Stand-alone installation on linux hadoop Rom 50030 page faultsoccur , seeking god

mapred-site configuration file is:


mapred.job.tracker
localhost: 9001


View 50030
with a web page link Denied error occurs when
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the firewall off.
the / etc / hosts file all commented , leaving only a
localhost 127.0.0.1
Try
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50070 pages can open and view information
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solved, but they run a start-mapred.sh