Operation class is used in un-threadsafe, unsynchronized manner. about spymemcached HOT 4 CLOSED

Again, thanks for the patch.  This may explain an issue we've been 
investigating recently

Added to couchbase Gerrit as http://review.couchbase.org/9402

This has been merged into the 2.7.2 and 2.8 branch. Attached is a 2.7.2 jar 
with the fix.

Hello!

I am also running into this issue, specifically getting the assertion error "No 
output buffer" thrown by BaseOperationImpl.java:79. The error occurs whenever 
memcached is losing a connection and attempts to reconnect 
(MemcachedConnection.queueReconnect). However, I am only experiencing this the 
moment I enabled the binary communication mode. 

I looked into the patch above which seems to tackle this problem, but also 
wraps literally every method of the Operation object with synchronized locks, 
and I am a bit skeptical about the impact on performance.

Do you have any further information on this issue, especially why it 
exclusively happens with binary connections, while ASCII mode works fine?

Thanks!

Sebastian