Fellow teachers, I am the etl engineer post, is actually do is traditional warehouse work, the islands of the traditional database data, do the integration, through the etl tool, the number of data is loaded into the warehouse, I walked several traditional warehouse have four to five years, now want to turn - big data, data warehouse, but not development, read online recruitment requires Java, good hard ah, I would rather learn Hadoop,, looking at to Java technology, is about to give up (Java without a few years immersed, play fixed) ,,, consult everybody, if I learn alone Hadoop, need the etl work skills, does not involve Java development, this can, such as school hive hbase has a task scheduling azkaban, and so can work of large data warehouse, and there are some I see also design the etl work, like kafka spark but should have the ability of Java,, alas, too difficult, please clean