IllegalStateException: Phoenix driver closed because server is shutting down

[Batyrshin Alexander]

Is there any reason for this exception? Which exactly server is shutting down 
if we use quorum of zookepers?

java.lang.IllegalStateException: Phoenix driver closed because server is 
shutting down
        at 
org.apache.phoenix.jdbc.PhoenixDriver.throwDriverClosedException(PhoenixDriver.java:290)
        at 
org.apache.phoenix.jdbc.PhoenixDriver.checkClosed(PhoenixDriver.java:285)
        at org.apache.phoenix.jdbc.PhoenixDriver.connect(PhoenixDriver.java:220)
        at java.sql.DriverManager.getConnection(DriverManager.java:664)
        at java.sql.DriverManager.getConnection(DriverManager.java:270)