if (unknown.length == 0) {
log.info("nothing to process");
return false;
} else {
IntRange first = new IntRange(unknown[0]);
if (first.getLength() > BACKGROUND_READAHEAD) {
first.setTo(first.getFrom() + BACKGROUND_READAHEAD);
}
log.info("ensuring known " + first);
eventList.ensureKnown(first);