Starting delegation token manager during safemode fails
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Key: HDFS-2579
URL: https://issues.apache.org/jira/browse/HDFS-2579
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node, security
Affects Versions: 0.23.0
Reporter: Todd Lipcon
I noticed this on the HA branch, but it seems to actually affect non-HA branch
0.23 if security is enabled. When the NN starts up, if security is enabled, we
start the delegation token secret manager, which then tries to call
{{logUpdateMasterKey}}. This fails because the edit logs may not be written
while in safe-mode.
It seems to me that there's not any necessary reason that you have to make a
new master key at startup, since you've loaded the old key when you load the
FSImage. You'd only be lacking a DT master key on a fresh cluster, in which
case we could have it generate one at format time.
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