Apache Hadoop YARN
Apache Hadoop YARN (Yet Another Ressources Negotiator) is a distributed technology launched in 2012 with the release of Hadoop 2. It overcomes the weaknesses of MapReduce. YARN can run any type of distributed process unlike Hadoop 1, which only allowed MapReduce.
YARN is used to split resource management and job scheduling on different daemons within the cluster. It therefore acts as ressource manager and job scheduler.
Note that there is a namesake project in the Node.js ecosystem. It is a JavaScript package manager and it shares no relationship with the one hosted by the Apache Foundation and the Hadoop project.
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