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
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 hod 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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