@Kyle Pifer please use our docs to install, wiki's tend to be a bit out of date http://docs.hortonworks.com/HDPDocuments/Ambari-2.2.0.0/bk_ambari_reference_guide/content/ch_amb_ref_configuring_ambari_metrics.html
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@Lubin Lemarchand you need to use the password you used when you installed the cluster. Otherwise read up how to reset your root password
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@Roberto Sancho you do not control number of splits API handles that. You're number of splits is determined by number of blocks in your dataset and size of block.
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@Tony Chen make sure your nonroot users have correct permissions. This bug is discussed in https://issues.apache.org/jira/plugins/servlet/mobile#issue/MAPREDUCE-3056
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