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,
    pub backfill_order: Option<BackfillOrder>,
}

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.

backfill_order: Option<BackfillOrder>

The backfill order strategy for the fragments.

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

pub fn get_backfill_order(&self) -> Result<&BackfillOrder, PbFieldNotFound>

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