We have Jenkins set up in our intranet to poll a Bitbucket Git repository every minute. Last night our network went down so that the Git polling managed to see a change in Git, but when the job started Bitbucket was unavailable and fetching the repository failed.

After this every minute even though the Git polling failed, it launched the job (which consequently failed as well). During the night it caused 1000 failed builds. If the Git polling cannot connect to the Git repository, it should not start the job.

Polling log from a failed build (not the first one):

Started on Aug 5, 2013 6:14:55 PM
Using strategy: Default
[poll] Last Built Revision: Revision [removed] (origin/feature/[removed])
Fetching changes from the remote Git repositories
Fetching upstream changes from origin
ERROR: Problem fetching from origin / origin - could be unavailable. Continuing anyway
hudson.plugins.git.GitException: Command "git fetch -t origin +refs/heads/:refs/remotes/origin/" returned status code 128:
stdout:
stderr: ssh: Could not resolve hostname bitbucket.org: Temporary failure in name resolution
fatal: The remote end hung up unexpectedly

at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:774)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommand(CliGitAPIImpl.java:740)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.fetch(CliGitAPIImpl.java:161)
at hudson.plugins.git.GitAPI.fetch(GitAPI.java:230)
at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:793)
at hudson.plugins.git.GitSCM.access$000(GitSCM.java:57)
at hudson.plugins.git.GitSCM$1.invoke(GitSCM.java:723)
at hudson.plugins.git.GitSCM$1.invoke(GitSCM.java:706)
at hudson.FilePath$FileCallableWrapper.call(FilePath.java:2387)
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:1146)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:679)
Polling for changes in
Done. Took 5.1 sec
Changes found