handle dead pools

synced-pool.go

@@ -465,7 +465,14 @@ func (p *SyncedPool) getGrainPool(id CartId) (GrainPool, error) {
 		p.mu.RLock()
 		remotePool, ok := p.remoteIndex[id]
 		p.mu.RUnlock()
-		if ok && remotePool != nil {
+		if ok {
+			if remotePool == nil {
+				p.mu.Lock()
+				delete(p.remoteIndex, id)
+				p.mu.Unlock()
+				return nil, fmt.Errorf("remote pool is nil", id)
+
+			}
 			remoteLookupCount.Inc()
 			return remotePool, nil
 		}