[runtime env] URI reference refactor #22828

SongGuyang · 2022-03-04T17:44:26Z

Why are these changes needed?

Move the URI reference logic from raylet to agent.
Redefine the runtime env agent RPC to CreateRuntimeEnvOrGet and DeleteRuntimeEnvIfPossible
More details [Feature][runtime env] URI reference refactor #21695 (comment)

Future works

We don't remove the RuntimeEnvUris from RuntimeEnv protobuf in current PR because gcs also uses those URIs to do GC by runtime_env_manager. We should also clear this.
Ray client server shouldn't interact with agent directly. Or Ray client server should also decrease the reference count.
Currently, WorkerPool::HandleJobStarted will be called multiple times for one job. So we should make sure this function is idempotent. Can we change this logic and make this function be called only once?

Related issue number

#21695

Checks

I've run scripts/format.sh to lint the changes in this PR.
I've included any doc changes needed for https://docs.ray.io/en/master/.
I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
Testing Strategy
- Unit tests
- Release tests
- This PR is not tested :(

SongGuyang · 2022-03-04T18:03:03Z

@edoakes @architkulkarni @rkooo567 This PR is not completed yet. But I have one question needed to discuss first. I saw that we also create runtime env in client server, but it doesn't delete the URI by RPC. Do we will keep this logic in future? Maybe there will be some corner cases which bring URI leakage(for example, client-server dies before the client job started) . I'm not sure the real effect.
Another thought, can we setup the environment of client-server by the way like job submission? If we can start client-server in an actor, we can avoid proxier communicating with agent.

rkooo567 · 2022-03-04T22:29:23Z

I believe that code path is a hack and we should remove it!

SongGuyang · 2022-03-08T13:21:23Z

@architkulkarni @edoakes @rkooo567 This PR is ready to review! I have updated some issues in the Future works part of the description. I'd like to discuss about this.

architkulkarni

Looks great! Just some minor comments and questions.

Regarding the HandleJobStarted future work item in the PR description, I don't know if it's possible to make it only be called once per job -- @wuisawesome maybe you have some thoughts about this?
I'm not too familiar with the logic of num_registered_workers and num_starting_workers so it's hard for me to review that part carefully. @SongGuyang maybe you could summarize the change, or someone else could review that part?
It seems like the worker pool is now calling AddURIReference, which creates the runtime env as a side effect. The name might be a little confusing. Shouldn't these methods be called CreateRuntimeEnvIfNeeded and DeleteRuntimeEnvIfNeeded, and internally the agent adjusts the refcounts if needed? I don't feel strongly about this though, I'm fine with leaving it.

architkulkarni · 2022-03-09T00:05:32Z

dashboard/modules/runtime_env/runtime_env_agent.py

+        return unused_uris
+
+    # Don't change URI reference for `client_server` because `client_server` doesn't
+    # send the `DecreaseRuntimeEnvReference` RPC when the client exits.


Makes sense, thanks for catching this! I think the only downside of this for the user is that when they connect with ray.init() with Ray Client, it will install the runtime environment, and then when the user runs their first task it will install the exact same runtime environment again, which could be slow.

I think the downside is not too severe.

architkulkarni · 2022-03-09T00:07:58Z

dashboard/modules/runtime_env/runtime_env_agent.py

        async def _setup_runtime_env(
-            serialized_runtime_env, serialized_allocated_resource_instances
+            runtime_env, serialized_runtime_env, serialized_allocated_resource_instances


Seems slightly odd to have both serialized_runtime_env and runtime_env args; do we need both?

I add runtime_env here because I don't want to deserialize twice. Just an optimization for performance.

architkulkarni · 2022-03-09T00:47:29Z

python/ray/util/client/server/proxier.py

                if r.status == agent_manager_pb2.AgentRpcStatus.AGENT_RPC_STATUS_OK:
+                    # specific_server.set_serialized_runtime_env(serialized_runtime_env)


Should we remove this comment?

architkulkarni · 2022-03-09T00:55:43Z

src/ray/raylet/worker_pool.cc

-    // Kill all the workers that have been started but not registered.
-    for (const auto &starting_worker : entry.second.starting_worker_processes) {
-      procs_to_kill.insert(starting_worker.second.proc);
+    // Kill all the worker processes.


Should we leave the NOTE in, or does it no longer apply?

I think it applies. Here we kill all the worker processes when the worker pool is deconstructed. I didn't modify this logic. But I have redefine starting_worker_processes to worker_processes which means that we will store the alive processes all the way. So we can kill all the processes by this.

architkulkarni · 2022-03-09T01:03:26Z

src/ray/raylet/worker_pool.cc

@@ -596,28 +579,35 @@ void WorkerPool::MarkPortAsFree(int port) {
  }
 }

+static bool RuntimeEnvNotEmpty(const std::string &serialized_runtime_env) {


We currently have IsRuntimeEnvEmpty() in runtime_env_common.h, does it make sense to use that one?

Good! I will reuse yours.

architkulkarni · 2022-03-09T01:16:56Z

src/ray/raylet/worker_pool.cc

@@ -746,7 +734,7 @@ Status WorkerPool::RegisterDriver(const std::shared_ptr<WorkerInterface> &driver
  auto &state = GetStateForLanguage(driver->GetLanguage());
  state.registered_drivers.insert(std::move(driver));
  const auto job_id = driver->GetAssignedJobId();
-  all_jobs_[job_id] = job_config;
+  HandleJobStarted(job_id, job_config);


I don't have much context here, do you know why HandleJobStarted wasn't called here previously? Was this a bug?

+1 to Archit's comment. Either way, can we get a unit test to ensure the ref counting behavior is correct and stays correct?

HandleJobStarted only do two things: First, add job to all_jobs_ . Second, install runtime env eagerly if needed.

Before current PR:
HandleJobStarted will be triggered by the publishing channel of job. So here, in RegisterDriver, it's ok to only add job to all_jobs_.

In current PR:
To guarantee the creating runtime env RPC only be called once, I have modified the logic of HandleJobStarted. HandleJobStarted will check if the job already been added. So, I should also use HandleJobStarted here to make sure the creating runtime env RPC could be called.

architkulkarni · 2022-03-09T01:23:55Z

src/ray/raylet/worker_pool.h

@@ -461,11 +461,13 @@ class WorkerPool : public WorkerPoolInterface, public IOWorkerPoolInterface {
  };

  /// Some basic information about the starting worker process.


Suggested change

/// Some basic information about the starting worker process.

/// Some basic information about the worker process.

architkulkarni · 2022-03-09T01:26:42Z

src/ray/raylet/worker_pool.h

-  ///       |                             |                        |
-  ///       +------------------------------------------------------+
-  ///
-  ///  Now, we can delete the runtime env resources safely.


Isn't there still value in keeping this? (Maybe moving it above the Increase/DecreaseURIReference methods)? It's true that the actual adding and deleting of the references is now happening in the agent, but the AddURIReference and DeleteURIReference calls are still coming from this file. So the information here is still accurate and useful, right?

Yeah, I can add a doc to Increase/DecreaseURIReference methods. But it will be more simple which is entire different from this.

Add the doc here https://github.com/ray-project/ray/pull/22828/files#diff-a88735bc6aa09dd8248a3e73081916b5096a79c4bb7de91f9875d2c5a84ef075R629

SongGuyang · 2022-03-09T03:25:37Z

@rkooo567 please help to review the part of worker_pool?

SongGuyang · 2022-03-09T03:35:31Z

It seems like the worker pool is now calling AddURIReference, which creates the runtime env as a side effect. The name might be a little confusing. Shouldn't these methods be called CreateRuntimeEnvIfNeeded and DeleteRuntimeEnvIfNeeded, and internally the agent adjusts the refcounts if needed? I don't feel strongly about this though, I'm fine with leaving it.

@edoakes @rkooo567 what do you think about the RPC name? CreateRuntimeEnvIfNeeded and DeleteRuntimeEnvIfNeeded seem also good for me, but there is no meaning of reference count. I'm a little entangled with the names. 😅

rkooo567 · 2022-03-09T04:34:50Z

I think it is okay not to expose ref count to worker pool, so “ifNeeded” sounds good to me?

rkooo567 · 2022-03-09T04:35:07Z

And I will review it today!

rkooo567

I had the initial pass! One of concerns I have is that gRPC requests are usually unordered afaik, and this could cause issues? (If Delete request comes before Create). Do you know if this is possible when the caller is always the same?

rkooo567 · 2022-03-09T15:58:01Z

dashboard/modules/runtime_env/runtime_env_agent.py

+        PIP = 3
+        CONDA = 4
+
+    def get_uris_from_runtime_env(self, runtime_env: RuntimeEnv):


Why don't we just put all of them to a single class? I think it could be

class URIReferenceTable: def add_uris(self, runtime_env): uris = self. get_uris_from_runtime_env(runtime_env) self. increase_reference_for_uris(uris)

?

We can also expose some gRPC endpoints to query ref count information in the future.

rkooo567 · 2022-03-09T15:59:56Z

dashboard/modules/runtime_env/runtime_env_agent.py

+        try:
+            serialized_env = request.serialized_runtime_env
+            runtime_env = RuntimeEnv.deserialize(serialized_env)
+            uris = self.get_uris_from_runtime_env(runtime_env)


Can you put these two lines out of the try/except? They seem to be unrelated to the except block (it basically says it fails to parse runtime env?)

uris = self.get_uris_from_runtime_env(runtime_env) if request.source_process not in self.reference_exclude_sources: self.increase_reference_for_uris(uris)

So something like

try: serialized_env = request.serialized_runtime_env runtime_env = RuntimeEnv.deserialize(serialized_env) except Exception as e: self._logger.exception( "[Increase] Failed to parse runtime env: " f"{serialized_env}" ) return runtime_env_agent_pb2.CreateRuntimeEnvIfNeededReply( status=agent_manager_pb2.AGENT_RPC_STATUS_FAILED, error_message="".join( traceback.format_exception(type(e), e, e.__traceback__) ), ) uris = self.get_uris_from_runtime_env(runtime_env) if request.source_process not in self.reference_exclude_sources: self.increase_reference_for_uris(uris)

rkooo567 · 2022-03-09T16:02:57Z

dashboard/modules/runtime_env/runtime_env_agent.py

@@ -243,7 +318,9 @@ def setup_plugins():
                        "Runtime env already failed. "
                        f"Env: {serialized_env}, err: {error_message}"
                    )
-                    return runtime_env_agent_pb2.CreateRuntimeEnvReply(
+                    if request.source_process not in self.reference_exclude_sources:
+                        self.decrease_reference_for_uris(uris)


The python code with try/except seems to make it difficult to make correct atomic ref counting. Why don't we refactor code in this way?

increase_ref_count(runtime_env) status = create_runtime_env(runtime_env) if status != success: decrease_ref_count(runtime_env) reply(status)

rkooo567 · 2022-03-09T16:03:17Z

dashboard/modules/runtime_env/runtime_env_agent.py

+
+        try:
+            runtime_env = RuntimeEnv.deserialize(request.serialized_runtime_env)
+            uris = self.get_uris_from_runtime_env(runtime_env)


Same comment as above?

rkooo567 · 2022-03-09T16:06:44Z

src/ray/raylet/worker_pool.cc

@@ -197,24 +186,19 @@ void WorkerPool::update_worker_startup_token_counter() {
  worker_startup_token_counter_ += 1;
 }

-void WorkerPool::AddStartingWorkerProcess(
+void WorkerPool::AddWorkerProcess(


What's the motivation for the name change?

Before current PR, we will delete the process when the worker finishes registration.
In current PR, I change this logic. The process will be stored all the way before the worker exits.

rkooo567 · 2022-03-09T16:09:37Z

src/ray/raylet/worker_pool.h

+  ///
+  /// `CreateRuntimeEnvIfNeeded` means increasing the reference count for the runtime env
+  /// and `DeleteRuntimeEnvIfNeeded` means decreasing the reference count. We increase or
+  /// decrease runtime env reference in the cases below:


Can you mention this happens from the agent now?

actual ref counting

rkooo567 · 2022-03-09T16:13:08Z

src/ray/raylet/worker_pool.cc

-    if (worker_state.starting_worker_processes.count(worker_startup_token) > 0) {
+    auto it = worker_state.worker_processes.find(worker_startup_token);
+    if (it != worker_state.worker_processes.end() &&
+        it->second.num_starting_workers != 0) {


Can num_starting_workers be negative?

I think it can't. But I also could change this code to it->second.num_starting_workers > 0.

rkooo567 · 2022-03-09T16:15:15Z

src/ray/raylet/worker_pool.cc

  auto &state = GetStateForLanguage(worker->GetLanguage());
+  auto it = state.worker_processes.find(worker->GetStartupToken());
+  if (it != state.worker_processes.end()) {
+    it->second.num_registered_workers--;


Is it impossible the worker disconnected was a "starting workers"?

It looks like this code could be problematic if that's the case

Good point. I think this could happen by low probability. I have deleted this field and add a field alive_started_workers to record the started workers.

rkooo567 · 2022-03-09T16:39:30Z

src/ray/raylet/worker_pool.cc

-        CreateRuntimeEnv(
+        RAY_LOG(DEBUG) << "[dedicated] Creating runtime env for task "
+                       << task_spec.TaskId();
+        CreateRuntimeEnvIfNeeded(


Actually, why don't we call it GetOrCreateRuntimeEnv?

rkooo567 · 2022-03-09T16:41:42Z

src/ray/raylet/worker_pool.cc

+  if (it != state.worker_processes.end()) {
+    it->second.num_registered_workers--;
+    if (it->second.num_registered_workers == 0 && it->second.num_starting_workers == 0) {
+      DeleteRuntimeEnvIfNeeded(it->second.runtime_env_info.serialized_runtime_env());


For this API, my impression is the right name is

DeleteRuntimeEnvIfPossible

or

MarkRuntimeEnvUnused

Wdyt?

CreateRuntimeEnvOrGet and DeleteRuntimeEnvIfPossible? I like symmetrical names. 😄

Hmm imo these two has a slightly different semantics to have symmetric names (create is get Or create , and delete it Delete or do nothing). But it is up to you.

SongGuyang · 2022-03-10T07:00:49Z

I had the initial pass! One of concerns I have is that gRPC requests are usually unordered afaik, and this could cause issues? (If Delete request comes before Create). Do you know if this is possible when the caller is always the same?

TCP can guarantee the order, I'm not sure if grpc local buffer will break this(I guess it won't). But I think there is no consistency issue even though the Delete request comes before Create. If the Delete request comes first, agent will mark the runtime env unused and put it into the cache. When Create request comes, if the cache is not evicted, the runtime env will be marked used. Otherwise, agent will setup the runtime env again. If will bring extra workload, but not serious.

SongGuyang · 2022-03-17T04:55:41Z

@rkooo567 Take a look again? We will merge today if no new comments.

rkooo567 · 2022-03-17T13:32:04Z

dashboard/modules/runtime_env/runtime_env_agent.py

+
+    def __init__(
+        self,
+        uris_parser: Callable[[RuntimeEnv], None],


Hmm this makes me think all logic here should be just within RuntimeEnvAgent class. Having a separate class like this requires you to pass callbacks, which are weird.

Can you just remove this class and make them a private method of RuntimeEnvAgent?

class RuntimeEnvAgent: def _increase_ref_count(): def _decrease_ref_count():

rkooo567 · 2022-03-17T13:32:30Z

dashboard/modules/runtime_env/runtime_env_agent.py

+        self._unused_uris_callback = unused_uris_callback
+        self._unused_runtime_env_callback = unused_runtime_env_callback
+        # Don't change URI reference for `client_server` because `client_server` doesn't
+        # send the `DeleteRuntimeEnvIfPossible` RPC when the client exits.


Can you also comment that here? Othewise, this part will be very confusing when somebody looks at it

rkooo567 · 2022-03-17T13:36:36Z

dashboard/modules/runtime_env/runtime_env_agent.py

@@ -216,7 +343,67 @@ def setup_plugins():

            return context

-        serialized_env = request.serialized_runtime_env
+        # Create runtime env with retry times. This function won't raise exceptions.
+        # Returns a tuple which contains result(bool), runtime env context(str), and


Can you follow the proper Python-style docstring (https://docs.ray.io/en/master/ray-contribute/getting-involved.html#code-style)? Also, consider adding type annotation t

async def _create_runtime_env_with_retry( runtime_env: RuntimeEnv, serialized_runtime_env: str, serialized_allocated_resource_instances: str ) -> Tuple[X, Y, Z]: """ Blah blah Args: Returns: """

rkooo567 · 2022-03-17T13:39:02Z

^ last 3 comments !

SongGuyang · 2022-03-17T13:50:44Z

@rkooo567 Do you remember that you comment here #22828 (comment) to ask me using a single class? I think the current class is clear and the callback is reasonable. If you insist, I will add a TODO here and change it in future PR.
btw, Only left one day for me to merge this PR. Can you approve first? I don't think the remaining comment issues are big.

rkooo567 · 2022-03-17T14:26:44Z

@rkooo567 Do you remember that you comment here #22828 (comment) to ask me using a single class?

Yeah, I remember that. However, when I made a suggestion, I didn't know this would require the callback arguments to modify the parent's states. I don't agree this is reasonable & clear because you don't have any unit test on this class (so there's not much meaning having this additional layer) & this sort of callback is generally harder to read and used to avoid poor class structure.

I really think we should avoid merging PRs just because we want to merge it before branch cut. This PR doesn't fix any existing user issues or critical bugs. There's no urgent features that have a hard dependency on it. I really don't understand why you rush on this. This is how we accumulate lots of tech debt to the codebase...

If you really believe the new class is more reasonable, then go ahead. But please at least address these two comments.

#22828 (comment)
#22828 (comment)

SongGuyang · 2022-03-17T15:02:44Z

I have pushed new commit here alipay@57f1bbc but current PR don't change.

rkooo567 · 2022-03-17T15:08:34Z

#22828 (comment) is this a bug? I heard from some people that Github has some outage now https://www.githubstatus.com/

SongGuyang · 2022-03-17T15:13:04Z

Oh, no😭

rkooo567 · 2022-03-17T15:28:55Z

If it takes time to resolve it, I can probably just merge it and you can create a follow up PR for the fix

SongGuyang · 2022-03-17T15:29:02Z

@rkooo567 I really appreciate for your careful review. This help me a lot to enhance my code. Respect for your pay out. But I don't think I'm producing tech debt. I also try to address or feed back all the comments carefully, right? If my PR don't meet the requirement of merging, no problem, I will improve.

About the class, I think the benefit is that it could make the responsibility clearly. ReferenceTable only maintains the reference count and RuntimeEnvAgent handles others. If you think I lost the unit test, I'm ok to add.

SongGuyang · 2022-03-17T15:34:27Z

If it takes time to resolve it, I can probably just merge it and you can create a follow up PR for the fix

Not so urgent. I will wait github recovered tomorrow. I believe it will not invalid more than one day. 😁

…runtime_env_uri

SongGuyang · 2022-03-18T04:59:11Z

Add a reference table test b80289e.

rkooo567

Looks like it has conflicts?

Conflicts: dashboard/modules/runtime_env/runtime_env_agent.py python/ray/tests/test_runtime_env_2.py python/ray/util/client/server/proxier.py src/ray/protobuf/runtime_env_agent.proto src/ray/raylet/agent_manager.cc src/ray/raylet/worker_pool.cc

SongGuyang · 2022-03-18T18:52:33Z

Looks like it has conflicts?

Yep, I merged master just now. Let's merge this if no tests broken.

architkulkarni · 2022-03-18T21:38:14Z

serve:test_cli flaky on master, Mac tests stalled

SongGuyang · 2022-03-18T23:03:20Z

@rkooo567 Is time to merge?

first commit

26b5cb6

SongGuyang requested review from raulchen, edoakes and architkulkarni as code owners March 4, 2022 17:44

SongGuyang requested a review from rkooo567 March 4, 2022 17:45

fix

a993bbc

rkooo567 assigned architkulkarni and rkooo567 Mar 7, 2022

rkooo567 added the @author-action-required The PR author is responsible for the next step. Remove tag to send back to the reviewer. label Mar 7, 2022

architkulkarni assigned edoakes Mar 7, 2022

SongGuyang added 3 commits March 8, 2022 19:19

fix worker_pool_test

b371c94

fix lint

3b4a643

add comments

d8fee9e

SongGuyang changed the title ~~[WIP][runtime env] URI reference refactor~~ [runtime env] URI reference refactor Mar 8, 2022

SongGuyang removed the @author-action-required The PR author is responsible for the next step. Remove tag to send back to the reviewer. label Mar 8, 2022

architkulkarni reviewed Mar 9, 2022

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SongGuyang added 2 commits March 9, 2022 21:15

address comments

6bebef6

fix

2860a37

rkooo567 reviewed Mar 9, 2022

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rkooo567 added the @author-action-required The PR author is responsible for the next step. Remove tag to send back to the reviewer. label Mar 10, 2022

SongGuyang added 2 commits March 11, 2022 16:01

Merge branch 'master' into dev_runtime_env_uri

65fd246

Merge branch 'master' into dev_runtime_env_uri

86a2700

format

44737bc

SongGuyang added 2 commits March 17, 2022 13:26

fix

c95316f

fix

7dfbb2c

rkooo567 reviewed Mar 17, 2022

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Merge branch 'master' into dev_runtime_env_uri

fb967dc

rkooo567 approved these changes Mar 17, 2022

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address comments

57f1bbc

SongGuyang added 2 commits March 18, 2022 10:16

Merge branch 'dev_runtime_env_uri' of github.com:alipay/ray into dev_…

def6c8a

…runtime_env_uri

add test_reference_table

b80289e

SongGuyang removed the @author-action-required The PR author is responsible for the next step. Remove tag to send back to the reviewer. label Mar 18, 2022

rkooo567 approved these changes Mar 18, 2022

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architkulkarni added the tests-ok The tagger certifies test failures are unrelated and assumes personal liability. label Mar 18, 2022

edoakes merged commit 69af976 into ray-project:master Mar 21, 2022

SongGuyang mentioned this pull request May 6, 2022

[runtime env] runtime env inheritance refactor #24538

Merged

		if r.status == agent_manager_pb2.AgentRpcStatus.AGENT_RPC_STATUS_OK:
		# specific_server.set_serialized_runtime_env(serialized_runtime_env)

		@@ -461,11 +461,13 @@ class WorkerPool : public WorkerPoolInterface, public IOWorkerPoolInterface {
		};

		/// Some basic information about the starting worker process.

	/// Some basic information about the starting worker process.
	/// Some basic information about the worker process.

[runtime env] URI reference refactor #22828

[runtime env] URI reference refactor #22828

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SongGuyang commented Mar 4, 2022 • edited Loading

Why are these changes needed?

Related issue number

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