On one of our server, compaction process is hanging. It's stuck at 80%. It
was stuck for last 3 days. And today we did a cluster restart (one host at
time). And again it is stuck at same 80%. CPU usages are 100% and there
seems no IO issue. We are seeing following kinds of WARNING in system.log

*BatchStatement.java (line 226) Batch of prepared statements for [****,
*****] is of size 7557, exceeding specified threshold of 5120 by 2437.*

Other than this there seems no error.  I have tried to stop compaction
process, but it does not stop. Cassandra version is 2.1.

 Can someone please guide us in solving this issue?

Thanks & Regards,
Atul Atri.

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