hbase - PredictionIO pio status: Zookeeper exists failed - Stack Overflow
It sounds like HBase hasn't been initialized properly. First try doing pio-stop-all and then pio-start-all, and then try pio status again. If that doesn't work, then go ahead and run pio-stop-all again, and then look for a running instance of HBase by typing in the following command ps aux | grep hbase, and shut down the appropriate instance of HBase that is running (use kill -9 <PID>). After typing in pio-start-all again, you should be able to run pio status without the fore mentioned error.
----EDIT-----
Since you just installed PredictionIO, running pio-start-all should suffice. However, in my experience, if you are using HBase you may run into a situation where you have to kill the process manually as stated above.
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