Taking issue. Should be fixed in 1.324 - I added a call to MailSender
(conditional on MavenMailer being configured for the project) in the cleanUp
method at the top-level MavenModuleSetBuild.RunnerImpl, so that we actually get
an email for the entire Maven project, not just one per module. That said,
email-ext does the trick on this too.

Code changed in hudson
User: : abayer
Path:
trunk/hudson/main/maven-plugin/src/main/java/hudson/maven/MavenModuleSetBuild.java
http://fisheye4.cenqua.com/changelog/hudson/?cs=21509
Log:
[FIXED JENKINS-1066] Added call to MailSender in RunnerImpl.cleanUp so that mail gets sent for top-level Maven project as well as individual modules. Also, William the Conqueror won the Battle of Hastings in 1066. Just thought I'd mention that.

• • • Issue 3955 has been marked as a duplicate of this issue. ***

Can this fix please be optional?
we use subversion and now for some reason when a poll is done and even when nothing in subversion has changed a email is trigger if the subversion server cannot be reached.

from time to time due to network issues. planned and unplanned maintance on the network and or dns server, subversion will not be reachable (mainly on weekends)
if the svn server cannot be reached we do not want a email triggered.
over the weekend this caused over 5000 emails over 1.5 days sent to developers who now thing hudson is a buggy system.

error:

Started by an SCM change
Building remotely on RHEL5.2_x86_64VM1
Updating http://subversion/dev/project/trunk
ERROR: Failed to update http://subversion/dev/project/trunk
org.tmatesoft.svn.core.SVNException: svn: unknown host
svn: OPTIONS request failed on '/dev/project/trunk'
at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:103)
at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:87)
at org.tmatesoft.svn.core.internal.io.dav.http.HTTPConnection.request(HTTPConnection.java:616)
at org.tmatesoft.svn.core.internal.io.dav.http.HTTPConnection.request(HTTPConnection.java:273)
at org.tmatesoft.svn.core.internal.io.dav.http.HTTPConnection.request(HTTPConnection.java:261)
at org.tmatesoft.svn.core.internal.io.dav.DAVConnection.exchangeCapabilities(DAVConnection.java:516)
at org.tmatesoft.svn.core.internal.io.dav.DAVConnection.open(DAVConnection.java:98)
at org.tmatesoft.svn.core.internal.io.dav.DAVRepository.openConnection(DAVRepository.java:1001)
at org.tmatesoft.svn.core.internal.io.dav.DAVRepository.getRepositoryUUID(DAVRepository.java:146)
at org.tmatesoft.svn.core.wc.SVNBasicClient.createRepository(SVNBasicClient.java:342)
at org.tmatesoft.svn.core.wc.SVNBasicClient.createRepository(SVNBasicClient.java:330)
at org.tmatesoft.svn.core.wc.SVNUpdateClient.update(SVNUpdateClient.java:535)
at org.tmatesoft.svn.core.wc.SVNUpdateClient.doUpdate(SVNUpdateClient.java:401)
at hudson.scm.SubversionSCM$CheckOutTask.invoke(SubversionSCM.java:699)
at hudson.scm.SubversionSCM$CheckOutTask.invoke(SubversionSCM.java:660)
at hudson.FilePath$FileCallableWrapper.call(FilePath.java:2018)
at hudson.remoting.UserRequest.perform(UserRequest.java:69)
at hudson.remoting.UserRequest.perform(UserRequest.java:23)
at hudson.remoting.Request$2.run(Request.java:213)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.net.UnknownHostException: svnglobal
at java.net.InetAddress.getAllByName0(InetAddress.java:1157)
at java.net.InetAddress.getAllByName(InetAddress.java:1083)
at java.net.InetAddress.getAllByName(InetAddress.java:1019)
at java.net.InetAddress.getByName(InetAddress.java:969)
at org.tmatesoft.svn.core.internal.util.SVNSocketFactory.createAddres(SVNSocketFactory.java:132)
at org.tmatesoft.svn.core.internal.util.SVNSocketFactory.createPlainSocket(SVNSocketFactory.java:54)
at org.tmatesoft.svn.core.internal.io.dav.http.HTTPConnection.connect(HTTPConnection.java:183)
at org.tmatesoft.svn.core.internal.io.dav.http.HTTPConnection.request(HTTPConnection.java:323)
... 22 more

rajpra what you seem to be referring to is more related to issue like JENKINS-10173 or JENKINS-763

PS: I think subversion checkout error should be handled as build errors!