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From "Stanislav Lukyanov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-10900) Print a warning if native persistence is used without an explicit consistent ID
Date Fri, 11 Jan 2019 14:53:00 GMT
Stanislav Lukyanov created IGNITE-10900:
-------------------------------------------

             Summary: Print a warning if native persistence is used without an explicit consistent
ID
                 Key: IGNITE-10900
                 URL: https://issues.apache.org/jira/browse/IGNITE-10900
             Project: Ignite
          Issue Type: Bug
            Reporter: Stanislav Lukyanov


Experience shows that when Native Persistence is enabled, it is better to explicitly set ConsistentIDs
than use the autogenerated ones.

First, it simplifies managing the baseline topology. It is much easier to manage it via control.sh
when the nodes have stable and meaningful names.

Second, it helps to avoid certain shoot-yourself-in-the-foot issues. E.g. if one loses all
the data of a baseline node, when that node is restarted it doesn't have its old autogenerated
consistent ID - so it is not a part of the baseline anymore. This may be unexpected and confusing.

Finally, having explicit consistent IDs improves the general stability of the setup - one
knows what the the set of nodes, where they run and what they're called.

All in all, it seems beneficial to urge users to explicitly configure consistent IDs. We can
do this by introducing a warning that is printed every time a new consistent ID is automatically
generated. It should also be printed when a node doesn't have an explicit consistent ID and
picks up one from an existing peristence folder.



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