Hi @spanda
There should not be any left-overs after it has generated the XLSX export, so something else must be going wrong, which causes it to fail cleanup.
Yes, those are related to XLSX export, like I mentioned in Metabase Crashes After Performing Export
And yes, you can change the Java temp directory: https://stackoverflow.com/questions/1924136/environment-variable-to-control-java-io-tmpdir
But changing the temp directory is not the solution. You'll need to figure out what is causing it to not cleanup correctly.