My understanding is that the upgrade of ZK is pretty easy... but I would consult the ZooKeeper community for advice on that, since they are the experts. For Accumulo's part, I believe 2.0 worked fine with newer versions of ZK (3.5+), so you should be able to update ZK first if you didn't want to do them at the same time. There may be some things you might need to do to ensure your classpath is set up correctly for Accumulo if using it with 2.0, since 2.0 might assume ZK 3.4 jar locations. I don't recall the specifics, but I remember it wasn't that bad. fluo-uno had used newer ZK versions with 2.0 for a while. The necessary config changes to support that might even still be scripted in its repo.
I'm really not familiar with Hadoop upgrades, but as far as Accumulo is concerned, it would probably treat both 3.3.1 and 3.3.5 as essentially equivalent. I don't think anything substantially changed that would cause Accumulo to even notice a difference. Seems like it would just be a quick shutdown, update the classpath, restart, for Accumulo. For Hadoop, you may have some upgrade tasks... I'd check with the Hadoop community first. You could probably upgrade Hadoop before or after you upgrade Accumulo for this one. I don't think it's going to matter much. If you're concerned about problems you might encounter, I would run through the upgrades on a small test instance first, just to practice. If you run into a specific problem doing that, we could probably offer more specific insight, having probably seen it before. On Wed, Aug 30, 2023 at 4:50 PM Vincent Russell <vincent.russ...@gmail.com> wrote: > > Thank you Christopher. > > Does there exist some documentation for upgrading zookeeper from 3.4.14 to > 3.8.1? Is there a preferred upgrade path? > > Also...Is there any documentation on how this affects hadoop when using > high availability? We are using hadoop 3.3.1. I want to upgrade to > hadoop 3.3.5, but I didn't know if that should be done as part of upgrading > accumulo or later. > > Any experience folks have would be greatly appreciated. > > Thank you, > Vincent > > On Thu, Aug 24, 2023 at 12:58 PM Christopher <ctubb...@apache.org> wrote: > > > The correct link seems to be > > > > https://accumulo.apache.org/docs/2.x/troubleshooting/zookeeper#zookeeper-acls > > > > It looks like both `bin/accumulo dump-zoo` and `bin/accumulo-util > > dump-zoo` will do the same thing. It was originally a disconnected > > utility that existed for convenience, but was incorporated into our > > regular tooling recently as part of an effort to make all these > > utilities more easily discoverable and executable. I don't think we > > realized that it already had a convenient and documented entry point. > > We were just looking for utilities with a "main" method. Either should > > work fine. They call the same code. > > > > On Thu, Aug 24, 2023 at 11:04 AM Vincent Russell > > <vincent.russ...@gmail.com> wrote: > > > > > > Also the link to: > > > > > > https://accumulo.apache.org/docs/2.x/troubleshooting/ZooKeeper#ACLs > > > > > > is not resolving. > > > > > > What needs to be done at this step? > > > > > > > > > Thanks, > > > Vincent > > > > > > > > > On Thu, Aug 24, 2023 at 10:36 AM Vincent Russell < > > vincent.russ...@gmail.com> > > > wrote: > > > > > > > Hello, > > > > > > > > I'm practicing going to the upgrade instructions from 2.0.1 to 2.1.1 > > and I > > > > wanted to confirm that the zoo-dump command is run via the > > accumulo-util > > > > command and not via accumulo. > > > > > > > > The instructions say: > > > > > > > > $ACCUMULO_HOME/bin/accumulo dump-zoo --xml --root /accumulo | tee > > > > PATH_TO_SNAPSHOT > > > > > > > > Thank you, > > > > Vincent > > > > > >
