in flink-connector-hbase-base/src/main/java/org/apache/flink/connector/hbase/sink/HBaseSinkFunction.java [288:294]
synchronized void mutate(Mutation current) {
ByteBuffer key = ByteBuffer.wrap(current.getRow());
Mutation old = mutations.get(key);
if (old == null || current.getTimeStamp() >= old.getTimeStamp()) {
mutations.put(key, current);
}
}