Just to update this thread status. Correct way to achieve the zooming is to use a command line parameter --scale=x or programmatically use
display.getDisplayHost().setScale(2.0d);
window.open(display);
For fore information, see
https://issues.apache.org/jira/browse/PIVOT-966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14534177#comment-14534177.
