Sumit Mohanty created AMBARI-15795:
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Summary: Parallel execution should only be allowed on commands
that have auto retry enabled
Key: AMBARI-15795
URL: https://issues.apache.org/jira/browse/AMBARI-15795
Project: Ambari
Issue Type: Bug
Components: ambari-agent
Affects Versions: 2.2.2
Reporter: Sumit Mohanty
Assignee: Sumit Mohanty
Fix For: 2.2.2
Parallel execution of commands can result in failures if the commands process
resources that are shared among the commands. For example, commands may check
and delete the same file resource. Deleting a file resource that is already
deleted is not a functional error but its does result in command failure.
Its not always possible to guarantee that stack scripts are written with guards
that can check the failure and then determine if its harmless or not. Auto
retry is a way to get around failures due to resource contention - think
eventual success. Try all commands in parallel - then try only the failed ones.
Each command is idempotent by definition so after a few retries all commands
succeed.
When commands without auto-retry option are executed in parallel then there is
no option to retry. This is not desirable.
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