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From "Roman Shaposhnik (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BIGTOP-367) Upgrade sequencing issue
Date Fri, 27 Jan 2012 23:08:09 GMT

    [ https://issues.apache.org/jira/browse/BIGTOP-367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13195208#comment-13195208
] 

Roman Shaposhnik commented on BIGTOP-367:
-----------------------------------------

+1. This is one heck of a trick -- but I like the fact that it is so simple.
                
> Upgrade sequencing issue
> ------------------------
>
>                 Key: BIGTOP-367
>                 URL: https://issues.apache.org/jira/browse/BIGTOP-367
>             Project: Bigtop
>          Issue Type: Bug
>          Components: Debian, RPM
>    Affects Versions: 0.2.0, 0.3.0
>            Reporter: Bruno Mahé
>            Assignee: Bruno Mahé
>         Attachments: BIGTOP-367.patch
>
>
> There is an issue regarding the way services are condrestart after an upgrade.
> To illustrate this issue, here is an upgrade sequence extracted from a very verbose rpm
upgrade session of hadoop and hadoop-jobtacker:
> {noformat}
> %pre(hadoop-X)
> installation of hadoop-X files
> %post(hadoop-X)
> %pre(hadoop-jobtracker-X)
> install of hadoop-jobtracker-X files
> %post(hadoop-jobtracker-X)
> %preun(hadoop-jobtracker-X-1)
> removal of hadoop-jobtracker-X-1 files
> %postun(hadoop-jobtracker-X-1) => jobtracker service is restarted
> %preun(hadoop-X-1)
> removal of hadoop-X-1 files
> %postun(hadoop-X-1)
> {noformat}
> So when the jobtracker is condrestart, both jars of hadoop X and X-1 are presents. And
if the jars have different versions, because of the way hadoop script pick up jars, the older
version will be picked up first. There may also be other issues.
> But this defeat the purpose of doing a condrestart.
> I am not sure yet how to go about this issue, but here are some ideas:
> * We don't deal with it. Bigtop stable releases only deal with bugfixes and we don't
support upgrade between major Bigtop versions. Since there wouldn't be any bump in the jars'
versions, this issue would not happen
> * We stop doing condrestart on upgrade
> * We push back the init scripts in their main package. But then, doing a chkconfig on
install/upgrade may be a bad idea
> * Do an ugly hack by moving the %postun of the service packages directly to the main
package (with a if [ -x] around it for each service)
> All ideas are welcome!
> Note: I took hadoop as an example, but it can happen to any of our package which also
provide a service
> PS: This issue may need also to be confirmed on ubuntu/debian. I am not sure how the
upgrade process is sequenced

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