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From "Sam Tunnicliffe (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-9761) Delay auth setup until peers are upgraded
Date Wed, 09 Sep 2015 16:01:46 GMT


Sam Tunnicliffe commented on CASSANDRA-9761:

After my conscience (aka [~thobbs]) got the better of me, I've pushed 3.0 and trunk versions
for CI. 

Results will be at:
* [3.0 testall|]
* [3.0 dtest|]
* [trunk testall|]
* [trunk dtest|]

> Delay auth setup until peers are upgraded
> -----------------------------------------
>                 Key: CASSANDRA-9761
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Sam Tunnicliffe
>            Assignee: Sylvain Lebresne
>             Fix For: 3.0.0 rc1, 2.2.2
> The built in auth classes {{CassandraRoleManager}} and {{CassandraAuthorizer}} both attempt
to do some setup and data conversion when a node is upgraded to version 2.2 or higher. At
the moment, each node attempts the operations with the expectation that this will fail until
enough of the cluster has been upgraded for it to succeed (i.e. enough nodes have the latest
schema with the requisite new tables). These expected failures are largely harmless, but they
are annoying because they cause the receiving node (the non-upgraded node) to close the connection
with the upgraded node, which then has to be restablished. Although this is the normal behaviour
on schema disagreement (see CASSANDRA-9136 for further discussion), it may be possible to
avoid in this specific circumstance. Given that we expect the operations to fail until enough
nodes are upgraded, we could defer them until we're sure they can succeed by checking the
messaging service version of peers. 
> Right now these are a one shot thing, each node only makes one attempt at the conversion
(until it is restarted). Without investigating further, I don't know if we'd need to add in
retries in case it takes a little time for each peer's MS version to be updated as they're
upgraded. The setup & conversion operations are idempotent, so there shouldn't be a great
issue if several nodes  attempt them at the same time anyway.

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