/* returns: # of seconds to sleep before next pass
0 = no sleep recommended
1 = special sentinel indicating adaptive sleep recommended
*/
int _replMain(OperationContext* txn, ReplSource::SourceVector& sources, int& nApplied) {
{
ReplInfo r("replMain load sources");
ScopedTransaction transaction(txn, MODE_X);
Lock::GlobalWrite lk(txn->lockState());
ReplSource::loadAll(txn, sources);
// only need this param for initial reset
_replMainStarted = true;
}
if (sources.empty()) {
/* replication is not configured yet (for --slave) in local.sources. Poll for config it
every 20 seconds.
*/
log() << "no source given, add a master to local.sources to start replication" << endl;
return 20;
}
int sleepAdvice = 1;
for (ReplSource::SourceVector::iterator i = sources.begin(); i != sources.end(); i++) {
ReplSource* s = i->get();
int res = -1;
try {
res = s->sync(txn, nApplied);
bool moreToSync = s->haveMoreDbsToSync();
if (res < 0) {
sleepAdvice = 3;
} else if (moreToSync) {
sleepAdvice = 0;
} else if (s->sleepAdvice()) {
sleepAdvice = s->sleepAdvice();
} else
sleepAdvice = res;
} catch (const SyncException&) {
log() << "caught SyncException" << endl;
return 10;
} catch (AssertionException& e) {
if (e.severe()) {
log() << "replMain AssertionException " << e.what() << endl;
return 60;
} else {
log() << "repl: AssertionException " << e.what() << endl;
}
replInfo = "replMain caught AssertionException";
} catch (const DBException& e) {
log() << "repl: DBException " << e.what() << endl;
replInfo = "replMain caught DBException";
} catch (const std::exception& e) {
log() << "repl: std::exception " << e.what() << endl;
replInfo = "replMain caught std::exception";
} catch (...) {
log() << "unexpected exception during replication. replication will halt" << endl;
replAllDead = "caught unexpected exception during replication";
}
if (res < 0)
s->oplogReader.resetConnection();
}
return sleepAdvice;
}
static void addSourceToList(ReplSource::SourceVector &v, ReplSource& s, ReplSource::SourceVector &old) {
if ( !s.syncedTo.isNull() ) { // Don't reuse old ReplSource if there was a forced resync.
for ( ReplSource::SourceVector::iterator i = old.begin(); i != old.end(); ) {
if ( s == **i ) {
v.push_back(*i);
old.erase(i);
return;
}
i++;
}
}
v.push_back( shared_ptr< ReplSource >( new ReplSource( s ) ) );
}