Build failed in Jenkins: Cassandra #1647

[Apache Jenkins Server <je...@builds.apache.org>]

See <https://builds.apache.org/job/Cassandra/1647/>

------------------------------------------
Started by an SCM change
Building remotely on ubuntu4 in workspace <https://builds.apache.org/job/Cassandra/ws/>
Checkout:Cassandra / <https://builds.apache.org/job/Cassandra/ws/> - hudson.remoting.Channel@539311ce:ubuntu4
Using strategy: Default
Last Built Revision: Revision 45ad66895d0e5b99feaa74ec061b887c1a9688a3 (origin/trunk)
Fetching changes from 1 remote Git repository
Fetching upstream changes from https://git-wip-us.apache.org/repos/asf/cassandra.git
Commencing build of Revision 45ad66895d0e5b99feaa74ec061b887c1a9688a3 (origin/trunk)
Checking out Revision 45ad66895d0e5b99feaa74ec061b887c1a9688a3 (origin/trunk)
FATAL: Could not apply tag jenkins-Cassandra-1647
hudson.plugins.git.GitException: Could not apply tag jenkins-Cassandra-1647
	at hudson.plugins.git.GitAPI.tag(GitAPI.java:751)
	at hudson.plugins.git.GitSCM$4.invoke(GitSCM.java:1321)
	at hudson.plugins.git.GitSCM$4.invoke(GitSCM.java:1269)
	at hudson.FilePath$FileCallableWrapper.call(FilePath.java:2196)
	at hudson.remoting.UserRequest.perform(UserRequest.java:118)
	at hudson.remoting.UserRequest.perform(UserRequest.java:48)
	at hudson.remoting.Request$2.run(Request.java:326)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:636)
Caused by: hudson.plugins.git.GitException: Command "git tag -a -f -m Jenkins Build #1647 jenkins-Cassandra-1647" returned status code 128:
stdout: 
stderr: 
*** Please tell me who you are.

Run

  git config --global user.email "you@example.com"
  git config --global user.name "Your Name"

to set your account's default identity.
Omit --global to set the identity only in this repository.

fatal: empty ident  <jenkins@janus.apache.org
> not allowed

	at hudson.plugins.git.GitAPI.launchCommandIn(GitAPI.java:818)
	at hudson.plugins.git.GitAPI.launchCommand(GitAPI.java:780)
	at hudson.plugins.git.GitAPI.launchCommand(GitAPI.java:790)
	at hudson.plugins.git.GitAPI.tag(GitAPI.java:749)
	... 12 more