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Shawn Heisey commented on SOLR-2204:
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All of the Solr documentation I've read says that you're supposed to upgrade your slaves first,
test it completely, then upgrade your masters. This is a sensible approach, but it's impossible
currently.
We can't do complete tests of our application against a single test server, we need to test
against the entire distributed index. The amount of hardware required for an entire copy
of the index costs too much to have in a lab environment.
> Cross-version replication broken by new javabin format
> ------------------------------------------------------
>
> Key: SOLR-2204
> URL: https://issues.apache.org/jira/browse/SOLR-2204
> Project: Solr
> Issue Type: Bug
> Components: replication (java)
> Affects Versions: 3.1
> Environment: Linux idxst0-a 2.6.18-194.3.1.el5.centos.plusxen #1 SMP Wed May
19 09:59:34 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
> java version "1.6.0_20"
> Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
> Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01, mixed mode)
> Reporter: Shawn Heisey
> Fix For: Next
>
>
> Slave server is branch_3x, revision 1027974. Master server is 1.4.1. Replication fails
because of the new javabin format.
> SEVERE: Master at: http://HOST:8983/solr/live/replication is not available. Index fetch
failed. Exception: Invalid version or the data in not in 'javabin' format
> Switching Solr's internally generated requests to XML, or adding support for both javabin
versions would get rid of this problem. I do not know how to do either of these things.
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