我希望构建机器人在检测到新版本已提交给 svn 时触发构建器，但它失败了。只有添加了 Periodic 调度器才能触发构建器，但这不是我的期望。根据日志，
2012-07-30 23:51:33-0400 [-] SVNPoller: polling
2012-07-30 23:51:33-0400 [-] SVNPoller: _process_changes 11 .. 12
2012-07-30 23:51:33-0400 [-] Adding change revision 12
2012-07-30 23:51:34-0400 [-] SVNPoller: finished polling None
检测到新提交，但未触发构建器。
以下是我的配置文件：
c = BuildmasterConfig = {}
from buildbot.buildslave import BuildSlave
c['slaves'] = [BuildSlave("example-slave", "pass")]
c['slavePortnum'] = 9989
INTERVAL = 30
from buildbot.changes.svnpoller import SVNPoller, split_file_branches
svn_url = 'file:///data/subREPOS/project'
c['change_source'] = []
c['change_source'].append(SVNPoller(svnurl = svn_url,
split_file=split_file_branches, pollinterval=INTERVAL))
from buildbot.schedulers.basic import Scheduler
from buildbot.scheduler import Periodic
c['schedulers'] = []
c['schedulers'].append(Scheduler(name="General", branch=None,
treeStableTimer=3,
builderNames=["testbuilder"]))
c['schedulers'].append(Periodic("Periodic", ['testbuilder', ], INTERVAL))
from buildbot.process.factory import BuildFactory
from buildbot.steps.source import SVN
from buildbot.steps.shell import ShellCommand, Compile
factory = BuildFactory()
factory.addStep(ShellCommand(command=["ls"]))
factory.addStep(SVN(svn_url, None, 'incremental',workdir='sourcedir' ))
factory.addStep(Compile(workdir="sourcedir", command=["make"]))
from buildbot.config import BuilderConfig
c['builders'] = []
c['builders'].append(
BuilderConfig(name="testbuilder",
slavenames=["example-slave"],
factory=factory))