Improve error when failing to determine master address

Description

When the master address cannot be determined, e.g. because Zookeeper is unavailable, we print a message along the lines of "Failed to connect to Master @ null". This could make users think that their configuration is wrong, when the root cause is actually a network issue. We should improve the error message to clarify that the root issue is a failure to determine the master address.

Environment

None

Status

Assignee

Andrew Audibert

Reporter

Andrew Audibert

Labels

None

Components

Affects versions

1.7.1

Priority

Minor
Configure