Build failed in Jenkins: kafka-trunk-git-pr #9

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See <https://builds.apache.org/job/kafka-trunk-git-pr/9/>

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GitHub pull request #42 to apache/kafka
Building remotely on ubuntu3 (Ubuntu ubuntu legacy-ubuntu) in workspace <https://builds.apache.org/job/kafka-trunk-git-pr/ws/>
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url git://github.com/apache/kafka.git # timeout=10
Fetching upstream changes from git://github.com/apache/kafka.git
 > git --version # timeout=10
 > git fetch --tags --progress git://github.com/apache/kafka.git +refs/heads/*:refs/remotes/origin/*
 > git config core.sparsecheckout # timeout=10
 > git checkout -f origin/0.8.1 # timeout=10
 > git branch -a # timeout=10
 > git rev-parse 0.8.1^{commit} # timeout=10
 > git rev-parse trunk^{commit} # timeout=10
 > git rev-parse remotes/origin/0.7^{commit} # timeout=10
 > git rev-parse remotes/origin/0.7.0^{commit} # timeout=10
 > git rev-parse remotes/origin/0.7.1^{commit} # timeout=10
 > git rev-parse remotes/origin/0.7.2^{commit} # timeout=10
 > git rev-parse remotes/origin/0.8^{commit} # timeout=10
 > git rev-parse remotes/origin/0.8.0-beta1-candidate1^{commit} # timeout=10
 > git rev-parse remotes/origin/0.8.1^{commit} # timeout=10
 > git rev-parse remotes/origin/0.8.2^{commit} # timeout=10
 > git rev-parse remotes/origin/consumer_redesign^{commit} # timeout=10
 > git rev-parse remotes/origin/legacy_client_libraries^{commit} # timeout=10
 > git rev-parse remotes/origin/transactional_messaging^{commit} # timeout=10
 > git rev-parse remotes/origin/trunk^{commit} # timeout=10
 > git branch -D 0.8.1 # timeout=10
 > git checkout -b 0.8.1 origin/0.8.1
FATAL: Could not checkout 0.8.1 with start point origin/0.8.1
hudson.plugins.git.GitException: Could not checkout 0.8.1 with start point origin/0.8.1
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$8.execute(CliGitAPIImpl.java:1619)
	at org.jenkinsci.plugins.gitclient.AbstractGitAPIImpl.checkoutBranch(AbstractGitAPIImpl.java:72)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.checkoutBranch(CliGitAPIImpl.java:85)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at hudson.remoting.RemoteInvocationHandler$RPCRequest.perform(RemoteInvocationHandler.java:310)
	at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:290)
	at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:249)
	at hudson.remoting.UserRequest.perform(UserRequest.java:118)
	at hudson.remoting.UserRequest.perform(UserRequest.java:48)
	at hudson.remoting.Request$2.run(Request.java:328)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
Caused by: hudson.plugins.git.GitException: Command "git checkout -b 0.8.1 origin/0.8.1" returned status code 1:
stdout: core/src/test/scala/unit/kafka/server/DynamicConfigChangeTest.scala: needs merge
core/src/test/scala/unit/kafka/server/ReplicaManagerTest.scala: needs merge
scala.gradle: needs merge

stderr: error: you need to resolve your current index first

	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1435)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$500(CliGitAPIImpl.java:85)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$8.execute(CliGitAPIImpl.java:1614)
	... 17 more