Struct StreamFragmentGraph

pub struct StreamFragmentGraph {
    pub fragments: HashMap<u32, StreamFragment>,
    pub edges: Vec<StreamFragmentEdge>,
    pub dependent_table_ids: Vec<u32>,
    pub table_ids_cnt: u32,
    pub ctx: Option<StreamContext>,
    pub parallelism: Option<Parallelism>,
    pub max_parallelism: u32,
}

Representation of a graph of stream fragments. Generated by the fragmenter in the frontend, only used in DDL requests and never persisted.

For the persisted form, see TableFragments.

Fields

fragments: HashMap<u32, StreamFragment>

all the fragments in the graph.

edges: Vec<StreamFragmentEdge>

edges between fragments.

dependent_table_ids: Vec<u32>

table_ids_cnt: u32

ctx: Option<StreamContext>

parallelism: Option<Parallelism>

If none, default parallelism will be applied.

max_parallelism: u32

Specified max parallelism, i.e., expected vnode count for the graph.

The scheduler on the meta service will use this as a hint to decide the vnode count for each fragment.

Note that the actual vnode count may be different from this value. For example, a no-shuffle exchange between current fragment graph and an existing upstream fragment graph requires two fragments to be in the same distribution, thus the same vnode count.

Implementations

impl StreamFragmentGraph

pub fn get_fragments(&self) -> &HashMap<u32, StreamFragment>

pub fn get_edges(&self) -> &Vec<StreamFragmentEdge>

pub fn get_dependent_table_ids(&self) -> &Vec<u32>

pub fn get_table_ids_cnt(&self) -> u32

pub fn get_ctx(&self) -> Result<&StreamContext, PbFieldNotFound>

pub fn get_parallelism(&self) -> Result<&Parallelism, PbFieldNotFound>

pub fn get_max_parallelism(&self) -> u32

Trait Implementations

impl Clone for StreamFragmentGraph

fn clone(&self) -> StreamFragmentGraph

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for StreamFragmentGraph

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for StreamFragmentGraph

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for StreamFragmentGraph

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Message for StreamFragmentGraph

fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.

fn clear(&mut self)

Clears the message, resetting all fields to their default.

fn encode(&self, buf: &mut impl BufMut) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message to a buffer.

fn encode_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message to a newly allocated buffer.

fn encode_length_delimited( &self, buf: &mut impl BufMut, ) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message with a length-delimiter to a buffer.

fn encode_length_delimited_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message with a length-delimiter to a newly allocated buffer.

fn decode(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes a length-delimited instance of the message from the buffer.

fn merge(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes an instance of the message from a buffer, and merges it into self.

fn merge_length_delimited(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes a length-delimited instance of the message from buffer, and merges it into self.

impl PartialEq for StreamFragmentGraph

fn eq(&self, other: &StreamFragmentGraph) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for StreamFragmentGraph

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for StreamFragmentGraph