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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3590) Rolling upgrade support
Date Fri, 22 Jul 2016 06:11:20 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15388978#comment-15388978
] 

Christopher Tubbs commented on ACCUMULO-3590:
---------------------------------------------

{{instance.*}} properties are for properties which should be consistent across a cluster.
Most new properties we add between versions should fall into {{general.*}} instead.

The main thing that changes between versions affecting the {{SystemToken}} is going to be
the "wire version", which is part of the token to prevent cross-communication between incompatible
versions with respect to the RPC layer.

> 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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