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Write you an in-process gRPC service mesh.

License: Apache License 2.0

Rust 100.00%

grpc membership service-mesh service-discovery paxos async

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hellertime isgasho fridgeseal

blip's Issues

Document the remaining protocol handlers

In https://github.com/nytopop/blip/blob/master/src/cluster/mod.rs

Document and enforce l/h/k invariants

See https://arxiv.org/pdf/1803.03620.pdf#subsection.4.2

Consensus bug on partitions

This assertion fails, which means nodes don't always converge to the same configuration:

test three_node_cluster_partition_recovery ... FAILED

failures:

---- three_node_cluster_partition_recovery stdout ----
thread 'three_node_cluster_partition_recovery' panicked at 'assertion failed: c2.conf_id() == c3.conf_id()', tests/join_protocol.rs:146:13
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    three_node_cluster_partition_recovery

Dropping a Mesh future causes panics in h2

Pops up a lot in tests. Leaving this issue here so I don't forget about it.

This is probably the same as hyperium/h2/issues/417. From my (very) limited exploration into the cause, it seems like drop_stream_ref doesn't actually remove the slab entry, although there's enough indirection present that I'm fairly unsure of that being the case.

thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13
thread 'tokio-runtime-worker' panicked at 'assertion failed: self.slab.is_empty()', /home/eric/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.2.2/src/proto/streams/store.rs:212:13

Log protocol events

Abstract over cluster setup in integration tests

Currently, the integration tests use fixed size (~small) clusters because of the amount of boilerplate involved in test setup.

Instead, each tested property should be demonstrated to hold at a number of different cluster sizes. To do this correctly there needs to be a way to spin up an arbitrary size cluster, and progress specific nodes individually.

Test metadata

Basically, ensure metadata is preserved across all nodes, especially if nodes rejoin with changed metadata.

Fault simulation

The simulation module doesn't actually provide any way to simulate faults yet, which severely limits its utility.

Not sure if it's worth continuing the implementation, as https://github.com/tokio-rs/simulation is still in development and should be better integrated w/ the tokio runtime.

Make various consts configurable

blip/src/cluster/mod.rs

Line 527 in e8c6420

const TIMEOUT: Duration = Duration::from_secs(1);
blip/src/cluster/mod.rs

Line 528 in e8c6420

const STRIKES: usize = 3;
blip/src/cluster/partition.rs

Line 135 in e8c6420

const JOIN_TIMEOUT: Duration = Duration::from_secs(5);

Make it work on stable

CI

^^ title

Move away from failure

It's deprecated

Document the remaining proto definitions

In https://github.com/nytopop/blip/blob/master/proto/blip.proto

Improve crate/module level docs

Provide a connection pool

As it stands, services need to manage peer connections manually (and can't share them with each other), which introduces extra latency / overhead.

Instead, there should be a pool of connections in MultiNodeCut that all services have access to.

This will probably involve implementing some kind of lazy connection type, as one isn't provided natively by tonic.

Related: hyperium/tonic#167

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