I am scheduling an Oozie MapReduce job to run every 15 minutes. I wonder what would happen if each job will take longer than that set time? Will it result in a job backlog? Or Oozie will create a new task / thread / fork for the new job while the previous one is still running?
Oozie won't run the next job before the previous one is over. If the first job takes more than 15 minutes to execute then the next one will be run after scheduled time. So scheduled time and running time may be different in Oozie.
EDIT:
Anyway, the described behaviour is default only and can be changed. You can set concurrency property from controls block to more than 1, and the next job will be run even the first one is still running. Check my answer on similar question
Related
i have an autosys box which runs at 7AM and 8AM daily. I understand that if 7AM execution does not finish till 8AM, My box will not be triggered at 8AM again.
I need to send an email from autosys to business stating that previous job is already running that is why next execution is not happening at 8AM. How can i do that? Please try to give the JIL file for it.
Thanks in advance
It all depends how have you licensed Autosys CA schedulers for your project. In our firm, we have configuration setup wherein if an Autosys job fails/terminates/maxruns/etc., it creates high severity incident.
Coming to your query, there's no straight forward way that i am aware of. First, normally we do not schedule same job in frequent intervals, unless it is a reporting job.
Still, if you want the job to generate some sort of alert if first execution exceeds start time of second execution, then you can add max_run_alarm or term_run_time in your JIL as per requirement and set it for 60 min since that's the interval between two executions.
Here is what i have added my script JIL for a data loader job :
max_run_alarm: 150
alarm_if_fail: y
alarm_if_terminated: y
box_terminator: y
term_run_time: 780
Which parameter you want to use will depend on your requirement. If you want to kill the first job then use term_run_time parameter so that second execution "might" start or use max_run_alarm parameter if you just want to send a MAX ALARM notification.
I use both! Hope this was useful.
In the ETL there are 2 parallel jobs and those 2 jobs run start and finish almost at the same time. After they are finished they will update few details to a same look up table. Both the parallel jobs are taking the same amount of time to finish. If both the jobs are started at the same time then the jobs are creating a mlock on the look up table and both the jobs are failing. Tried releasing mlock and running them again. But that is still going into mlock again. So added a wait time of 20 secs before the 1st parallel job. Then both the parallel jobs finished with any issue and updated the required details to the look up table.
Adding a wait time is not an ideal solution in this use case, because later on few parallel jobs needs to added (somewhere around 20-30). If wait steps were to be added before each parallel job, then the time increases drastically. Because for the 2nd job 20 sec, 3rd job 40 sec, so on.. This will be a large number by the time 20th job is reached.
So looking for an alternative solution rather than adding a wait step before each job to avoid the MLock issue?
Be sure each job has its own distinct log, work, and error table names. If multiple jobs that potentially try to run in parallel use the same names (e.g. the default generated names), you are more likely to run into issues.
But if the update is only for a "few details" then MLOAD is the wrong tool.
I am trying to understand autosys job. Suppose I have Job A that runs every 15 minutes. Suppose for some reason if Job A takes more than 15 minutes, will another instance of it run or it will wait for the job to finish before running another instance?
In my experience, if the previous job run is still running, another instance will not run if the next scheduled time comes. The next time the job runs is when the previous run is finished and the next scheduled time comes.
Another user also experienced this according to this answer.
I did not find any AutoSys documentation that officially confirms what happens in this situation, but I guess the best way to find out is to test it on your AutoSys instance.
I have experienced this first hand and can confirm that there won't be two instances in the mentioned scenario. The job will wait on the previous run to complete and will immediately kick off the next instance if the time condition is met before the previous completes.
But this will be the case only when the job is in running state, if the job is in any other state it will kick off based on the given start_time condition.
An oozie coordinator we own has been killed for operational reasons about a week ago. The cluster is now back up and running and ready for business. Can we revive it somehow so it will keep its run history and backfill all missing runs, or do we have to schedule a brand new one?
oozie job -resume xxxxxxx-xxxxxxxxxxxxxxx-oozie-oozi-C doesn't error out, but it also doesn't change the status of the coordinator back to RUNNING.
Have you tried out the killed -> ignored -> running transition? Based on the docs it should be possible.
It's a two step process: first one is based -ignore, second one is -change.
I've never tried to do this though :)
My requirement is to create a job in informatica which will run for every 15 min and look for a status column in abc table.If it is “Approved” THEN It will exit and kick off the rest of the jobs.
If the status is not approved it will not do anything and run after 15 min.This process wil continue until we have a approval status.
So, No matter what happens in the above two scenarios,This process will run in every 15 minutes.
I have worked on the same requirement in unix using loops and conditional statments but I am not sure how this can be achieved using informatica.Could you please help me on this.
Regards,
Karthik
I would try adding a scheduler that runs every 15 minutes. The best way that I've found to "loop" sessions in Informatica is:
run the session once, check if it failed using conditional links
if it did fail, run a timer task for an amount of time (a minute, an hour, whatever)
then try to run the same session again by copying and pasting the session up ahead of the timer task, and repeat a few times as necessary.
So if you added a scheduler into the mix, you could set the scheduler to have the workflow run every 15 minutes, and have the timer tasks halt the workflow for 4 or 5 minutes each. Then you could use SESSSTARTTIME function in some pre/post-session task to determine when the scheduler will fire off again and simply abort the workflow before that time.