memcached closes the connection on source with error "killing myself due to unexpected upstream sender exit with reason: {{badmatch, {error, closed}}"

Larger cluster test on build 1.8.1-865
Create 10 nodes cluster in ec2 with 7.5 GB RAM and 100 GB disk on each node
Load 40 millions to cluster with item size from 256 bytes to 512 bytes
Mutate these items with size from 70 bytes to 256 bytes
Maintain the load on this cluster at 10K ops
Add a node and rebalance.
Few hours after rebalance done, add another load with 500000 items with size 25,50,70,128 bytes then add 2 other nodes at the same time and rebalance.
After rebalance done, see error in log page

killing myself due to unexpected upstream sender exit with reason: {{badmatch,
{error,
closed}},
[

]}