Andrew, Thanks for starting this thread. I'll edit the wiki to provide more context around rolling-upgrades etc. which, as I pointed out in the original thread, are key IMHO.
On Jun 24, 2014, at 11:17 AM, Andrew Wang <andrew.w...@cloudera.com> wrote: > https://wiki.apache.org/hadoop/MovingToJdk7and8 > > I think based on our current compatibility guidelines, Proposal A is the > most attractive. We're pretty hamstrung by the requirement to keep the > classpath the same, which would be solved by either OSGI or shading our > deps (but that's a different discussion). I don't see that anywhere in our current compatibility guidelines. As you can see from http://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/Compatibility.html we do not have such a policy (pasted here for convenience): Java Classpath User applications built against Hadoop might add all Hadoop jars (including Hadoop's library dependencies) to the application's classpath. Adding new dependencies or updating the version of existing dependencies may interfere with those in applications' classpaths. Policy Currently, there is NO policy on when Hadoop's dependencies can change. Furthermore, we have *already* changed our classpath in hadoop-2.x. Again, as I pointed out in the previous thread, here is the precedent: On Jun 21, 2014, at 5:59 PM, Arun C Murthy <a...@hortonworks.com> wrote: > Also, this is something we already have done i.e. we updated some of our > software deps in hadoop-2.4 v/s hadoop-2.2 - clearly not something as > dramatic as JDK. Here are some examples: > https://issues.apache.org/jira/browse/HADOOP-9991 > https://issues.apache.org/jira/browse/HADOOP-10102 > https://issues.apache.org/jira/browse/HADOOP-10103 > https://issues.apache.org/jira/browse/HADOOP-10104 > https://issues.apache.org/jira/browse/HADOOP-10503 thanks, Arun -- CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.
