[jira] [Assigned] (TRAFODION-723) LP Bug: 1386860 - Avoid infinite loops during startup

["Suresh Subbiah (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TRAFODION-723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Suresh Subbiah reassigned TRAFODION-723:
----------------------------------------

    Assignee: Qifan Chen

> LP Bug: 1386860 - Avoid infinite loops during startup
> -----------------------------------------------------
>
>                 Key: TRAFODION-723
>                 URL: https://issues.apache.org/jira/browse/TRAFODION-723
>             Project: Apache Trafodion
>          Issue Type: Bug
>          Components: sql-cmp
>            Reporter: Roberta Marton
>            Assignee: Qifan Chen
>            Priority: Minor
>
> Several times in the last month, changes were made by several people that caused a compilation request during a critical operation which had a domino affect and ended up in an infinite loop.
> Examples
> During the startup protocol of the compiler process the parent sent the session user ID to the compiler process.  The compiler process received the user ID and tried to do a metadata read  through a CLI request to get the associated username.  The metadata lookup code needs to start another arkcmp process to compiler the request.  The second compiler would then start up a third compiler process to compile the metadata request.  Eventually, someone would fail.
>    
> In another situation, instead of starting up compiler processes, the code was starting up new embedded compiler contexts.  In this case, again during start up processing, a CLI request was issued to get metadata information.  This CLI request started another compiler context to compile the request, etc.
> There should be a way to detect that there is some kind of infinite loop going on and stop it before it gets out of control. 
> Creating the LP bug to track this change.



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