keith-turner opened a new issue, #4268:
URL: https://github.com/apache/accumulo/issues/4268
If someone with an Accumulo 2.1 cluster does the following it would be good
if the last step failed.
1. Upgrades Accumulo from 2.1 to 3.1
2. Accidentally starts a 2.1 accumulo process after the upgrade.
It seems like [this
code](https://github.com/apache/accumulo/blob/ee7ae63a823477b557aa9415a92653e95aa64cb1/server/base/src/main/java/org/apache/accumulo/server/ServerContext.java#L298)
should cause the server process started in step 2 above to fail. Having an
integration test for this would be useful given how disruptive older code
running against new data and metadata could be. The following is an outline of
a possible integration test.
1. Create a 2.1 mini accumulo cluster
2. Stop all accumulo processes
3. In the test code, modify the data version in hdfs to add one to whatever
is there
4. Attempt to start each kinds of accumulo server processes and verify that
they exit with an error code.
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