So, you want to compile hdfs/yarn/mapred clients (and hadoop-common and hadoop-auth) with JDK6 and the rest with JDK7?
On Fri, Apr 4, 2014 at 3:15 PM, Haohui Mai <h...@hortonworks.com> wrote: > I'm referring to the later case. Indeed migrating JDK7 for branch-2 is more > difficult. > > I think one reasonable approach is to put the hdfs / yarn clients into > separate jars. The client-side jars can only use JDK6 APIs, so that > downstream projects running on top of JDK6 continue to work. > > The HDFS/YARN/MR servers need to be run on top of JDK7, and we're free to > use JDK7 APIs inside them. Given the fact that there're way more code in > the server-side compared to the client-side, having the ability to use JDK7 > in the server-side only might still be a win. > > The downside I can think of is that it might complicate the effort of > publishing maven jars, but this should be an one-time issue. > > ~Haohui > > > On Fri, Apr 4, 2014 at 2:37 PM, Alejandro Abdelnur <t...@cloudera.com > >wrote: > > > Haohui, > > > > Is the idea to compile/test with JDK7 and recommend it for runtime and > stop > > there? Or to start using JDK7 API stuff as well? If the later is the > case, > > then backporting stuff to branch-2 may break and patches may have to be > > refactored for JDK6. Given that branch-2 got GA status not so long ago, I > > assume it will be active for a while. > > > > What are your thoughts on this regard? > > > > Thanks > > > > > > On Fri, Apr 4, 2014 at 2:29 PM, Haohui Mai <h...@hortonworks.com> wrote: > > > > > Hi, > > > > > > There have been multiple discussions on deprecating supports of JDK6 > and > > > moving towards JDK7. It looks to me that the consensus is that now > hadoop > > > is ready to drop the support of JDK6 and to move towards JDK7. Based on > > the > > > consensus, I wonder whether it is a good time to start the migration. > > > > > > Here are my understandings of the current status: > > > > > > 1. There is no more public updates of JDK6 since Feb 2013. Users no > > longer > > > get fixes of security vulnerabilities through official public updates. > > > 2. Hadoop core is stuck with out-of-date dependency unless moving > towards > > > JDK7. (see > > > http://hadoop.6.n7.nabble.com/very-old-dependencies-td71486.html) > > > The implementation can also benefit from it thanks to the new > > > functionalities in JDK7. > > > 3. The code is ready for JDK7. Cloudera and Hortonworks have successful > > > stories of supporting Hadoop on JDK7. > > > > > > > > > It seems that the real work of moving to JDK7 is minimal. We only need > to > > > (1) make sure the jenkins are running on top of JDK7, and (2) to update > > the > > > minimum required Java version from 6 to 7. Therefore I propose that > let's > > > move towards JDK7 in trunk in the short term. > > > > > > Your feedbacks are appreciated. > > > > > > Regards, > > > Haohui > > > > > > -- > > > 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. > > > > > > > > > > > -- > > Alejandro > > > > -- > 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. > -- Alejandro
