The repository can be complied using mvn clean package -DskipTests under the project root directory;
see also BUILDING.md.
For the Example 1 and 2, All the scripts for running the examples are located in the ratis-examples/src/main/bin directory; see below for the usage.
Example 3 does not contain any script to run it refer to Example 3 run section.
FileStore is a high performance file service supporting read, write and delete operations. The FileStoreStateMachine is implemented using the asynchronous event-driven model. The source code is located in
To spawn a FileStore server, run
server.sh filestore server --id <SELF_ID> --storage <STORAGE_DIR> --peers <ID:IP_ADDRESS,...>
where
<SELF_ID>, which must be in the peer list, is the ID of the instance being spawned,<STORAGE_DIR>is a local directory for storing Raft log and other data, and<ID:IP_ADDRESS,...>, which is a comma separated list of ID and IP address pairs, specifies the list of server peers.
Note that when multiple servers running at the same host, they must use different <STORAGE_DIR>.
For example,
BIN=ratis-examples/src/main/bin
PEERS=n0:127.0.0.1:6000,n1:127.0.0.1:6001,n2:127.0.0.1:6002
ID=n0; ${BIN}/server.sh filestore server --id ${ID} --storage /tmp/ratis/${ID} --peers ${PEERS}
ID=n1; ${BIN}/server.sh filestore server --id ${ID} --storage /tmp/ratis/${ID} --peers ${PEERS}
ID=n2; ${BIN}/server.sh filestore server --id ${ID} --storage /tmp/ratis/${ID} --peers ${PEERS}
To spawn a FileStore load generation client, run
client.sh filestore loadgen --size <FILE_SIZE> --numFiles <NUM_FILES> --peers <ID:IP_ADDRESS,...>
where
<FILE_SIZE>is the size of the files to be generated in bytes, and<NUM_FILES>is the number of files to be generated.
Continue the server command example,
${BIN}/client.sh filestore loadgen --size 1048576 --numFiles 1000 --storage /tmp/ratis/loadgen --peers ${PEERS}
Arithmetic is an implementation of a replicated state machine. A variable map is stored in the ArithmeticStateMachine which supports assign and get operations. Clients may assign a variable to a value by specifying either the value or a formula to compute the value.
In TestArithemetic, it uses Arithmetic to solve Pythagorean equation and compute π using Gauss–Legendre algorithm.
The source code is located in
To spawn an Arithmetic server, run
server.sh arithmetic server --id <SELF_ID> --storage <STORAGE_DIR> --peers <ID:IP_ADDRESS,...>
where
<SELF_ID>, which must be in the peer list, is the ID of the instance being spawned,<STORAGE_DIR>is a local directory for storing Raft log and other data, and<ID:IP_ADDRESS,...>, which is a comma separated list of ID and IP address pairs, specifies the list of server peers.
Note that when multiple servers running at the same host, they must use different <STORAGE_DIR>.
For example,
BIN=ratis-examples/src/main/bin
PEERS=n0:127.0.0.1:6000,n1:127.0.0.1:6001,n2:127.0.0.1:6002
ID=n0; ${BIN}/server.sh arithmetic server --id ${ID} --storage /tmp/ratis/${ID} --peers ${PEERS}
ID=n1; ${BIN}/server.sh arithmetic server --id ${ID} --storage /tmp/ratis/${ID} --peers ${PEERS}
ID=n2; ${BIN}/server.sh arithmetic server --id ${ID} --storage /tmp/ratis/${ID} --peers ${PEERS}
To run an Arithmetic client command, run
client.sh arithmetic get --name <VAR> --peers <ID:IP_ADDRESS,...>
or
client.sh arithmetic assign --name <VAR> --value <VALUE> --peers <ID:IP_ADDRESS,...>
where
<VAR>is the name of a variable, and<VALUE>is the value (or a formula to compute the value) to be assigned.
Continue the server command example,
${BIN}/client.sh arithmetic assign --name a --value 3 --peers ${PEERS}
${BIN}/client.sh arithmetic assign --name b --value 4 --peers ${PEERS}
${BIN}/client.sh arithmetic assign --name c --value a+b --peers ${PEERS}
${BIN}/client.sh arithmetic get --name c --peers ${PEERS}
This example designed to be the simplest possible example and because of that
this example does not follow the scripts and command line parameters of previous
examples.
The Goal of this example is to maintain and replicate a counter value across
a cluster.
CounterServer class contains the main method to run the server and you can run it
three times with three different parameters(1,2 and 3).
all address and ports of the peers hardcoded in CounterCommon, so you don't
need any extra configuration to run this example on your localhost.
CounterClient class contains the main method to run the client,the client sends
several INCREMENT command and after that, it sends a GET command and prints the
result which should be the value of the counter.
'Counter State Machine' implemented in CounterStateMachine class.
You can find more detail by reading these classes javaDocs.
run the client and servers by these commands from ratis-examples directory:
for server: java -cp target/*.jar org.apache.ratis.examples.counter.server.CounterServer {serverIndex}
replace {serverIndex} with 1, 2, or 3
for client: java -cp target/*.jar org.apache.ratis.examples.counter.client.CounterClient
Note: This option is only available to Example 1 and 2
One can see the interactions of a three server Ratis cluster with a load-generator running against it
by using the run_all_tests.sh script found in dev-support/vagrant/.
See the dev-support/vagrant/README.md for more on dependencies and what is setup.
This will allow one to try a fully setup three server Ratis cluster on a single VM image,
preventing resource contention with your development host and allowing failure injection too.