Default value for has been changed from true
to false. Secured clusters should make sure to explicitly set it to true in
XML configuration file before upgrading to one of these versions. (

True as default value of doesn't make any
sense, since not all clusters need authorization. (History: HBASE-13275
<>) Rather, only the
clusters which need authorization should set this config as false. Going
further, setting this config should be single switch to enable/disable
authorization, conditional on appropriate coprocessors loaded (a condition
we'll try to remove in future by incorporating access control directly into
hbase as core feature rather then as coprocessor).

-- Appy

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