+ if ( $backgroundMode ) {
+ $this->output( "Using replication-friendly background mode...\n" );
+
+ $dbr = wfGetDB( DB_SLAVE );
+ $chunkSize = 100;
+ $lastUser = $dbr->selectField( 'user', 'MAX(user_id)', '', __METHOD__ );
+
+ $start = microtime( true );
+ $migrated = 0;
+ for ( $min = 0; $min <= $lastUser; $min += $chunkSize ) {
+ $max = $min + $chunkSize;
+ $result = $dbr->query(
+ "SELECT
+ user_id,
+ COUNT(rev_user) AS user_editcount
+ FROM $user
+ LEFT OUTER JOIN $revision ON user_id=rev_user
+ WHERE user_id > $min AND user_id <= $max
+ GROUP BY user_id",
+ __METHOD__ );
+
+ foreach ( $result as $row ) {
+ $dbw->update( 'user',
+ array( 'user_editcount' => $row->user_editcount ),
+ array( 'user_id' => $row->user_id ),
+ __METHOD__ );
+ ++$migrated;
+ }
+
+ $delta = microtime( true ) - $start;
+ $rate = ( $delta == 0.0 ) ? 0.0 : $migrated / $delta;
+ $this->output( sprintf( "%s %d (%0.1f%%) done in %0.1f secs (%0.3f accounts/sec).\n",
+ wfWikiID(),
+ $migrated,
+ min( $max, $lastUser ) / $lastUser * 100.0,
+ $delta,
+ $rate ) );
+
+ wfWaitForSlaves( 10 );
+ }
+ } else {
+ // Subselect should work on modern MySQLs etc
+ $this->output( "Using single-query mode...\n" );
+ $sql = "UPDATE $user SET user_editcount=(SELECT COUNT(*) FROM $revision WHERE rev_user=user_id)";
+ $dbw->query( $sql );
+ }
+
+ $this->output( "Done!\n" );
+ }
+}