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The OODT File Manager is only compatible with a Solr version of 4.X or above - i.e. no support is provided for interacting with pre-existing Solr installations of 3.X or below. The technical motivation is that the Solr implementation of the OODT Catalog interface relies heavily on the "atomic update" functionality that was introduced in Solr 4 - i.e. the ability to update single parts of a Solr document without the need to re-index the whole document. The logical rationale behind this decision is that this is a new functionality provided to the OODT framework, and consequently there is no need to support legacy deployments: a project that wishes to leverage this architecture might as well start anew with the most up to date version of Solr, instead of installing an older version.

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