Client::initThread("rs Manager");
}
void Manager::noteARemoteIsPrimary(const Member *m) {
if( rs->box.getPrimary() == m )
return;
rs->_self->lhb() = "";
if( rs->iAmArbiterOnly() ) {
rs->box.set(MemberState::RS_ARBITER, m);
}
else {
rs->box.noteRemoteIsPrimary(m);
}
}
/** called as the health threads get new results */
void Manager::msgCheckNewState() {
{
theReplSet->assertValid();
rs->assertValid();
RSBase::lock lk(rs);
if( busyWithElectSelf ) return;
const Member *p = rs->box.getPrimary();
if( p && p != rs->_self ) {
if( !p->hbinfo().up() ||
!p->hbinfo().hbstate.primary() ) {
p = 0;
rs->box.setOtherPrimary(0);
}
}
const Member *p2;
{
bool two;
p2 = findOtherPrimary(two);
if( two ) {
/* two other nodes think they are primary (asynchronously polled) -- wait for things to settle down. */
log() << "replSet info two primaries (transiently)" << rsLog;
return;
}
}
if( p2 ) {
/* someone else thinks they are primary. */
if( p == p2 ) {
// we thought the same; all set.
return;
}
if( p == 0 ) {
noteARemoteIsPrimary(p2);
return;
}
// todo xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
if( p != rs->_self ) {
// switch primary from oldremotep->newremotep2
noteARemoteIsPrimary(p2);
return;
}
/* we thought we were primary, yet now someone else thinks they are. */
if( !rs->elect.aMajoritySeemsToBeUp() ) {
/* we can't see a majority. so the other node is probably the right choice. */
noteARemoteIsPrimary(p2);
return;
}
/* ignore for now, keep thinking we are master.
this could just be timing (we poll every couple seconds) or could indicate
a problem? if it happens consistently for a duration of time we should
alert the sysadmin.
*/
return;
}
/* didn't find anyone who wants to be primary */
if( p ) {
/* we are already primary */
if( p != rs->_self ) {
rs->sethbmsg("error p != rs->self in checkNewState");
log() << "replSet " << p->fullName() << rsLog;
log() << "replSet " << rs->_self->fullName() << rsLog;
return;
}
if( rs->elect.shouldRelinquish() ) {
log() << "replSet can't see a majority of the set, relinquishing primary" << rsLog;
rs->relinquish();
}
return;
}
if( !rs->iAmPotentiallyHot() ) // if not we never try to be primary
return;
/* TODO : CHECK PRIORITY HERE. can't be elected if priority zero. */
/* no one seems to be primary. shall we try to elect ourself? */
if( !rs->elect.aMajoritySeemsToBeUp() ) {
static time_t last;
static int n;
int ll = 0;
if( ++n > 5 ) ll++;
if( last + 60 > time(0 ) ) ll++;
log(ll) << "replSet can't see a majority, will not try to elect self" << rsLog;
last = time(0);
return;
}
busyWithElectSelf = true; // don't try to do further elections & such while we are already working on one.
}
try {
rs->elect.electSelf();
}
catch(RetryAfterSleepException&) {
/* we want to process new inbounds before trying this again. so we just put a checkNewstate in the queue for eval later. */
requeue();
}
catch(...) {
log() << "replSet error unexpected assertion in rs manager" << rsLog;
}
busyWithElectSelf = false;
}
}
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