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YCSB Memcached binding

This section describes how to run YCSB on memcached.

1. Install and start memcached service on the host(s)

Debian / Ubuntu:

sudo apt-get install memcached

RedHat / CentOS:

sudo yum install memcached

2. Install Java and Maven

See step 2 in [../mongodb/README.md](../mongodb/README.md).

3. Set up YCSB

Git clone YCSB and compile:

git clone http://github.com/brianfrankcooper/YCSB.git
cd YCSB
mvn -pl com.yahoo.ycsb:memcached-binding -am clean package

4. Load data and run tests

Load the data:

./bin/ycsb load memcached -s -P workloads/workloada > outputLoad.txt

Run the workload test:

./bin/ycsb run memcached -s -P workloads/workloada > outputRun.txt

5. memcached Connection Parameters

A sample configuration is provided in [conf/memcached.properties](conf/memcached.properties).

Required params

• memcached.hosts
  
  This is a comma-separated list of hosts providing the memcached interface. You can use IPs or hostnames. The port is optional and defaults to the memcached standard port of 11211 if not specified.

Optional params

• memcached.shutdownTimeoutMillis
  
  Shutdown timeout in milliseconds.

• memcached.objectExpirationTime
  
  Object expiration time for memcached; defaults to Integer.MAX_VALUE.

• memcached.checkOperationStatus
  
  Whether to verify the success of each operation; defaults to true.

• memcached.readBufferSize
  
  Read buffer size, in bytes.

• memcached.opTimeoutMillis
  
  Operation timeout, in milliseconds.

• memcached.failureMode
  
  What to do with failures; this is one of net.spy.memcached.FailureMode enum values, which are currently: Redistribute, Retry, or Cancel.

You can set properties on the command line via -p, e.g.:

./bin/ycsb load memcached -s -P workloads/workloada \
    -p "memcached.hosts=127.0.0.1" > outputLoad.txt