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https://issues.apache.org/jira/browse/SOLR-2204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13140184#comment-13140184
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Mike Sokolov commented on SOLR-2204:
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As a practical matter, it would be pretty useful for folks performing upgrades
to have this backwards compatibility available. In fact I think in the long
term that providing back compat would actually help to *reduce* the total
amount of CESU on the wire since it will make the upgrade path easier. I
understand the appeal of the clean-slate idea; the previous format may have
been broken (or easy to get wrong), but the fact is that it is still in wide
use, and that can't be changed overnight simply by refusing to support it.
Consider the change from SSH1 to SSH2: the earlier format was not really
secure, but ssh continues to support a negotiation protocol for
interoperability with old clients and servers, with user-settable options to
control the negotiation process.
> 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: 3.5, 4.0
>
> Attachments: SOLR-2204.patch, SOLR-2204.patch
>
>
> 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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