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Solr upgrade (WIP)

Findings

Solr is distributed on Maven Central as a .war file, which includes the Lucene .jars. No Lucene version relevant to DSpace is available from Maven Central.

Solr is a wrapper for Lucene providing concurrency. Lucene can work with index files directly if we don't need concurrent access (i.e. before we start up Solr).

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  1. detect the index version using getCurrentVersion(index_dir)
  2. for any version older than LUCENE_35 go to 3, otherwise go to 7
  3. get the Solr 3.5 war from Maven Central extract the lucenelucene-core-3.5.0.jar from the Solr 3.5 war from Maven Central
  4. run the IndexUpgrader class of Lucene 3.5 (or optimize())
  5. start up DSpace in order to start up Solr 4
  6. run the IndexUpgrader class of Lucene 4.4

The manual steps would be:

Code Block
mkdir solr-3.5.0
cd solr-3.5.0
wget "http://search.maven.org/remotecontent?filepath=org/apache/solrlucene/solrlucene-core/3.5.0/solrlucene-core-3.5.0.warjar" -O solr-3.5.0.war
unzip solrlucene-core-3.5.0.war
cd WEB-INF/lib/jar
# check index version, see table below:
java -cp lucene-core-3.5.0.jar org.apache.lucene.index.CheckIndex /dspace/solr/statistics/data/index/
java -cp lucene-core-3.5.0.jar org.apache.lucene.index.CheckIndex  /dspace/solr/search/data/index/
# upgrade index version:
java -cp lucene-core-3.5.0.jar org.apache.lucene.index.IndexUpgrader /dspace/solr/statistics/data/index/
java -cp lucene-core-3.5.0.jar org.apache.lucene.index.IndexUpgrader /dspace/solr/search/data/index/
# check index version again, should be "version=3.5 format=FORMAT_3_1 [Lucene 3.1+]"

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