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WebHdfsSensor doesn't support HDFS HA

Hi all,

We've been using WebHdfsSensor happily to sensor the state of upstream
tasks outputting to HDFS except when there is a namenode switch. I've
opened https://issues.apache.org/jira/browse/AIRFLOW-2901 to discuss the
HDFS HA support.

There are two solutions that I can see,

1. use pyarrow.hdfs which has HA support
2. allow user to configure a list of namenodes


Manu Zhang