EMR : cron: A yarn command is skipped

Question

On EMR trying to add yarn command to cron.

I tested directly calling yarn command in cron. But it seems to be skipping that command.

This is the command added to cron

*/1 * * * *  hadoop date;yarn

No matter where I put even script skips it. If I execute a script manually it works. Just via cron yarn is not even attempted

rePost-User-2319878 · Accepted Answer

Thanks for you response. 
Yes the intention is to run multiple commands. It does not need to be in inside ( ). I have verified this.  It inly needs to be separated out with semi-colon.
And I was able to find the problem. The command was failing with some environment variable settings and it is good now. It wasn't a issue with yarn command or cron.
Thanks again for responding.

Krishnadas M · Answer

The command mentioned above `hadoop date;yarn` looks incomplete. Can you please  share an example of what you are trying to do?

If the intention is to run multiple commands in a cron you can surround the semicolon separate commands inside a `(` `)`, for example `*/1 * * * * (hadoop version;yarn version)`. I hope this answers your question, if not please share more details on the use case and I'll be happy to assist you.

EMR : cron: A yarn command is skipped

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