The DN does not need to authenticate as the "root" HDFS user to perform
administrative tasks.
A while back, we started an initiative to reduce the exposure of the HDFS
"root" user due to security concerns. In doing so, we tightened up where we
distribute the HDFS keytab file. However since then some services need to
create directories and change permissions on them as the HDFS root user upon
installation; and thus, the keytab file is being distributed more than some
security-conscious people would like. Until we find a way to centralize the
creation of these HDFS resources, we need to deal with this.
You should not normally need the HDFS keytab file on DN hosts... are you having
an issue?
Rob
On 4/4/18, 2:15 PM, "Di Li" <osji...@gmail.com> wrote:
Hi folks,
I noticed hdfs.headless.keytab only exists on NameNode and HDFS client
node.
Could someone please share some details on why DN does not need the
hdfs.headless.keytab ? I thought we need it in order for DN to work against
NN.
Any negative impacts if I always include hdfs.headless.keytab on the DN
nodes (such as ensure HDFS client always cohost with DNs) ?
Thank you.
Di
