paul-rogers commented on pull request #2192:
URL: https://github.com/apache/drill/pull/2192#issuecomment-811676260
One other thought on the compatibility issue. We can perhaps fudge it here
as we discussed. Perhaps it make sense to fix it correctly:
* Store a version number in the "persistent store" (ZK) each time we write
to the store. This can't be a product version, it must be a persistent store
format version. (Why? So you can change things in the SNAPSHOT release.)
* On each startup, check the persistent store version. If it is less than
the current version, run an upgrade process. In particular, invoke a
`versionxToy` conversion for each 'x' from the current store version to the
current software version.
* In each conversion, look for changed configs and "do the right thing." For
this PR, it would mean changing the plugin name and rewriting one of them
("pcap-ng" maybe) as needed. In some cases, it might mean deleting an
unsupported plugin. Etc.
The wise thing would be to log the original JSON and any changes, so if
things go wrong (and they will), there is a way to recover.
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