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Install and Configure Additional Extractor Instance for High Availability (Linux)

The following guide gives detailed instructions on how to install an additional extractor instance for high availability (worker server) on Linux.

Prerequisites for installing an additional extractor instance

Make sure that you have followed the suggested prerequisites defined in the section PoolParty System Requirements.

These installation instructions assume that a PoolParty standard installation will be made using the following options:

  • You have defined a user (e.g. 'poolparty') on the server assigned to a respective group (e.g. poolparty) that should be used to run the Tomcat server and that user is able to execute the sudo command.

  • The target system is running on a 64-bit Linux server.

  • PoolParty Tomcat will be running as localhost using port 80.

  • PoolParty's built in Apache Solr server will be running as localhost using port 8983.

  • PoolParty installer (PoolParty.run) has been downloaded from our download area.

Note

You can create a user with useradd -g poolparty -G sudo poolparty

Master configuration
STEP 1: Ensure solrconfig.xml Is Set to Master for Replication

  • Navigate to each core solrconfig.xml file and ensure the correct settings are enabled for master replication.

  • You can find the files in the following directory: <PPAppDir>/data/solr/{corename}/conf/

  • Ensure the request handler is set to the following:

<requestHandler name="/replication" class="solr.ReplicationHandler">
           <lst name="master">
             <str name="replicateAfter">commit</str>
             <str name="replicateAfter">startup</str>
             <str name="confFiles">schema.xml,stopwords.txt</str>
           </lst>
    </requestHandler>
Worker configuration
STEP 1: Clean up Core Folders

  • Navigate to <PPAppDir>/data/solr/ and simply delete all files and folders located here.

  • Extract thesolr-template.tgz and replace the files inside <PPAppDir>/data/solr/

STEP 2: Open the solrcore.properties File and Adapt Your Configuration Settings

solrcore.properties will pass the configuration settings to all the necessary cores:

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STEP 3: Start Worker Server

Open a console and change to root:

sudo -i

Change the ownership of the modified solr directory and make infrastructure scripts and binaries executable:

chown -R poolparty:poolparty /opt/poolparty/data/solr
chmod a+x <PPAppDir>/bin/*

Start Solr: <PPAppDir>/bin/solr start

Start PoolParty: <PPAppDir>/bin/poolparty start

Note

In case tfidf was calculated on master server you should also include tfidf core into replication configuration.

Post-installation check

You can check your system, following this procedure: Controlling the Status of Solr Replication

In this section: