One the issues with current FITS (1.2.0) it that it during the TECHMD generation Apache Tika is executed on Binaries resulting in huge/large amount of temporary file(s), much larger than original datastreams that are checked againts. This can lead, on large ingest sets to temporary out of space situations. Normal /tmp cleanup routines found on Ubuntu are not able to deal with this files.
<!-- Comment tika processing or your /tmp file will fill up sooo fast!
<tool class="edu.harvard.hul.ois.fits.tools.tika.TikaTool" exclude-exts="jar,avi,mov,mpg,mpeg,mkv,mp4,mpeg4,m2ts,mxf,ogv,mj2,divx,dv,m4v$
-->
This has issue has been replicated by Samvera users/DGI and Metro (all with different levels of frustration)
Omit the warning message at will.
Execute any derivative regeneration on Objects where TECHMD processing is enabled. Look at your /tmp folder for apache-tika files.