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https://issues.apache.org/jira/browse/ACCUMULO-3590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15388332#comment-15388332
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Josh Elser commented on ACCUMULO-3590:
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bq. The SystemToken is created using properties of 'instance' to create a hash.
Some of these properties are created by default creating a unique hash between
different versions.
Oh, we added new "instance.*" properties to the configuration between 1.6 and
1.7? Bummer. We'll probably have to rethink how we compute the SystemToken in
the future to account for this scenario. Probably another sub-task for this
umbrella.
> Rolling upgrade support
> -----------------------
>
> Key: ACCUMULO-3590
> URL: https://issues.apache.org/jira/browse/ACCUMULO-3590
> Project: Accumulo
> Issue Type: Improvement
> Reporter: Josh Elser
> Fix For: 1.9.0
>
>
> We really lack any support for rolling upgrades between versions of Accumulo.
> Need to have a way to provide seamless upgrades between certain versions of
> Accumulo which minimize any downtime/impact on users of the system.
> Need to cover fundamental control features (like a rolling upgrade), changes
> to our serialized data structures (help prevent us from goofing up
> serialization across versions -- thrift/protobuf/etc), backwards/forward
> compatible RFile and WAL support (including control), lots of tests, and lots
> of documentation.
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