while(System.currentTimeMillis() < timeStart + slopDrainTimoutMs) {
allSlopsEmpty = true;
for(Integer nodeId: vservers.keySet()) {
VoldemortServer vs = vservers.get(nodeId);
SlopStorageEngine sse = vs.getStoreRepository().getSlopStore();
ClosableIterator<ByteArray> keys = sse.keys();
long count = 0;
while(keys.hasNext()) {
keys.next();
count++;
}