[fedora-java] Hadoop + log4j2 = fullstop

[puntogil at libero.it]

Il 21/05/2014 18:03, Robert Rati ha scritto:
> I've been working on updating the hadoop package to the latest 2.4.0 
> release and at this point I've resolved all the issues but I'm now 
> blocked by the log4j2 update.  log4j2 breaks the hadoop build pretty 
> severely, and it doesn't seem the log4j2 team has spent much time 
> thinking about how to provide backwards compatibility to existing 
> log4j1.2 users.  From my investigation of log4j2:
>
> log4j.properties file is no longer read at all
> configuration file is now in XML or JSON
> configuration file name is log4j2.[xml|json|jsn]
> V2 isn't backwards compatible with V1.  There's a shim for v1 api but 
> it will only work for a limited set of cases, and for some cases it 
> does work for it turns some operations into noop calls.
>
> This is a pretty major change and even the compatibility layer, if it 
> will work for a project, does not seem to guarantee like functionality 
> and minimally will require a re-do of all log4j configuration files a 
> project ships.  I'm not sure many sizable upstream projects would 
> undertake/accept such a drastic change very quickly.
>
> The list of projects currently blocked by this update are:
> hadoop
> hbase
> oozie
> hive
> apache-log4j-extras
> amplab-tachyon
>
> I would be surprised if there aren't a lot more.  I understand Fedora 
> is always pushing for the latest versions, but for some fundamental 
> packages can there be compatibility packages introduced at the same 
> time as an incompatible update?  Package maintainers of dependent 
> packages will still need to touch their packages and determine if the 
> new version will work for them. Providing a compat package will also 
> allow packages to update to their newer versions while not held up on 
> trying to integrate changes from a compatibility breaking dependency 
> update.
>
> Rob
> -- 
> java-devel mailing list
> java-devel at lists.fedoraproject.org
> https://admin.fedoraproject.org/mailman/listinfo/java-devel
hi
other packages with the same problem:

hazelcast
jamonapi
metrics
snmp4j
solr
uimaj

propose:
remove compatibility link and alias fron log4j (2.x)
and create log4j1 package

regards
gil
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