rlink 0.6.16

High performance Stream Processing Framework
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148

use std::collections::HashMap;

use crate::core::checkpoint::{Checkpoint, CheckpointHandle, FunctionSnapshotContext};
use crate::core::element::Element;
use crate::core::function::CoProcessFunction;
use crate::core::operator::DefaultStreamOperator;
use crate::core::runtime::{JobId, OperatorId};
use crate::runtime::worker::checkpoint::submit_checkpoint;
use crate::runtime::worker::runnable::{Runnable, RunnableContext};

pub(crate) struct CoProcessRunnable {
    operator_id: OperatorId,
    stream_co_process: DefaultStreamOperator<dyn CoProcessFunction>,
    next_runnable: Option<Box<dyn Runnable>>,

    context: Option<RunnableContext>,

    /// key: JobId,
    /// value: DataStream index  
    parent_jobs: HashMap<JobId, usize>,
}

impl CoProcessRunnable {
    pub fn new(
        operator_id: OperatorId,
        stream_co_process: DefaultStreamOperator<dyn CoProcessFunction>,
        next_runnable: Option<Box<dyn Runnable>>,
    ) -> Self {
        info!("Create FilterRunnable");

        CoProcessRunnable {
            operator_id,
            stream_co_process,
            next_runnable,
            context: None,
            parent_jobs: HashMap::new(),
        }
    }
}

impl Runnable for CoProcessRunnable {
    fn open(&mut self, context: &RunnableContext) -> anyhow::Result<()> {
        self.next_runnable.as_mut().unwrap().open(context)?;

        self.context = Some(context.clone());

        // find the stream_node of `input_format`
        // the chain: input_format -> connect, so the `connect` is only one parent
        let source_stream_node = &context.job_node().stream_nodes[0];

        for index in 0..source_stream_node.parent_ids.len() {
            let parent_id = source_stream_node.parent_ids[index];
            let parent_job_id = context
                .parent_jobs()
                .iter()
                .find_map(|(node, _)| {
                    node.stream_nodes
                        .iter()
                        .find(|x| x.id == parent_id)
                        .map(|_x| node.job_id)
                })
                .ok_or(anyhow!("co_process_function parent not found"))?;
            self.parent_jobs.insert(parent_job_id, index);
        }

        let fun_context = context.to_fun_context(self.operator_id);
        self.stream_co_process.operator_fn.open(&fun_context)?;

        Ok(())
    }

    fn run(&mut self, element: Element) {
        match element {
            Element::Record(record) => {
                let stream_seq = *self
                    .parent_jobs
                    .get(&record.channel_key.source_task_id.job_id)
                    .expect("parent job not found");

                let records = if stream_seq == self.parent_jobs.len() - 1 {
                    self.stream_co_process
                        .operator_fn
                        .as_mut()
                        .process_left(record)
                } else {
                    self.stream_co_process
                        .operator_fn
                        .as_mut()
                        .process_right(stream_seq, record)
                };

                for record in records {
                    self.next_runnable
                        .as_mut()
                        .unwrap()
                        .run(Element::Record(record));
                }
            }
            Element::Barrier(barrier) => {
                let checkpoint_id = barrier.checkpoint_id;
                let snapshot_context = {
                    let context = self.context.as_ref().unwrap();
                    context.checkpoint_context(self.operator_id, checkpoint_id, None)
                };
                self.checkpoint(snapshot_context);

                self.next_runnable
                    .as_mut()
                    .unwrap()
                    .run(Element::Barrier(barrier));
            }
            _ => {
                self.next_runnable.as_mut().unwrap().run(element);
            }
        }
    }

    fn close(&mut self) -> anyhow::Result<()> {
        self.stream_co_process.operator_fn.close()?;
        self.next_runnable.as_mut().unwrap().close()
    }

    fn set_next_runnable(&mut self, next_runnable: Option<Box<dyn Runnable>>) {
        self.next_runnable = next_runnable;
    }

    fn checkpoint(&mut self, snapshot_context: FunctionSnapshotContext) {
        let handle = self
            .stream_co_process
            .operator_fn
            .snapshot_state(&snapshot_context)
            .unwrap_or(CheckpointHandle::default());

        let ck = Checkpoint {
            operator_id: snapshot_context.operator_id,
            task_id: snapshot_context.task_id,
            checkpoint_id: snapshot_context.checkpoint_id,
            completed_checkpoint_id: snapshot_context.completed_checkpoint_id,
            handle,
        };
        submit_checkpoint(ck).map(|ck| {
            error!(
                "{:?} submit checkpoint error. maybe report channel is full, checkpoint: {:?}",
                snapshot_context.operator_id, ck
            )
        });
    }
}