We have set workbook window size to -1 // -1 turn off auto-flushing and Called workbook.dispose(); Also called workbook.setCompressTempFiles(true); But still we see huge file (few GB) created at /tmp dir - when we tried to write ~ 142 K Excel rows. Causing the /tmp FS to full.
Please try with 3.11 beta 2 - does that help?
No update for a long time, therefore closing this as WORKSFORME for now, please reopen if this is still a problem for you.