brew install hbase tries to install hadoop though already present

Hadoop is already present (and has been working fine for better part of a year)

07:48:30/~:177 $which hadoop

But attempting to install hbase results in a hadoop dependency error:

07:48:28/~:176 $brew install hbase
==> Installing hbase dependency: hadoop
Warning: Could not link hadoop. Unlinking...
Error: Permission denied - /usr/local/bin/task-controller


Try the following

    $ brew upgrade hadoop
    $ brew install hbase

After I uninstalled hbase this particular error did not recur: instead the following happened:

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