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The "FAQ" page has been changed by SomeOtherAccount: http://wiki.apache.org/hadoop/FAQ?action=diff&rev1=102&rev2=103 Comment: Remove the gridgain question and clarify that the platforms question also covers java. == What is Hadoop? == [[http://hadoop.apache.org/core/|Hadoop]] is a distributed computing platform written in Java. It incorporates features similar to those of the [[http://en.wikipedia.org/wiki/Google_File_System|Google File System]] and of [[http://en.wikipedia.org/wiki/MapReduce|MapReduce]]. For some details, see HadoopMapReduce. - == What platform does Hadoop run on? == + == What platform and Java versions does Hadoop run on? == 1. Java 1.6.x or higher, preferably from Sun -see HadoopJavaVersions 1. Linux and Windows are the supported operating systems, but BSD, Mac OS/X, and OpenSolaris are known to work. (Windows requires the installation of [[http://www.cygwin.com/|Cygwin]]). @@ -35, +35 @@ == What kind of hardware scales best for Hadoop? == The short answer is dual processor/dual core machines with 4-8GB of RAM using ECC memory. Machines should be moderately high-end commodity machines to be most cost-effective and typically cost 1/2 - 2/3 the cost of normal production application servers but are not desktop-class machines. This cost tends to be $2-5K. For a more detailed discussion, see MachineScaling page. - == How does GridGain compare to Hadoop? == - !GridGain does not support data intensive jobs. For more details, see HadoopVsGridGain. - == I have a new node I want to add to a running Hadoop cluster; how do I start services on just one node? == This also applies to the case where a machine has crashed and rebooted, etc, and you need to get it to rejoin the cluster. You do not need to shutdown and/or restart the entire cluster in this case.
