#stream-processing #hdfs #stream #flink #window

rlink-connector-files

High performance Stream Processing Framework

3 releases (breaking)

0.5.0 May 7, 2021
0.4.0 May 5, 2021
0.3.0 Apr 6, 2021

#960 in GUI

MIT/Apache

620KB
16K SLoC

rlink-rs

Crates.io Released API docs MIT licensed License

High performance Stream Processing Framework. A new, faster, implementation of Apache Flink from scratch in Rust. pure memory, zero copy. single cluster in the production environment stable hundreds of millions per second window calculation.

Framework tested on Linux/MacOS/Windows, requires stable Rust.

Monitor

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Graph

Graph Evolution

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Example

rlink = "0.6"
SELECT
  HOP_START(timestamp, INTERVAL '20' SECOND, INTERVAL '60' SECOND),
  HOP_END(timestamp, INTERVAL '20' SECOND, INTERVAL '60' SECOND),
  name,
  SUM(value),
  MAX(value),
  MIN(value),
  COUNT(*),
FROM stream_table
GROUP BY HOP(timestamp, INTERVAL '20' SECOND, INTERVAL '60' SECOND), name
#[derive(Clone, Debug)]
pub struct SimpleStreamApp {}

impl StreamApp for SimpleStreamApp {
    fn prepare_properties(&self, properties: &mut Properties) {
        properties.set_application_name("rlink-simple");
    }

    fn build_stream(&self, _properties: &Properties, env: &mut StreamExecutionEnvironment) {
        env.register_source(vec_source(gen_records(), &model::FIELD_METADATA), 1)
            .assign_timestamps_and_watermarks(
                DefaultWatermarkStrategy::new()
                    .for_bounded_out_of_orderness(Duration::from_secs(1))
                    .wrap_time_periodic(Duration::from_secs(10), Duration::from_secs(20))
                    .for_schema_timestamp_assigner("timestamp"),
            )
            .key_by(SchemaKeySelector::new(vec!["name"]))
            .window(SlidingEventTimeWindows::new(
                Duration::from_secs(60),
                Duration::from_secs(20),
                None,
            ))
            .reduce(
                SchemaReduceFunction::new(vec![sum("value"), max("value"), min("value"), count()]),
                2,
            )
            .add_sink(print_sink());
    }
}

Build

Build source

# debug
cargo build --color=always --all --all-targets
# release
cargo build --release --color=always --all --all-targets

Standalone Deploy

Config

standalone.yaml


---
# all job manager's addresses, one or more
application_manager_address:
  - "http://0.0.0.0:8770"
  - "http://0.0.0.0:8770"

metadata_storage:
  type: Memory

# bind ip
task_manager_bind_ip: 0.0.0.0
task_manager_work_dir: /data/rlink/application

task_managers

TaskManager list

10.1.2.1
10.1.2.2
10.1.2.3
10.1.2.4

Launch

Coordinator

./start_job_manager.sh

Worker

./start_task_manager.sh

Submit Application

On Standalone

## submit an application

# create job
curl http://x.x.x.x:8770/job/application \
  -X POST \
  -F "file=@/path/to/execute_file" \
  -v

# run job
curl http://x.x.x.x:8770/job/application/application-1591174445599 \
  -X POST \
  -H "Content-Type:application/json" \
  -d '{"batch_args":[{"cluster_mode":"Standalone", "manager_type":"Coordinator","num_task_managers":"15"}]}' \
  -v

# kill job
curl http://x.x.x.x:8770/job/application/application-1591174445599/shutdown \
  -X POST \
  -H "Content-Type:application/json"

On Yarn

update manager jar to hdfs

upload rlink-yarn-manager-{version}-jar-with-dependencies.jar to hdfs

eg: upload to hdfs://nn/path/to/rlink-yarn-manager-{version}-jar-with-dependencies.jar

update dashboard to hdfs

upload rlink-dashboard.zip to hdfs

eg: upload to hdfs://nn/path/to/rlink-dashboard.zip

update application to hdfs

upload your application executable file to hdfs.

eg: upload rlink-showcase to hdfs://nn/path/to/rlink-showcase

submit yarn job

submit yarn job with rlink-yarn-client-{version}.jar

hadoop jar rlink-yarn-client-{version}.jar rlink.yarn.client.Client \
  --applicationName rlink-showcase \
  --worker_process_path hdfs://nn/path/to/rlink-showcase \
  --java_manager_path hdfs://nn/path/to/rlink-yarn-manager-{version}-jar-with-dependencies.jar \
  --yarn_manager_main_class rlink.yarn.manager.ResourceManagerCli \
  --dashboard_path hdfs://nn/path/to/rlink-dashboard.zip \
  --master_memory_mb 256 \
  --master_v_cores 1 \
  --memory_mb 256 \
  --v_cores 1 \
  --queue root.default \
  --cluster_mode YARN \
  --manager_type Coordinator \
  --num_task_managers 80 \
  --application_process_arg xxx

On Kubernetes

Preparation

  • Kubernetes
  • KubeConfig, configurable via ~/.kube/config. You can verify permissions by running kubectl auth can-i <list|create|edit|delete> pods

take a look at how to setup a Kubernetes cluster.

# start 
./target/release/rlink-kubernetes \
  name=my_first_rlink_application \
  image_path=name:tag \
  job_v_cores=1 \
  job_memory_mb=100 \
  task_v_cores=1 \
  task_memory_mb=100 \
  num_task_managers=1  \

# stop
kubectl delete deployment/my_first_rlink_application

Build image example-simple

sudo docker build -t xxx:xx -f ./docker/Dockerfile_example_simple .

Dependencies

~45–61MB
~1M SLoC