populateLogUsertext.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class PopulateLogUsertext extends LoggedUpdateMaintenance {
    public function __construct() {
        parent::__construct();
        $this->mDescription = "Populates the log_user_text field";
        $this->setBatchSize( 100 );
    }

    protected function getUpdateKey() {
        return 'populate log_usertext';
    }

    protected function updateSkippedMessage() {
        return 'log_user_text column of logging table already populated.';
    }

    protected function doDBUpdates() {
        $db = $this->getDB( DB_MASTER );
        $start = $db->selectField( 'logging', 'MIN(log_id)', false, __METHOD__ );
        if ( !$start ) {
            $this->output( "Nothing to do.\n" );
            return true;
        }
        $end = $db->selectField( 'logging', 'MAX(log_id)', false, __METHOD__ );

        # Do remaining chunk
        $end += $this->mBatchSize - 1;
        $blockStart = $start;
        $blockEnd = $start + $this->mBatchSize - 1;
        while ( $blockEnd <= $end ) {
            $this->output( "...doing log_id from $blockStart to $blockEnd\n" );
            $cond = "log_id BETWEEN $blockStart AND $blockEnd AND log_user = user_id";
            $res = $db->select( array( 'logging', 'user' ),
                array( 'log_id', 'user_name' ), $cond, __METHOD__ );

            $db->begin( __METHOD__ );
            foreach ( $res as $row ) {
                $db->update( 'logging', array( 'log_user_text' => $row->user_name ),
                    array( 'log_id' => $row->log_id ), __METHOD__ );
            }
            $db->commit( __METHOD__ );
            $blockStart += $this->mBatchSize;
            $blockEnd += $this->mBatchSize;
            wfWaitForSlaves();
        }
        $this->output( "Done populating log_user_text field.\n" );
        return true;
    }
}

$maintClass = "PopulateLogUsertext";
require_once RUN_MAINTENANCE_IF_MAIN;