Thanks, this is what I thought. Regards. 2009/4/10 Alex Loddengaard <a...@cloudera.com>
> Data is streamed directly from the data nodes themselves. The name node is > only queried for block locations and other meta data. > > Alex > > On Fri, Apr 10, 2009 at 8:33 AM, Stas Oskin <stas.os...@gmail.com> wrote: > > > Hi. > > > > I wanted to verify a point about HDFS client operations: > > > > When asking for file, is the all communication done through the NameNode? > > Or > > after being pointed to correct DataNode, does the HDFS works directly > > against it? > > > > Also, NameNode provides a URL named "streamFile" which allows any HTTP > > client to get the stored files. Any idea how it's operations compare in > > terms of speed to client HDFS access? > > > > Regards. > > >
