Cannot enable collborative editing, probelm with synchrony

Question

Confluence stopped allowing us to edit pages today.  As far as I know nothing changed, (I did do some backing up and restoring of our JIRA DB.  I took a backup of the JIRA db and played around with a few restores then reverted to backup I took before I started.  So everything should be exactly as it was).

Anyway this morning Confluence was erroring when anyone tried to edit a page.  I trakced this down to collaborative editing and under General Configuration > Collaborative Editing it showed that collaborative editing was enabled, but synchrony was stopped with an error.  I switch editing mode to collaborative editing OFF and we can now edit pages.  When I try to renable it, it just hangs.  sometimes the page in the back ground briefly shows a message saying that synchrony is restarting, but that quickly disappears.

I've checked the logs but they mean very little to me.  I've included them here in case the make sense to someone else

attalssian-confluence.log
================

2018-03-19 10:57:27,558 INFO [Long running task: EnableTask] [plugins.synchrony.bootstrap.DefaultSynchronyProcessManager] startup Starting Synchrony and enabling Collaborative Editing
2018-03-19 10:57:27,667 ERROR [Long running task: EnableTask] [plugins.synchrony.tasks.AbstractConfigLongRunningTask] runInternal An error occurred when running a Synchrony ConfigLongRunningTask
 -- url: /rest/synchrony-interop/enable | referer: http://oxnetwebapp03:8090/admin/confluence-collaborative-editor-plugin/configure.action | traceId: 64098d55f98c05dc | userName: porrittg
org.zeroturnaround.exec.InvalidExitValueException: Unexpected exit value: 1, allowed exit values: [0], executed command [taskkill, /F, /PID, 4700]
 at org.zeroturnaround.exec.InvalidExitUtil.checkExit(InvalidExitUtil.java:27)
 at org.zeroturnaround.exec.WaitForProcess.call(WaitForProcess.java:114)
 at org.zeroturnaround.exec.ProcessExecutor.executeNoTimeout(ProcessExecutor.java:903)
 at org.zeroturnaround.process.WindowsProcess.taskkill(WindowsProcess.java:104)
 at org.zeroturnaround.process.WindowsProcess.destroy(WindowsProcess.java:93)
 at org.zeroturnaround.process.AbstractProcess.destroyForcefully(AbstractProcess.java:107)
 at org.zeroturnaround.process.AbstractProcess.destroyForcefully(AbstractProcess.java:16)
 at org.zeroturnaround.process.ProcessUtil.destroyForcefullyAndWait(ProcessUtil.java:108)
 at org.zeroturnaround.process.ProcessUtil.destroyGracefullyOrForcefullyAndWait(ProcessUtil.java:171)
 at com.atlassian.confluence.plugins.synchrony.utils.SynchronyProcessUtil.killRunningSynchronyProcess(SynchronyProcessUtil.java:51)
 at com.atlassian.confluence.plugins.synchrony.bootstrap.DefaultSynchronyProcessManager.startup(DefaultSynchronyProcessManager.java:521)
 at com.atlassian.confluence.plugins.synchrony.tasks.EnableTask.execute(EnableTask.java:47)
 at com.atlassian.confluence.plugins.synchrony.tasks.AbstractConfigLongRunningTask.runInternal(AbstractConfigLongRunningTask.java:65)
 at com.atlassian.confluence.util.longrunning.ConfluenceAbstractLongRunningTask.run(ConfluenceAbstractLongRunningTask.java:26)
 at com.atlassian.confluence.util.longrunning.ManagedTask.run(ManagedTask.java:52)
 at com.atlassian.confluence.impl.util.concurrent.ConfluenceExecutors$ThreadLocalContextTaskWrapper.lambda$wrap$1(ConfluenceExecutors.java:90)
 at com.atlassian.confluence.vcache.VCacheRequestContextOperations.lambda$doInRequestContext$0(VCacheRequestContextOperations.java:50)
 at com.atlassian.confluence.impl.vcache.VCacheRequestContextManager.doInRequestContextInternal(VCacheRequestContextManager.java:87)
 at com.atlassian.confluence.impl.vcache.VCacheRequestContextManager.doInRequestContext(VCacheRequestContextManager.java:71)
 at com.atlassian.confluence.vcache.VCacheRequestContextOperations.doInRequestContext(VCacheRequestContextOperations.java:49)
 at com.atlassian.confluence.vcache.VCacheRequestContextOperations.lambda$withRequestContext$2(VCacheRequestContextOperations.java:66)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at java.lang.Thread.run(Thread.java:748)

porrittg · Answer

Thanks for your reply.  I'm not sure if I did anything, but the collaborative editing page now shows that is enabled and the Synchrony service is running and I can edit.

I did locate the confluence-stop.bat file and ran it but it didn't stop confluence, so I restarted the window service and when I checked it was all as expected.

Not going to question it.

Thanks again

Guy

AnnWorley · Answer

Hello Guy,

From the error message:

http://oxnetwebapp03:8090/admin/confluence-collaborative-editor-plugin/configure.action | traceId: 64098d55f98c05dc | userName: porrittg
org.zeroturnaround.exec.InvalidExitValueException: Unexpected exit value: 1, allowed exit values: [0], executed command [taskkill, /F, /PID, 4700]

It looks like Confluence cannot kill the Synchrony process when you try to restart Synchrony.

Please check out the steps at: Multiple Synchrony processes:

Multiple Synchrony processes
If you see an error immediately in the editor, but Confluence reports that Synchrony is running, check to make sure that you only have one Synchrony process running.

If you do have multiple Synchrony processes running, stop Confluence, kill the additional Synchrony processes and then restart Confluence.

You can avoid this problem by always using stop-confluence.sh / stop-confluence.bat to stop Confluence, rather than simply closing the Tomcat window.

I look forward to hearing whether you can edit as expected after making sure Synchrony is not running 2 processes.

Thanks,

Ann