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

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.

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

Relevant content