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Posted to notifications@accumulo.apache.org by "Christopher Tubbs (JIRA)" <ji...@apache.org> on 2013/01/25 22:59:13 UTC
[jira] [Resolved] (ACCUMULO-751) Support Wire Compatibility
(between bugfix releases)
[ https://issues.apache.org/jira/browse/ACCUMULO-751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Christopher Tubbs resolved ACCUMULO-751.
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Resolution: Fixed
> Support Wire Compatibility (between bugfix releases)
> ----------------------------------------------------
>
> Key: ACCUMULO-751
> URL: https://issues.apache.org/jira/browse/ACCUMULO-751
> Project: Accumulo
> Issue Type: Improvement
> Components: master, thrift, tserver
> Affects Versions: 1.4.0
> Reporter: Mike Drob
> Assignee: Christopher Tubbs
> Priority: Critical
> Labels: api, compatibility, versioning, wire, wireprotocol
> Fix For: 1.5.0
>
>
> With the advent of the HA NameNode in HDFS, the need for planned Hadoop outages has greatly diminished. I believe that Accumulo should follow suit and eventually allow for no-outage upgrades.
> To support this feature, we would require wire compatibility between different versions so that the cluster can continue to function in a mixed state. There are already contingencies for master fail-over and tservers to leave/join the cluster, so I think this is a natural extension of that code.
> To accomplish this for bugfix releases should be trivial. I think it is only necessary to remove (or relax) the version check that happens when a tserver attempts to join. There are rarely (never?) changes to the thrift protocol between bugfix releases, so theoretically a 1.4.1 tserver is already compatible with a 1.4.0 master and vice versa.
> To maintain compatibility in the face of thrift protocol changes is certainly a harder challenge, which might be best reserved for a separate ticket.
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