TokuFT file system space is low

I am getting error while loading sql file

ERROR 1021 (HY000) at line 94222: Disk full (IFT_OBUMESSAGE_DTL); waiting for someone to free some space…

Space Left : /dev/sda3 1.7T 1.5T 83G 95% /

In error Log :
Mon Sep 21 14:23:10 2015 TokuFT file system space is low
Mon Oct 12 13:08:21 2015 TokuFT file system space is really low and access is restricted
Mon Jan 18 20:21:54 2016 TokuFT file system space is low
Sat Jan 23 22:22:12 2016 TokuFT file system space is really low and access is restricted
Wed Jan 27 04:06:37 2016 TokuFT file system space is really low and access is restricted

83 GB Space left still Getting Error ?

Don’t know this is Bug or feature , I have look tokudb show disk space full after 95% full of disk space

Set tokudb_fs_reserve_percent variable to 0.
Source: https://www.percona.com/doc/percona-tokudb/variables.html#mysql-server-variables