You are likely running out of memory in the REDUCE phase. Can you take the heap profile, block profile and the htop output maybe every 30 sec?
Another similar thread, Fatal error: runtime: out of memory when bulk loader
You are likely running out of memory in the REDUCE phase. Can you take the heap profile, block profile and the htop output maybe every 30 sec?
Another similar thread, Fatal error: runtime: out of memory when bulk loader