Failed to test with YCSB

[jiaweixiao]

Hi,

I tried to test QuickCached with YCSB but failed.

Testbed

OS: Ubuntu 18.04
JDK: 8 or 11
YCSB: 0.17.0 RC1 (https://github.com/brianfrankcooper/YCSB/tree/0.17.0-RC1)
QuickCached: the master branch
Memcached: 1.4.24 (https://memcached.org/downloads)

Commands

1. Start QuickCached (in QuickCached directory)
   java -server -Dappname=QC1 -Xms16g -Xmx16g -jar dist/QuickCached-Server.jar -l 127.0.0.1 -p 11211
2. Load workload (in YCSB directory)
   ./bin/ycsb load memcached -P workloads/workloada -p memcached.hosts=127.0.0.1:11211 -p recordcount=10000 -p operationcount=10000 -threads 8
3. Run workload
   ./bin/ycsb run memcached -P workloads/workloada -p memcached.hosts=127.0.0.1:11211 -p recordcount=10000 -p operationcount=10000 -threads 8 -s

Problems

1. When using multiple threads to run the workload, e.g. 8 threads, there seems to be a high probability of failing to shut down all the memcached clients, thus YCSB will run forever even if maxexecutiontime is configured. (Similar to Benchmarking Runs Forever [Question] brianfrankcooper/YCSB#618 (comment))
2. If YCSB successes to shut down all the memcached clients, there will be many ERRORs in UPDATE.

Here are two situations where there will be no problems:

1. Use Memcached server.
2. Use QuickCached and run YCSB with one thread.

Could you please help me to solve these problems?

Thanks,
Jiawei