There's a problem in exceptional cases wherein an incr can get stuck. This may be demonstrated by the following code:

public static void main(String[] args) throws Exception {

MemcachedClient cache = new

MemcachedClient(AddrUtil.getAddresses("localhost:11211"));

for (int i=0; i < 1000; i++) {
    cache.incr("test", 1, 1);
    Thread.sleep(100);
}

cache.shutdown();

}

Comment deleted

The fix for http://code.google.com/p/spymemcached/issues/detail?id=11 probably took care of this.

Oh, good point. Thanks. :)