Hi thanks for your reply! it really help alot! thanks again .
2011/5/6 Matthew Foley <ma...@yahoo-inc.com> > Xu, the datanode only stores the amount of data provided. If the last > block only has, e.g., 10 bytes in it, then the datanode will use one > low-level block (the minimum space allocation from the underlying file > system) to store those 10 bytes. Typically, low-level blocks are 8KB, but > that depends on the server's OS and FS configuration -- it's not visible to > Hadoop. It definitely won't use up 64MB of datanode storage. > > --Matt > > > On May 5, 2011, at 12:49 AM, cheng xu wrote: > > Hi > all. > > as we know. the last block of file may be less then 64MB(as default > configged), then what will hdfs do with the remained space in the block?? > left for other files or just left unused?? > > any answer or related url is appreciated! > thanks > xu > >
