Hi, I’m not sure if I should be responding here or starting a new thread, but I am having the same problem. Using qiime2-2019.7 on Ubuntu 18.04 installed using conda.
I have set TMPDIR to a new location, but the error still says "not enough space left on /tmp. I have tried setting TMPDIR with and without exporting it, but that doesn’t seem to make a difference. I have tried reducing the number of processors to 1, or reducing the batch size, but neither of those help. My root partition is pretty small, so it really would be best if I could convince the classifier to use a different tmp directory.