Thank you for reply.
I already have tried to run "nodetool stop compaction" and this does not help. I have restarted each node in cluster one by one and compaction starts again. It gets stuck on same table.
Following in 'nodetool compactionstats' output. It's stuck at 1336035468 for more than 35 hours at least.
pending tasks: 1
compaction type keyspace table completed total unit progress
Compactionnotification_system_v1user_notification 1336035468 1660997721 bytes 80.44%
Active compaction remaining time : 0h00m38s
Following is output for "nodetool cfstats".
SSTable count: 18
Space used (live), bytes: 17247516201
Space used (total), bytes: 17316488652
SSTable Compression Ratio: 0.41922805938461566
Number of keys (estimate): 32556160
Memtable cell count: 44717
Memtable data size, bytes: 27705294
Memtable switch count: 5
Local read count: 0
Local read latency: 0.000 ms
Local write count: 236961
Local write latency: 0.047 ms
Pending tasks: 0
Bloom filter false positives: 0
Bloom filter false ratio: 0.00000
Bloom filter space used, bytes: 72414688
Compacted partition minimum bytes: 104
Compacted partition maximum bytes: 4966933177
Compacted partition mean bytes: 1183
Average live cells per slice (last five minutes): 0.0
Average tombstones per slice (last five minutes): 0.0
Please let me know if any more information. I am really thankful to you for spending time on this investigation.
Thanks & Regards,