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Item5776: MailerContrib cannot run multiple instances at the same time (document this fact)

Item Form Data

AppliesTo: Component: Priority: CurrentState: WaitingFor: TargetRelease ReleasedIn
Extension MailerContrib Normal Closed   patch 4.2.1

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Reported By:
Applies To:
Current State:
Waiting For:
Target Release:
Released In:


In the support TWiki for MailerContrib, I reported duplicate notifications from MailerContrib.

Turned out that the news and web notifies were running in parallel & interfering with each-other.

  • This indicates missing synchronization (semaphore/lock) in the code; it should not be the user's responsibility to manage synchronization.
  • Even if this is not fixed (and it should be), the restriction should be documented in the installation instructions.
  • I provided a work-around script that consolidates all twiki maintenance (news/web notify, statistics, ticktwiki) into a single script/crontab entry. You might want to include it as an example in the documentation; it would avoid having others run into this trap. And it is somewhat more efficient than having several cron jobs.

This was quite painful to live with -- I'm marking it normal rather than urgent because there is now a work-around.

-- TWiki:Main/TimotheLitt - 14 Jul 2008

Note script is in TWiki:Support/DuplicateNotificationsFromMailerCon

-- TWiki:Main.KennethLavrsen - 14 Jul 2008

A docu update should be sufficient to close this one.

A lock mechanism is a bit of an overkill and risky in case a lock file is left behind after a crash.

The docu I added to the MailerContrib.txt file points to the support topic so people can take advantage of the suggested script should they desire.

-- TWiki:Main.KennethLavrsen - 27 Jul 2008

Summary MailerContrib cannot run multiple instances at the same time (document this fact)
ReportedBy TWiki:Main.TimotheLitt
Codebase 4.1.2
SVN Range

AppliesTo Extension
Component MailerContrib
Priority Normal
CurrentState Closed

Checkins TWikirev:17144 TWikirev:17145
TargetRelease patch
ReleasedIn 4.2.1
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Topic revision: r6 - 2008-08-04 - KennethLavrsen
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