public long realtimeIngest(List<String> dims,
                               List<Metric> metrics,
                               Map<String, String> nameToAlias,
                               TagSetting tagSetting,
                               EventIgnoreStrategy ignoreStrategy,
                               boolean grouping,
                               Fetcher fetcher,
                               int maxRow,
                               long maxPeriod,
                               RTResources rtResources) throws Exception {
        Preconditions.checkState(state == State.Created);
        return ingestRows(
                dims,
                metrics,
                nameToAlias,
                grouping,
                tagSetting,
                ignoreStrategy,
                fetcher,
                maxRow,
                maxPeriod,
                true,
                rtResources);
    }
Rows in memory has dump to local disk.
indexr-segment/src/main/java/io/indexr/segment/rt/RealtimeSegment.java