To my understanding, the reader read file blocks in parallel. -----Original Message----- From: Hassen Riahi [mailto:hassen.ri...@cern.ch] Sent: 2011年5月7日 23:50 To: hdfs-user@hadoop.apache.org Subject: Read files from hdfs
Hi all, is the read operation of 1 file stored in hdfs done in parallel? I mean let's say that I have 1 file split in 2 blocks (hdfs block) and each block is stored in 1 rack. When reading this file, both blocks are read in parallel? or the first block is read and then once done the read of the second block begins? If the later is right, the read of files in hdfs is then sequential. is it right or am I missing something? Thanks, Hassen
