Database Reference
In-Depth Information
client's behalf using the usual
DistributedFileSystem
API. The two ways are il-
lustrated in
Figure 3-1
. Both use the WebHDFS protocol.
Figure 3-1. Accessing HDFS over HTTP directly and via a bank of HDFS proxies
In the first case, the embedded web servers in the namenode and datanodes act as We-
bHDFS endpoints. (WebHDFS is enabled by default, since
dfs.webhdfs.enabled
is
set to
true
.) File metadata operations are handled by the namenode, while file read (and
