Because ZFS is transaction, (effectively preserves order), the rename trick
will work.
If you find the ".filename" delete create a new ".filename" and when finish
writing rename it to "filename". If "filename" exists you no all writes were
completed. If you have a batch system which looks for the file it will not find
it until it is renamed. Not that I am a of batch systems which use CPU poll
for files existance.
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