Пример #1
0
/* 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;
}
Пример #2
0
    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 ) ) );
    }