> Regarding the original question, I would be in favor of the proposal. Time > marches on. I assume just to state the obvious that our destination of > minimum LTS would shift from 8 to 11.
Yes, sorry I should have expressly stated JDK11 would become the minimum with some release after HBase 3. I got here because I wanted to start working on qualifying JDK17 as a runtime environment but then realized we were putting more caveats on JDK11 than I expected. Hadoop 2 isn’t exactly dead, at least the source branch is still receiving > occasional update, but is not releasing. We should probably consider it > effectively EOL. IIRC we've already dropped Hadoop 2 support for HBase 3. The Hadoop minimum could become 3.3. The primary consideration to my mind > is the state of S3A: in what version it can be said to be stable and > feature complete. I think 3.3 is the appropriate code line for that > criteria but perhaps 3.2 could serve as well. I really like this as a criteria. Anyone else have an idea on this? On Tue, Feb 15, 2022, 16:28 Andrew Purtell <andrew.purt...@gmail.com> wrote: > The section in our docs on JDK11 seems out of date. In my experience using > Java 11 to run ZooKeeper (3.5), Hadoop HDFS/YARN/MR (2.10 and 3.3), and > HBase (2.4) is a nonissue. These software versions are stable under load. > Most recently I tested scale ingest with 11.0.15+1, hot off the presses so > to speak. No issues to report — although, I cannot claim this is the > production configuration where I work yet. Perhaps near the end of 2022. > Anyway, I think mine is likely not the only experience like this so the > hedging language can be removed from the text, especially if someone else > writes in with positive testimonial. > > Regarding the original question, I would be in favor of the proposal. Time > matches on. I assume just to state the obvious that our destination of > minimum LTS would shift from 8 to 11. > > I also agree it would be good to move up from EOL or soon to be EOL > versions of our dependencies. Looks like ZooKeeper 3.6 will be the lowest > live code line by the end of this year. Hadoop 2 isn’t exactly dead, at > least the source branch is still receiving occasional update, but is not > releasing. We should probably consider it effectively EOL. The Hadoop > minimum could become 3.3. The primary consideration to my mind is the state > of S3A: in what version it can be said to be stable and feature complete. I > think 3.3 is the appropriate code line for that criteria but perhaps 3.2 > could serve as well. > > > On Feb 15, 2022, at 10:48 AM, Sean Busbey <bus...@apache.org> wrote: > > > > Hi folks! > > > > It's been some time since we decided to stick to LTS JDK releases as a > way > > of getting a handle on the JDK treadmill. > > > > What do folks think about deprecating JDK8? The openjdk8u project is > still > > going and there are commercial support options at least through 2030. > > > > Deprecating it in HBase 3 would mean we could remove it in HBase 4, not > > that we would _have_ to remove it. The way I think about likely timing of > > these events goes like this: > > > > * HBase 2 started alphas in June 2017, betas in January 2018, and came > out > > in April 2018 > > * HBase 3 started alphas in July 2021, and as of Feb 2022 we haven't > > discussed how close we are to our stated beta goals (upgrades from active > > 2.x releases and removal of not-ready features). > > > > Given the above, in the absence of us specifically pushing to roll > through > > major version numbers for some reason, I think a reasonably conservative > > estimate is for HBase 3 to arrive in late 2022 or early 2023 and then > HBase > > 4 to start alphas in ~2025. An HBase 5 prior to 2030 seems unlikely. > > > > That all said, our current reference guide section on java versions does > > not sound very confident about JDK11 support. > > > >> A Note on JDK11 * > >> Preliminary support for JDK11 is introduced with HBase 2.3.0. This > > support is limited to > >> compilation and running the full test suite. There are open questions > > regarding the runtime > >> compatibility of JDK11 with Apache ZooKeeper and Apache Hadoop > > (HADOOP-15338). > >> Significantly, neither project has yet released a version with explicit > > runtime support for > >> JDK11. The remaining known issues in HBase are catalogued in > HBASE-22972. > >> > > > > Since that blurb was written, Hadoop has added JDK11 support [1] as has > > ZooKeeper[2]. As a part of buttoning up our JDK11 support we could update > > our minimum supported versions of these projects to match that support. > > > > What do folks think? > > > > [1]: https://hadoop.apache.org/docs/r3.3.0/index.html > > [2]: > > https://zookeeper.apache.org/doc/r3.6.0/zookeeperAdmin.html#sc_systemReq >
