Cron scheduler synchronized is not working as expected.

[Creative Cubs]

I want to run a cron for every 2 minutes interval, 0,2,4,6,8 .... each cron execution runs for 2 minutes. 

I configured cron schedule with synchronized as below. But I still see scheduler is behaving as if synchronized not given. 

Crons are scheduled at 

0-2 First cron

4-6 Second cron

8-10 third cron

Cron scheduler is waiting for 2 minutes after last cron execution. 

If I understand synchronized correctly, it is added to avoid this behavior. 

Please help why this happening. 

  <cron>

    <url>/cron/syncPrices</url>

    <description>Fetch data from source and cache it in data store.</description>

    <schedule>every 2 minutes synchronized</schedule>

  </cron>

[Ryan (Cloud Platform Support)]

If the cron job runs longer than the interval it will reset the clock. If you really need the every 2 minutes and your code is running longer than 2 minutes try running 2 crons at 4 minutes staggered 2 minutes apart.