1. All the specifics of Hadoop's operations are hidden in the source.
That's a get-out clause of OSS, I know, but sometimes it's the clearest.
2. For webhdfs I suspect it picks a local node with the data -you'd have
to experiment to make sure
3. If webhdfs is missing fetaures, I'm sure they'd be welcome
4. Hadoop 2.2+ uses protobuf for stable and cross platform IPC. , the
listLocatedStatus() call on a filesystem will give you all the locations of
blocks. Using that is another option -and probably higher performance- but
is going to require more upfront engineering than GET calls. Sticking to
WebHDFS -and extending it- is probably simpler
On 17 March 2014 17:29, RJ Nowling <[EMAIL PROTECTED]> wrote:
NOTICE: This message is intended for the use of the individual or entity to
which it is addressed and may contain information that is confidential,
privileged and exempt from disclosure under applicable law. If the reader
of this message is not the intended recipient, you are hereby notified that
any printing, copying, dissemination, distribution, disclosure or
forwarding of this communication is strictly prohibited. If you have
received this communication in error, please contact the sender immediately
and delete it from your system. Thank You.