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This commit is contained in:
Dwight Merriman 2010-05-15 18:20:55 -04:00
parent ca9e079e22
commit 803c4e1514
3 changed files with 66 additions and 50 deletions
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23
db/repl/consensus.cpp
View File

@ -64,7 +64,7 @@ namespace mongo {
static const int VETO = -10000;
bool ReplSet::Consensus::electSelf() {
void ReplSet::Consensus::_electSelf() {
ReplSet::Member& me = *rs._self;
electCmd = BSON(
"replSetElect" << 1 <<
@ -96,11 +96,26 @@ namespace mongo {
if( time(0) - start > 30 ) {
// defensive; should never happen as we have timeouts on connection and operation for our conn
log() << "replSet too much time passed during election, ignoring result" << rsLog;
return false;
}
return true;
/* succeeded. */
rs._myState = PRIMARY;
log() << "replSet elected self as primary" << rsLog;
return;
}
return false;
}
void ReplSet::Consensus::electSelf() {
static mutex m;
{
scoped_lock lk(m);
if( inprog ) return;
inprog = true;
}
try { _electSelf(); } catch(...) { }
{
scoped_lock lk(m);
inprog = false;
}
}
}

80
db/repl/manager.cpp
View File

@ -53,51 +53,51 @@ namespace mongo {
/** called as the health threads get new results */
void ReplSet::Manager::checkNewState() {
static mutex m;
scoped_lock lk(m);
{
scoped_lock lk(m);
//log() << "replSet checkNewState " << rsLog;
const Member *p = _rs->currentPrimary();
const Member *p2 = findOtherPrimary();
try { p2 = findOtherPrimary(); }
catch(string s) {
log() << "replSet warning DIAG TODO " << s << rsLog;
return;
}
if( p == p2 && p ) return;
if( p2 ) {
/* someone else thinks they are primary. */
if( p == p2 )
const Member *p = _rs->currentPrimary();
const Member *p2 = findOtherPrimary();
try { p2 = findOtherPrimary(); }
catch(string s) {
/* two other nodes think they are primary (asynchronously polled) -- wait for things to settle down. */
log() << "replSet warning DIAG TODO " << s << rsLog;
return;
if( p == 0 )
noteARemoteIsPrimary(p2); return;
if( p != _rs->_self )
noteARemoteIsPrimary(p2); return;
/* we thought we were primary, yet now someone else thinks they are. */
if( !_rs->elect.aMajoritySeemsToBeUp() )
noteARemoteIsPrimary(p2); return;
/* ignore for now, keep thinking we are master */
return;
}
}
if( p ) {
/* we are already primary, and nothing significant out there has changed. */\
/* todo: if !aMajoritySeemsToBeUp, relinquish */
assert( p == _rs->_self );
return;
}
if( p == p2 && p ) return;
/* no one seems to be primary. shall we try to elect ourself? */
if( !_rs->elect.aMajoritySeemsToBeUp() ) {
_rs->_self->_lastHeartbeatErrMsg.set("can't see a majority, won't elect self");
return;
}
if( p2 ) {
/* someone else thinks they are primary. */
if( p == p2 ) // already match
return;
if( p == 0 )
noteARemoteIsPrimary(p2); return;
if( p != _rs->_self )
noteARemoteIsPrimary(p2); return;
/* we thought we were primary, yet now someone else thinks they are. */
if( !_rs->elect.aMajoritySeemsToBeUp() )
noteARemoteIsPrimary(p2); return;
/* ignore for now, keep thinking we are master */
return;
}
log() << "replSet todo elect self as primary primary" << rsLog;
_rs->_self->_lastHeartbeatErrMsg.set("todo code #2");
if( p ) {
/* we are already primary, and nothing significant out there has changed. */
/* todo: if !aMajoritySeemsToBeUp, relinquish */
assert( p == _rs->_self );
return;
}
/* no one seems to be primary. shall we try to elect ourself? */
if( !_rs->elect.aMajoritySeemsToBeUp() ) {
_rs->_self->_lastHeartbeatErrMsg.set("can't see a majority, won't elect self");
return;
}
_rs->_self->_lastHeartbeatErrMsg.set("");
}
_rs->elect.electSelf();
}
}

13
db/repl/replset.h
View File

@ -54,7 +54,6 @@ namespace mongo {
State _myState;
public:
void fatal();
bool isMaster(const char *client);
void fillIsMaster(BSONObjBuilder&);
@ -66,8 +65,7 @@ namespace mongo {
replsetname/host1,host2:port,...
where :port is optional.
throws exception if a problem initializing.
*/
throws exception if a problem initializing. */
ReplSet(string cfgString);
/* call after constructing to start - returns fairly quickly after launching its threads */
@ -90,12 +88,15 @@ namespace mongo {
void loadConfig();
void initFromConfig(ReplSetConfig& c);//, bool save);
struct Consensus {
class Consensus {
ReplSet &rs;
Consensus(ReplSet *t) : rs(*t) { }
bool inprog;
void _electSelf();
public:
Consensus(ReplSet *t) : rs(*t),inprog(false) { }
int totalVotes() const;
bool aMajoritySeemsToBeUp() const;
bool electSelf();
void electSelf();
} elect;
public: