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06-01-2016
02:44 PM
The HDPCA certification and digital badge are tied to a version of HDP used when you took the exam. So if you recently passed it, that would be HDP 2.3. You will always hold this certification, but after a couple of years it will become out of date as the framework evolves.
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06-07-2016
05:42 PM
In the document "http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.3.2/bk_installing_manually_book/content/installing_flume.html", it states "Hortonworks recommends that administrators not install Flume agents on any node in a Hadoop cluster." That is a really subtle (and hard to notice!) way of saying to put Flume on dedicated servers. As noted above, in a smaller cluster you can get away with putting them on other nodes. A lot of this depends on the volume of data being processed by Flume and what else if running on the host. There is also some good info on flume resource at https://cwiki.apache.org/confluence/display/FLUME/Flume's+Memory+Consumption.
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