Solr Search Index

A Dataverse installation requires Solr to be operational at all times. If you stop Solr, you should see an error about this on the root Dataverse installation page, which is powered by the search index Solr provides. You can set up Solr by following the steps in our Installation Guide’s Prerequisites and Configuration sections explaining how to configure it. This section you’re reading now is about the care and feeding of the search index. PostgreSQL is the “source of truth” and the Dataverse installation will copy data from PostgreSQL into Solr. For this reason, the search index can be rebuilt at any time. Depending on the amount of data you have, this can be a slow process. You are encouraged to experiment with production data to get a sense of how long a full reindexing will take.

Full Reindex

There are two ways to perform a full reindex of the Dataverse installation search index. Starting with a “clear” ensures a completely clean index but involves downtime. Reindexing in place doesn’t involve downtime but does not ensure a completely clean index (e.g. stale entries from destroyed datasets can remain in the index).

Clear and Reindex

Index and Database Consistency

Get a list of all database objects that are missing in Solr, and Solr documents that are missing in the database:

curl http://localhost:8080/api/admin/index/status

Remove all Solr documents that are orphaned (i.e. not associated with objects in the database):

curl http://localhost:8080/api/admin/index/clear-orphans

Clearing Data from Solr

Please note that the moment you issue this command, it will appear to end users looking at the root Dataverse installation page that all data is gone! This is because the root Dataverse installation page is powered by the search index.

curl http://localhost:8080/api/admin/index/clear

Start Async Reindex

Please note that this operation may take hours depending on the amount of data in your system and whether or not you installation is using full-text indexing. More information on this, as well as some reference times, can be found at https://github.com/IQSS/dataverse/issues/50.

curl http://localhost:8080/api/admin/index

Reindex in Place

An alternative to completely clearing the search index is to reindex in place.

Clear Index Timestamps

curl -X DELETE http://localhost:8080/api/admin/index/timestamps

Start or Continue Async Reindex

If indexing stops, this command should pick up where it left off based on which index timestamps have been set, which is why we start by clearing these timestamps above. These timestamps are stored in the dvobject database table.

curl http://localhost:8080/api/admin/index/continue

Manual Reindexing

If you have made manual changes to a dataset in the database or wish to reindex a dataset that Solr didn’t want to index properly, it is possible to manually reindex Dataverse collections and datasets.

Reindexing Dataverse Collections

Dataverse collections must be referenced by database object ID. If you have direct database access an SQL query such as

select id from dataverse where alias='dataversealias';

should work, or you may click the Dataverse Software’s “Edit” menu and look for dataverseId= in the URLs produced by the drop-down. Then, to re-index:

curl http://localhost:8080/api/admin/index/dataverses/135

which should return: {“status”:”OK”,”data”:{“message”:”starting reindex of dataverse 135”}}

Reindexing Datasets

Datasets may be referenced by persistent ID or by database object ID. To re-index by persistent ID:

curl http://localhost:8080/api/admin/index/dataset?persistentId=doi:10.5072/FK2/AAA000

To re-index a dataset by its database ID:

curl http://localhost:8080/api/admin/index/datasets/7504557

Manually Querying Solr

If you suspect something isn’t indexed properly in Solr, you may bypass the Dataverse installation’s web interface and query the command line directly to verify what Solr returns:

curl "http://localhost:8983/solr/collection1/select?q=dsPersistentId:doi:10.15139/S3/HFV0AO"

to see the JSON you were hopefully expecting to see passed along to the Dataverse installation.