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 );