1. The _________ periodically receives a __________ and a blockreport from each ______ in the __________. A) Cluster, heartbeat, datanode, namenode B) Namenode, heartbeat, datanode, cluster C) Datanode, heartbeat, cluster, namenode D) Datanode, cluster, heartbeat, namenode 2. Which of the following conditions is suitable for HDFS? A) Large file size B) Write Many, Read Once C) Low-latency (short waiting time) data access D) All of the above 3. Which of the following about storing HDFS blocks is correct? A) Spread HDFS data uniformly across the datanodes in the cluster. B) Keep one of the replicas of a block on the same node as the node that is writing the block. C) Spread one replica of a block across another rack so that cluster can survive loss of whole rack. D) All of the above

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Windows

Windows is an operating system produced by Microsoft Corporation, initially released in the year 1985 and also known as Microsoft Windows. It has been written in JavaScript with visual basics, and C. Windows is the most popular operating system (OS) for personal computers across the globe. Since its inception, there has been a tough competition between Apple and Microsoft, yet one-third of the OS market share has been occupied by Windows. Although in recent years, Android has come up as another considerable competitor for these two organizations, which is leading the smartphone market, yet in desktops and laptops, Windows has the most number of customers.