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Data Import Handler

An Apache Solr™ package for importing records from database systems into Apache Solr collections.

DIH Build

About

This is a 3rd party package for Apache Solr, aiming at maintaining the Data Import Handler since it will no longer ship with the default Solr download in the future.

The success of this project relies on contributions from the broader community through Pull Requests. See "Issues" sections and help in any way you see fit.

Installing and running

  • Start Solr (version 9.X master) nodes with -Denable.packages=true

    bin/solr -c -Denable.packages=true

  • Add repository:

    bin/solr package add-repo data-import-handler "https://raw.githubusercontent.com/searchscale/dataimporthandler/master/repo/"

  • See available packages:

    bin/solr package list-available

  • Install the package

    bin/solr package install data-import-handler

  • Create a products collection

    curl "http://localhost:8983/solr/admin/collections?action=CREATE&name=products&numShards=1"

  • Deploy package on the collection

    bin/solr package deploy data-import-handler -y -collections products

  • Create the DB configurations file

    Create a new file data-config.xml:

    <dataConfig>
    <dataSource type="JdbcDataSource" driver="org.mariadb.jdbc.Driver" 
            url="jdbc:mysql://localhost/myproducts" user="root" password="password"/>
    <document>
        <entity name="product" query="select ProductID AS id, Name as name_t from products"></entity>
    </document>
</dataConfig>

  • Add the configurations and reload the collection

    ./server/scripts/cloud-scripts/zkcli.sh -z localhost:9983 -cmd putfile "/configs/products.AUTOCREATED/data-config.xml" data-config.xml

    curl "localhost:8983/solr/admin/collections?action=RELOAD&name=products"

  • Run data import

    curl http://localhost:8983/solr/products/dataimport?command=full-import

    curl "http://localhost:8983/solr/products/select?q=*:*"

Use DIH to import from Snowflake into Solr

Configurations

  1. solr-security-policy : Following permissions should be configured in solr for the Snowflake JDBC driver to be accessible at runtime. The security config file is under /solr/server/etc/security.policy
permission java.security.SecurityPermission "putProviderProperty.BC";
permission java.io.FilePermission "/home/ubuntu/ec2user/caches/Snowflake", "read,write,delete";
permission java.io.FilePermission "/home/ubuntu/ec2user/caches/Snowflake/*", "read,write,delete";
  1. Data Config Snowflake JDBC Driver
<dataConfig>
        <dataSource type="JdbcDataSource" driver="net.snowflake.client.jdbc.SnowflakeDriver" url="jdbc:snowflake://host:443?db=<>;warehouse=<>;schema=<>;role=<>;account=<>" user="<>" password="<>">
        </dataSource>
        <document>
                <entity name="table_name" query="select id, name from table_name">
                        <field column="id" name="id" ></field>
                        <field column="name" name="name" ></field>
                </entity>
        </document>
</dataConfig>

  • Replace the "driver" url with the host, port, database schema and user credentials.

  • The password can to be encrypted as per the docs

  • Use explicit (non-dynamic) fields in Solr schema, that need to be mapped to snowflake.

  • Partial updates are not supported by default. Use script processor to implement partial updates. Add the attribute transformer="script:DeltaIndexTransformer" to the entity of the DIH. For example :

 <script><![CDATA[
                function DeltaIndexTransformer(row) {
                    row.keySet().forEach(function (field) {
                        if (field != 'id') {
                            value = row.get(field);
                            row.put(field, {
                                'set': value,
                            });
                        }
                    });
                    return row;
                }
                ]]></script>

Contributing

The source code for DIH versions that are compatible with Solr 8.x are in branch_8x branch (branch_9x for Solr 9.x). Please feel free to open issues and/or open pull requests against that branch.

Known Issues

  • Only MariaDB connector supported out-of-the-box right now. The connectors to be used need to be shipped as part of this package, and currently only MariaDB connector is shipped.

  • Solr Admin UI's Dataimport tab could be a bit glitchy when used with this package

Attribution

The code in this repository was originally a fork of the original DIH code in Solr project and the original code is (C) Apache Software Foundation.

Additional work done in this repository is (C) the respective authors and licensed under the Apache License 2.0.