Problem

How do you control where spilltodisk writes its temporary files instead of having them all written to /var/tmp/-bigmsg as is the default?

Resolution

You can control the location by adding a tempdir parameter similar to the sample below to the instance's service.xml file, e.g. $VDISTDIR/groups/group-X/instance-Y/conf/service.xml

    <SystemSettings tracelevel="INFO" secret="${secret}"
        serviceID="${serviceID}" groupID="${groupID}"
        serviceName="${serviceName}" groupName="${groupName}"
        domainID="${domainID}" title="API Gateway" tempdir="/var/example/spilltodisk"/>

Further documentation on the spilltodisk setting, which writes large messages to temporary files to save memory, can be found in the Administrator's Guide for your version.