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https://issues.apache.org/jira/browse/SOLR-3038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13258364#comment-13258364
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Uwe Schindler commented on SOLR-3038:
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bq. with XML, it it can read pre 3.x – the compatibility problem is with javabin
No, as any Solr 4.x server will throw IndexTooOldException when opening
IndexReader/IndexWriter on top of a old index format. Lucene 4.x drops support
for pre-3.0 indexes (and Solr 1.4 is Lucene 2.9).
To Upgrade from Solr 1.x to Solr 4.x, you have to transform your indexes using
a Lucene 3.x JAR and calling IndexUpgrader, to bring a pre-3.0 Index to 3.x
format so 4.0 can read it.
> Solrj should use javabin wireformat by default with updaterequests
> ------------------------------------------------------------------
>
> Key: SOLR-3038
> URL: https://issues.apache.org/jira/browse/SOLR-3038
> Project: Solr
> Issue Type: Improvement
> Components: clients - java
> Affects Versions: 4.0
> Reporter: Sami Siren
> Priority: Minor
>
> The javabin wire format is faster than xml when feeding Solr - it should
> become the default.
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