+1 for dropping Hadoop 2.2.0 binary and source-compatibility. The release is hardly used and complicates the important high-availability changes in Flink.
On Fri, Sep 4, 2015 at 9:33 AM, Stephan Ewen <se...@apache.org> wrote: > I am good with that as well. Mind that we are not only dropping a binary > distribution for Hadoop 2.2.0, but also the source compatibility with 2.2.0. > > > > Lets also reconfigure Travis to test > > - Hadoop1 > - Hadoop 2.3 > - Hadoop 2.4 > - Hadoop 2.6 > - Hadoop 2.7 > > > On Fri, Sep 4, 2015 at 6:19 AM, Chiwan Park <chiwanp...@apache.org> wrote: >> >> +1 for dropping Hadoop 2.2.0 >> >> Regards, >> Chiwan Park >> >> > On Sep 4, 2015, at 5:58 AM, Ufuk Celebi <u...@apache.org> wrote: >> > >> > +1 to what Robert said. >> > >> > On Thursday, September 3, 2015, Robert Metzger <rmetz...@apache.org> >> > wrote: >> > I think most cloud providers moved beyond Hadoop 2.2.0. >> > Google's Click-To-Deploy is on 2.4.1 >> > AWS EMR is on 2.6.0 >> > >> > The situation for the distributions seems to be the following: >> > MapR 4 uses Hadoop 2.4.0 (current is MapR 5) >> > CDH 5.0 uses 2.3.0 (the current CDH release is 5.4) >> > >> > HDP 2.0 (October 2013) is using 2.2.0 >> > HDP 2.1 (April 2014) uses 2.4.0 already >> > >> > So both vendors and cloud providers are multiple releases away from >> > Hadoop 2.2.0. >> > >> > Spark does not offer a binary distribution lower than 2.3.0. >> > >> > In addition to that, I don't think that the HDFS client in 2.2.0 is >> > really usable in production environments. Users were reporting >> > ArrayIndexOutOfBounds exceptions for some jobs, I also had these exceptions >> > sometimes. >> > >> > The easiest approach to resolve this issue would be (a) dropping the >> > support for Hadoop 2.2.0 >> > An alternative approach (b) would be: >> > - ship a binary version for Hadoop 2.3.0 >> > - make the source of Flink still compatible with 2.2.0, so that users >> > can compile a Hadoop 2.2.0 version if needed. >> > >> > I would vote for approach (a). >> > >> > >> > On Tue, Sep 1, 2015 at 5:01 PM, Till Rohrmann <trohrm...@apache.org> >> > wrote: >> > While working on high availability (HA) for Flink's YARN execution I >> > stumbled across some limitations with Hadoop 2.2.0. From version 2.2.0 to >> > 2.3.0, Hadoop introduced new functionality which is required for an >> > efficient HA implementation. Therefore, I was wondering whether there is >> > actually a need to support Hadoop 2.2.0. Is Hadoop 2.2.0 still actively >> > used >> > by someone? >> > >> > Cheers, >> > Till >> > >> >> >> >> >> >
