Daily Archives: June 19, 2015

100 Hadoop Certification Dump Questions 9

Hadoop Certification Dump Questions 1. From given below which describes how a client reads a file from HDFS?  ( 1 ) The client queries all DataNodes in parallel. The DataNode that contains the requested data responds directly to the client. The client reads the data directly from the DataNode. The client contacts the NameNode for the block location(s). The NameNode then queries the DataNodes for block locations. The DataNodes respond […]