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From "Varun Kapoor (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMBARI-194) Avoid TxnProgressWidget Getting Stuck In An Infinite Loop
Date Tue, 08 May 2012 23:29:49 GMT
Varun Kapoor created AMBARI-194:
-----------------------------------

             Summary: Avoid TxnProgressWidget Getting Stuck In An Infinite Loop
                 Key: AMBARI-194
                 URL: https://issues.apache.org/jira/browse/AMBARI-194
             Project: Ambari
          Issue Type: Bug
    Affects Versions: ambari-186
            Reporter: Varun Kapoor
            Priority: Critical
             Fix For: ambari-186


php/frontend/fetchTxnProgress.php's response JSON checks that at least one subTxn is in progress,
or it sets the top-level 'progress' key to null. The JS checks for this null-ness before deciding
to swap the loading image for the list of progress states. 

Sadly, when the backend txn is a no-op (for instance, when a service is already started but
a user starts it again from the Manage Services page), none of the subTxns will be in-progress,
causing this condition to be triggered. Thus, no-ops lead to the loading image showing forever,
with no way for users to break the cycle, which is pretty darn bad.

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