keith-turner commented on PR #3230:
URL: https://github.com/apache/accumulo/pull/3230#issuecomment-1538856316
> The pre-upgrade stage was added to support code / checks that are likely
independent of a specific version.
Yeah if the data is the same across the two versions then we do not need to
push anything to the Upgrader. I was thinking we had changed how lock data is
stored in ZK. That may be between 2.0 and 2.1 though, not for 2.1 to 3.0.
> The ability to communicate with a tserver seems to also fit within this
category. Before anything happens that is dependent on version, this check
would establish a baseline of "at least I can talk to all of the registered
tservers" before any version dependent code would have a chance to run.
We could also possibly add something to ServiceLockData that could be used
to check if a lock on ZK is associated with something running an older code
version. That could be done in addition to or instead of attempting to make a
RPC.
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