In the process of deleting and it will not complete. details below 

command: 

sudo -u hdfs hdfs fsck / -delete

Results:

Total size: 862598231657 B
Total dirs: 92216
Total files: 185059
Total symlinks: 0 (Files currently being written: 19)
Total blocks (validated): 179550 (avg. block size 4804222 B) (Total open file blocks (not validated): 3)
********************************
UNDER MIN REPL'D BLOCKS: 25855 (14.399889 %)
dfs.namenode.replication.min: 1
CORRUPT FILES: 25829
MISSING BLOCKS: 25855
MISSING SIZE: 48788356419 B
CORRUPT BLOCKS: 25855
********************************
Minimally replicated blocks: 153695 (85.60011 %)
Over-replicated blocks: 0 (0.0 %)
Under-replicated blocks: 0 (0.0 %)
Mis-replicated blocks: 0 (0.0 %)
Default replication factor: 2
Average block replication: 1.8671457
Corrupt blocks: 25855
Missing replicas: 0 (0.0 %)
Number of data-nodes: 8
Number of racks: 1
FSCK ended at Thu Nov 09 18:46:08 UTC 2017 in 32553 milliseconds
FSCK ended at Thu Nov 09 18:46:08 UTC 2017 in 32554 milliseconds
fsck encountered internal errors!

Fsck on path '/' FAILED

Any reason why this error message would show up?