feat: introduce the interface of RemoteJobScheduler
#4181
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Files selected for processing (4)
- src/mito2/src/compaction.rs (16 hunks)
- src/mito2/src/engine.rs (3 hunks)
- src/mito2/src/error.rs (2 hunks)
- src/mito2/src/region/options.rs (4 hunks)
Files skipped from review as they are similar to previous changes (3)
- src/mito2/src/engine.rs
- src/mito2/src/error.rs
- src/mito2/src/region/options.rs
Additional comments not posted (7)
src/mito2/src/compaction.rs (7)
107-108: Approve the addition ofpluginsfield toCompactionSchedulerstruct.The addition of the
pluginsfield is consistent with the PR's goal to enable remote job scheduling via plugins. This field should facilitate the integration of different plugins needed for compaction tasks.
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118-127: Review the updated constructor ofCompactionScheduler.The constructor now properly initializes the
pluginsfield with the providedpluginsargument. This change is necessary for supporting the functionality described in the PR.
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133-161: Review the asynchronous transformation ofschedule_compaction.The method has been correctly converted to an asynchronous function, which is essential for handling remote compaction tasks that may involve I/O operations or other asynchronous activities. The implementation appears to handle different compaction statuses and schedules compaction requests appropriately.
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165-190: Review the updatedon_compaction_finishedmethod.The method has been updated to async and includes logic to handle the scenario where the next compaction task needs to be scheduled. This change aligns with the asynchronous nature of the operations involved and the need for continuous compaction scheduling.
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231-350: Review the comprehensive changes inschedule_compaction_request.This method now handles the decision-making between remote and local compaction based on the compaction options. The handling of remote job scheduling and the fallback mechanism to local compaction if remote scheduling fails are crucial for the system's robustness and flexibility.
352-359: Review theremove_region_on_failuremethod.The method correctly handles the scenario where a region needs to be removed due to a failure. This is an important part of maintaining system stability and ensuring that failed tasks do not linger in the system.
29-30: Validate the necessity of new imports.Ensure that the
Pluginsfromcommon_baseandinfofromcommon_telemetryare used appropriately in the file. This helps maintain clarity and avoid unnecessary dependencies.Verification successful
New imports are used appropriately.
The
Pluginsandinfoimports are utilized within the file, ensuring they are necessary and relevant.
Pluginsis used in the context of the compaction scheduler.infois used for logging purposes.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the usage of newly imported modules. # Test: Search for usage of `Plugins` and `info`. rg --type rust $'Plugins|info' src/mito2/src/compaction.rsLength of output: 273
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Outside diff range and nitpick comments (1)
src/mito2/src/compaction.rs (1)
Line range hint
107-118: Check the addition of thepluginsfield inCompactionScheduler.The addition of the
pluginsfield toCompactionScheduleris a significant architectural change. It integrates plugin management directly into the compaction process, potentially enhancing flexibility and functionality. Ensure that all plugin interactions are thread-safe and well-managed.
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- src/mito2/src/compaction.rs (16 hunks)
- src/mito2/src/schedule/remote_job_scheduler.rs (1 hunks)
Additional comments not posted (6)
src/mito2/src/schedule/remote_job_scheduler.rs (5)
30-35: Ensure correct async trait usage withasync_traitmacro.The
async_traitmacro is correctly applied to theRemoteJobSchedulertrait, allowing for asynchronous method definitions. This is crucial for non-blocking operations in the system.
46-58: Review theJobIdstruct implementation.The
JobIdstruct is simple and efficient, providing necessary functionality to work with job IDs asu64. Methodsas_u64andfrom_u64are correctly implemented.
60-74: Consider removing#[allow(dead_code)]if the enum is used.The
RemoteJobenum is marked with#[allow(dead_code)], which is typically used to suppress warnings for unused code. If this enum is actively used in the system, consider removing the attribute to enforce code cleanliness.- #[allow(dead_code)]
91-131: CheckDefaultNotifierimplementation for potential improvements.The
DefaultNotifierhandles the notification logic robustly, encapsulating it within a match statement to distinguish between compaction success and failure. However, consider enhancing the logging details for better traceability of errors and operations.
[REFACTOR_SUGGESTion]+ "Compaction job completed with status: {:?}", notify,
37-42: Validate theNotifiertrait definition.The
Notifiertrait is well-defined for asynchronous notifications. Ensure that the implementation of this trait in various components handles errors properly during notification delivery.#!/bin/bash # Description: Search for implementations of the `Notifier` trait to verify error handling. # Test: Search for the trait implementations. Expect: Proper error handling in all implementations. ast-grep --lang rust --pattern $'impl Notifier for $_ { $$$ }'src/mito2/src/compaction.rs (1)
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133-161: Review asynchronous compaction scheduling logic.The method
schedule_compactionhas been correctly updated to be asynchronous. This is essential for non-blocking I/O operations in compaction tasks. Ensure that the error handling and asynchronous logic are robust and that failures in scheduling do not lead to unhandled exceptions or resource leaks.#!/bin/bash # Description: Verify error handling in asynchronous compaction scheduling. # Test: Search for error handling in the async compaction scheduling method. Expect: Robust error handling. ast-grep --lang rust --pattern $'async fn schedule_compaction($$$) { $$$ }'
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Outside diff range and nitpick comments (1)
src/mito2/src/compaction.rs (1)
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107-127: Review plugin integration in CompactionScheduler.The integration of
PluginsintoCompactionScheduleris crucial for extensibility. Ensure that the plugin system is robustly tested and well-documented to prevent future issues.Would you like me to help draft the unit tests or documentation for this integration?
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Files selected for processing (3)
- src/mito2/src/compaction.rs (16 hunks)
- src/mito2/src/region/options.rs (5 hunks)
- src/mito2/src/schedule/remote_job_scheduler.rs (1 hunks)
Additional comments not posted (4)
src/mito2/src/schedule/remote_job_scheduler.rs (2)
30-35: Consider using more descriptive names for job and notifier parameters.The parameters
jobandnotifierin theschedulemethod could be more descriptive to enhance code readability and maintainability.- async fn schedule(&self, job: RemoteJob, notifier: Arc<dyn Notifier>) -> Result<JobId>; + async fn schedule(&self, remote_job: RemoteJob, job_notifier: Arc<dyn Notifier>) -> Result<JobId>;
46-57: Simplify JobId struct with newtype pattern.The
JobIdstruct is currently a tuple struct. Consider using the newtype pattern for better type safety and encapsulation.- pub struct JobId(u64); + pub struct JobId(pub u64);Likely invalid or redundant comment.
src/mito2/src/region/options.rs (2)
148-150: Clarify serialization details for remote_compaction field.The
remote_compactionfield usesserde_asfor serialization. Ensure the serialization format is clearly documented and understood, especially if it deviates from typical boolean serialization.
121-125: Ensure consistency in remote compaction feature check.The method
remote_compactionchecks if remote compaction is enabled. Ensure that this setting is consistently used wherever relevant throughout the codebase.
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Outside diff range and nitpick comments (1)
src/mito2/src/schedule/remote_job_scheduler.rs (1)
44-49: Validate the usage ofRemoteJobenum.The
RemoteJobenum currently only has one variant,CompactionJob. Consider future scalability by potentially adding more job types or providing a more generic mechanism for job handling to accommodate different types of remote tasks beyond compaction.
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Files selected for processing (2)
- src/mito2/src/compaction.rs (16 hunks)
- src/mito2/src/schedule/remote_job_scheduler.rs (1 hunks)
Files not reviewed due to errors (1)
- src/mito2/src/compaction.rs (no review received)
Additional comments not posted (1)
src/mito2/src/schedule/remote_job_scheduler.rs (1)
51-58: Review the fields ofCompactionJobfor potential optimization.The
CompactionJobstruct includescompaction_region,picker_output, andstart_time. Ensure these fields are necessary and optimally used. For instance,start_timemight be redundant if timestamps are handled elsewhere in the job lifecycle.
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Files selected for processing (2)
- src/mito2/src/compaction.rs (16 hunks)
- src/mito2/src/error.rs (2 hunks)
Additional comments not posted (3)
src/mito2/src/error.rs (1)
758-763: Well-integrated new error type for remote job scheduler issues.The
RemoteJobSchedulererror type is well-defined, with appropriate use of theLocationtype for context and a clear display message. It's correctly integrated into theErrorExtimplementation to return anInternalstatus code, which is suitable for server-side issues.src/mito2/src/compaction.rs (2)
108-109: Proper integration of plugins for remote job scheduling.The addition of the
pluginsfield inCompactionScheduleris well-implemented. It is properly initialized in the constructor and is crucial for enabling the integration of remote job scheduling. This change supports the extensibility and modularity of the compaction scheduling system.Also applies to: 119-128
286-327: Robust handling of remote compaction scheduling with appropriate fallback.The implementation robustly handles the possibility of remote compaction by checking for the availability of a remote job scheduler and scheduling a remote job accordingly. It appropriately falls back to local compaction if remote scheduling is not possible, ensuring that compaction tasks are reliably handled.
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Files selected for processing (3)
- src/mito2/src/compaction.rs (15 hunks)
- src/mito2/src/error.rs (2 hunks)
- src/mito2/src/schedule/remote_job_scheduler.rs (1 hunks)
Files skipped from review as they are similar to previous changes (1)
- src/mito2/src/error.rs
Additional comments not posted (6)
src/mito2/src/schedule/remote_job_scheduler.rs (3)
32-37: Consider enhancing the documentation forRemoteJobScheduler.The trait
RemoteJobScheduleris crucial as it defines the API for scheduling remote jobs. However, it lacks comprehensive documentation that explains its purpose, usage, and the parameters of its methods. This is especially important for asynchronous methods in a distributed system context.
39-44: Ensure proper error handling in theNotifiertrait.The
notifymethod currently does not return aResult, which might imply that all errors are handled internally. However, it's crucial to allow error propagation to the caller to handle them appropriately, especially in a distributed environment where network issues and other errors are common.
77-119: Refactor error handling inDefaultNotifier.notify.The error handling in the
notifymethod should be improved to provide better visibility and handle errors more gracefully. The current implementation logs the error but does not propagate it, which might lead to silent failures in the system.- error!( - "Failed to notify compaction job status for region {}, request: {:?}", - result.region_id, e.0 - ); + error!("Failed to notify compaction job status for region {}, error: {:?}", result.region_id, e);src/mito2/src/compaction.rs (3)
108-109: Review the integration of plugins withinCompactionScheduler.The addition of
pluginstoCompactionScheduleris a significant change. Ensure that the integration is seamless and that the plugins are being utilized correctly, particularly in the context of remote compaction.+ /// Plugins for the compaction scheduler. + plugins: Plugins,Also applies to: 119-119, 128-128
286-317: Assess the fallback mechanism for remote compaction.The logic to fallback to local compaction if remote scheduling fails is crucial for reliability. Review the implementation to ensure that the fallback mechanism is seamless and does not introduce delays or inconsistencies in the compaction process. Consider adding more detailed logging at each step of the fallback to improve observability.
+ debug!("Fallback initiated for region {}", region_id);
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134-162: Evaluate the asynchronous compaction scheduling logic.The changes to make
schedule_compactionand related functions asynchronous are significant. It's crucial to ensure that these changes do not introduce any race conditions or logic errors, especially given the complexity of handling compaction tasks asynchronously.+ pub(crate) async fn schedule_compaction( + &mut self, + region_id: RegionId, + compact_options: compact_request::Options, + version_control: &VersionControlRef, + access_layer: &AccessLayerRef, + waiter: OptionOutputTx, + manifest_ctx: &ManifestContextRef, + ) -> Result<()>Also applies to: 166-191, 232-347
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- src/mito2/src/schedule/remote_job_scheduler.rs (1 hunks)
Additional comments not posted (2)
src/mito2/src/schedule/remote_job_scheduler.rs (2)
63-68: Confirm the usage and future plans forRemoteJobenum.The
#[allow(dead_code)]attribute suggests that not all variants are currently used. It's important to confirm if this is for future extensibility or if there's unnecessary code that could be cleaned up.
70-77:CompactionJobstruct is well-defined.The fields are appropriately chosen to represent a compaction job, and the use of
Instantforstart_timeis suitable for performance tracking.
| /// RemoteJobScheduler is a trait that defines the API to schedule remote jobs. | ||
| /// For example, a compaction job can be scheduled remotely as the following workflow: | ||
| /// ```mermaid | ||
| /// participant User | ||
| /// participant MitoEngine | ||
| /// participant CompactionScheduler | ||
| /// participant Plugins | ||
| /// participant RemoteJobScheduler | ||
| /// | ||
| /// User->>MitoEngine: Initiates compaction | ||
| /// MitoEngine->>CompactionScheduler: schedule_compaction() | ||
| /// CompactionScheduler->>Plugins: Handle plugins | ||
| /// CompactionScheduler->>RemoteJobScheduler: schedule(CompactionJob) | ||
| /// RemoteJobScheduler-->>CompactionScheduler: Returns Job UUID | ||
| /// CompactionScheduler-->>MitoEngine: Task scheduled with Job UUID | ||
| /// MitoEngine-->>User: Compaction task scheduled | ||
| /// ``` | ||
| #[async_trait::async_trait] | ||
| pub trait RemoteJobScheduler: Send + Sync + 'static { | ||
| /// Sends a job to the scheduler and returns a UUID for the job. | ||
| async fn schedule(&self, job: RemoteJob, notifier: Arc<dyn Notifier>) -> Result<String>; |
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Enhance documentation for RemoteJobScheduler.schedule.
While the trait and the schedule method are documented, the parameters job and notifier could benefit from more detailed explanations, especially since this method is crucial for the system's operation.
Would you like me to draft additional documentation detailing these parameters?
| /// Notifier is used to notify the mito engine when a remote job is completed. | ||
| #[async_trait::async_trait] | ||
| pub trait Notifier: Send + Sync + 'static { | ||
| /// Notify the mito engine that a remote job is completed. | ||
| async fn notify(&mut self, result: RemoteJobResult); |
There was a problem hiding this comment.
Consider modifying the Notifier.notify method to return a Result.
Returning a Result from notify would allow error propagation to the caller, which is crucial in a distributed system where failures are common.
- async fn notify(&mut self, result: RemoteJobResult);
+ async fn notify(&mut self, result: RemoteJobResult) -> Result<()>;Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| /// Notifier is used to notify the mito engine when a remote job is completed. | |
| #[async_trait::async_trait] | |
| pub trait Notifier: Send + Sync + 'static { | |
| /// Notify the mito engine that a remote job is completed. | |
| async fn notify(&mut self, result: RemoteJobResult); | |
| /// Notifier is used to notify the mito engine when a remote job is completed. | |
| #[async_trait::async_trait] | |
| pub trait Notifier: Send + Sync + 'static { | |
| /// Notify the mito engine that a remote job is completed. | |
| async fn notify(&mut self, result: RemoteJobResult) -> Result<()>; |
| /// CompactionJobResult is the result of a compaction job. | ||
| #[allow(dead_code)] | ||
| pub struct CompactionJobResult { | ||
| pub job_id: String, | ||
| pub region_id: RegionId, | ||
| pub start_time: Instant, | ||
| pub region_edit: Result<RegionEdit>, | ||
| } |
There was a problem hiding this comment.
Consider using Uuid for job_id in CompactionJobResult.
Using a Uuid type instead of String for job_id would enhance type safety and consistency with typical UUID usage patterns.
- pub job_id: String,
+ pub job_id: Uuid,Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| /// CompactionJobResult is the result of a compaction job. | |
| #[allow(dead_code)] | |
| pub struct CompactionJobResult { | |
| pub job_id: String, | |
| pub region_id: RegionId, | |
| pub start_time: Instant, | |
| pub region_edit: Result<RegionEdit>, | |
| } | |
| /// CompactionJobResult is the result of a compaction job. | |
| #[allow(dead_code)] | |
| pub struct CompactionJobResult { | |
| pub job_id: Uuid, | |
| pub region_id: RegionId, | |
| pub start_time: Instant, | |
| pub region_edit: Result<RegionEdit>, | |
| } |
| /// DefaultNotifier is a default implementation of Notifier that sends WorkerRequest to the mito engine. | ||
| pub(crate) struct DefaultNotifier { | ||
| pub(crate) request_sender: Sender<WorkerRequest>, | ||
| pub(crate) waiters: Vec<OutputTx>, | ||
| } | ||
|
|
||
| #[async_trait::async_trait] | ||
| impl Notifier for DefaultNotifier { | ||
| async fn notify(&mut self, result: RemoteJobResult) { | ||
| match result { | ||
| RemoteJobResult::CompactionJobResult(result) => { | ||
| let notify = { | ||
| match result.region_edit { | ||
| Ok(edit) => BackgroundNotify::CompactionFinished(CompactionFinished { | ||
| region_id: result.region_id, | ||
| senders: std::mem::take(&mut self.waiters), | ||
| start_time: result.start_time, | ||
| edit, | ||
| }), | ||
| Err(err) => BackgroundNotify::CompactionFailed(CompactionFailed { | ||
| region_id: result.region_id, | ||
| err: Arc::new(err), | ||
| }), | ||
| } | ||
| }; | ||
|
|
||
| if let Err(e) = self | ||
| .request_sender | ||
| .send(WorkerRequest::Background { | ||
| region_id: result.region_id, | ||
| notify, | ||
| }) | ||
| .await | ||
| { | ||
| error!( | ||
| "Failed to notify compaction job status for region {}, error: {:?}", | ||
| result.region_id, e | ||
| ); | ||
| } | ||
| } | ||
| } | ||
| } |
There was a problem hiding this comment.
Refine error handling and logging in DefaultNotifier.notify.
The current implementation logs errors but does not propagate them. Enhancing error propagation and making the error messages more specific could improve system robustness and debuggability.
- error!(
- "Failed to notify compaction job status for region {}, error: {:?}",
- result.region_id, e
- );
+ return Err(Error::from(e));Consider implementing a more robust error handling strategy that includes error propagation to improve system resilience.
Committable suggestion was skipped due to low confidence.
|
|
||
| /// Notifier is used to notify the mito engine when a remote job is completed. | ||
| #[async_trait::async_trait] | ||
| pub trait Notifier: Send + Sync + 'static { |
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Does the notifier need to be Sync?
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Yes, it needs to be Sync because it will start a periodic task to check the remote compaction status and update the manifest.
src/mito2/src/compaction.rs
Outdated
| .schedule( | ||
| RemoteJob::CompactionJob(remote_compaction_job), | ||
| Arc::new(DefaultNotifier { | ||
| request_sender: request_sender.clone(), | ||
| waiters: std::mem::take(&mut waiters), | ||
| }), | ||
| ) | ||
| .await; |
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If the remote job scheduler returns an error, we will lose all waiters.
Maybe we can put the waiters in the Error so that we can take them back. We can define a dedicated error for the scheduler which wraps mito::error::Error and the waiters, like errors of channels.
Otherwise, we might need to track waiters by the job id. If the scheduler returns an error, we fall back to the local scheduler with the waiters. Once a remote job is finished, we can notify those waiters.
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If we follow the original implementation, maybe I need to add the following code:
impl DefaultNotifier {
fn on_failure(&mut self, err: Arc<Error>, region_id: RegionId) {
COMPACTION_FAILURE_COUNT.inc();
for waiter in self.waiters.drain(..) {
waiter.send(Err(err.clone()).context(CompactRegionSnafu {
region_id,
}));
}
}
}
#[async_trait::async_trait]
impl Notifier for DefaultNotifier {
async fn notify(&mut self, result: RemoteJobResult) {
match result {
RemoteJobResult::CompactionJobResult(result) => {
let notify = {
match result.region_edit {
Ok(edit) => BackgroundNotify::CompactionFinished(CompactionFinished {
region_id: result.region_id,
senders: std::mem::take(&mut self.waiters),
start_time: result.start_time,
edit,
}),
Err(err) => {
error!("Compaction failed for region {}: {:?}", result.region_id, err);
let err = Arc::new(err);
self.on_failure(err.clone(), result.region_id);
BackgroundNotify::CompactionFailed(CompactionFailed {
region_id: result.region_id,
err,
})
}
}
};
if let Err(e) = self
.request_sender
.send(WorkerRequest::Background {
region_id: result.region_id,
notify,
})
.await
{
error!(
"Failed to notify compaction job status for region {}, error: {:?}",
result.region_id, e
);
}
}
}
}
}Should we need to add the new type of error or we can put it in the new PR?
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The new PR has the following refactoring:
- Add the
waitersinRemoteJobSchedulererror; - Move
waitersfromDefaultNotifiertoJob,and it will be convenient to pass between multiple objects;
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Files selected for processing (4)
- src/mito2/src/compaction.rs (16 hunks)
- src/mito2/src/error.rs (5 hunks)
- src/mito2/src/request.rs (1 hunks)
- src/mito2/src/schedule/remote_job_scheduler.rs (1 hunks)
Files skipped from review as they are similar to previous changes (1)
- src/mito2/src/error.rs
Additional comments not posted (7)
src/mito2/src/schedule/remote_job_scheduler.rs (1)
60-64: Consider modifying theNotifier.notifymethod to return aResult.Returning a
Resultfromnotifywould allow error propagation to the caller, which is crucial in a distributed system where failures are common.
The previous comment on this issue is still valid.src/mito2/src/compaction.rs (1)
108-109: Approve addition ofpluginsfield and async modifications.The addition of the
pluginsfield toCompactionSchedulerand the conversion of methods to async are well-aligned with the system's evolution towards supporting remote compactions and asynchronous operations.Also applies to: 119-128
src/mito2/src/request.rs (5)
390-390: Well-structured and clear implementation ofOutputTx.The
OutputTxstruct and itssendmethod are well-implemented, providing a clear and encapsulated way to handle result transmission. The choice to ignore the send result is appropriate here, avoiding unnecessary complexity.Also applies to: 397-398
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408-408: Consider simplifyingOptionOutputTxby removing theOptionwrapper.The implementation of
OptionOutputTxis robust, but as per previous discussions in the PR, consider whether theOptionwrapper is necessary. Using a directOutputTxor an empty vector might simplify the code.
[REFACTOR_SUGGESTion]Also applies to: 410-410, 412-413, 415-416, 418-419, 421-425
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427-429: Good use of theOnFailuretrait for consistent error handling.The introduction of the
OnFailuretrait helps standardize how errors are handled across different parts of the system, which is a good practice for maintainability.
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431-434: Clear and effective struct definitions for request handling.
SenderWriteRequestandWorkerRequestare well-defined and align well with the system’s architecture for handling different types of requests.
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436-493: Comprehensive implementation of background job notifications.The
BackgroundNotifyenum and related structs likeFlushFinishedandCompactionFinishedare well-implemented, providing detailed handling for various background job results. This enhances the system's responsiveness and reliability.
| #[async_trait::async_trait] | ||
| pub trait RemoteJobScheduler: Send + Sync + 'static { | ||
| /// Sends a job to the scheduler and returns a UUID for the job. | ||
| async fn schedule(&self, job: RemoteJob, notifier: Box<dyn Notifier>) -> Result<JobId>; | ||
| } |
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Enhance documentation for RemoteJobScheduler.schedule.
The schedule method is a core part of the remote job scheduling functionality, but it lacks detailed documentation. Detailed explanations on the parameters job and notifier and the method's purpose would be beneficial.
Would you like me to draft additional documentation detailing these parameters?
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Outside diff range and nitpick comments (1)
src/mito2/src/compaction.rs (1)
Line range hint
232-354: Evaluate the fallback mechanism for remote compaction.The logic to fallback to local compaction if remote scheduling fails is crucial for reliability. Review the implementation to ensure that the fallback mechanism is seamless and does not introduce delays or inconsistencies in the compaction process. Consider adding more detailed logging at each step of the fallback to improve observability.
+ debug!("Fallback initiated for region {}", region_id);
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Files selected for processing (2)
- src/mito2/src/compaction.rs (16 hunks)
- src/mito2/src/schedule/remote_job_scheduler.rs (1 hunks)
Files skipped from review as they are similar to previous changes (1)
- src/mito2/src/schedule/remote_job_scheduler.rs
Additional comments not posted (7)
src/mito2/src/compaction.rs (7)
29-30: Approved the enhanced logging capability.The addition of
infologging is consistent with the PR's objectives to enhance telemetry within the system.
108-109: Approved the addition of thepluginsfield toCompactionScheduler.Integrating the
Pluginsstruct is crucial for managing the remote job scheduler functionality, aligning with the PR's objectives to enhance compaction task handling.
119-119: Approved the changes to theCompactionSchedulerconstructor.Accepting a
Pluginsparameter and initializing thepluginsfield are necessary steps to enable the use of the plugin system for remote job scheduling.Also applies to: 128-128
134-134: Approved the asynchronous modification ofschedule_compaction.Converting
schedule_compactionto an asynchronous method is essential for non-blocking operations, especially given the potentially long-running nature of compaction tasks.Also applies to: 162-162
166-166: Approved the asynchronous modification ofon_compaction_finished.Making
on_compaction_finishedasynchronous ensures that the method can handle complex logic and external calls effectively without blocking the system.Also applies to: 191-191
356-363: Approved the changes toremove_region_on_failure.Enhancing the
remove_region_on_failuremethod to handle region removal on failure improves the robustness and cleanliness of state management within the system.
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640-762: Approved the addition of test cases for compaction scheduling.The new test cases effectively verify the behavior of the compaction scheduling logic under various conditions, enhancing the reliability and test coverage of the system.
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Outside diff range and nitpick comments (5)
src/mito2/src/compaction.rs (5)
108-109: Review the integration ofPluginsintoCompactionScheduler.The integration of
Pluginsto manage compaction-related plugins is a strategic enhancement. It aligns with the PR's objective to facilitate plugin-based remote job scheduling. Ensure that thePluginsobject is properly managed across its lifecycle, particularly regarding ownership and mutability concerns.Also applies to: 119-128
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166-191: Assess the error handling inon_compaction_finished.The method correctly handles the scenario where no compaction tasks are pending for a region. However, the error handling could be more robust by ensuring that all potential error paths are logged and handled appropriately to prevent silent failures.
+ error!("No pending compaction tasks for region {}", region_id);
[!TIP]
Codebase VerificationAsynchronous Handling of
schedule_compactionCalls Needs AdjustmentThe calls to the
schedule_compactionfunction in the following files are not properly handling its asynchronous nature. These calls should use the.awaitkeyword to ensure correct execution:
src/mito2/src/worker/handle_compaction.rs.compaction_scheduler .schedule_compaction(
src/mito2/src/worker/handle_flush.rs.compaction_scheduler .schedule_compaction(Please update these calls to handle the asynchronous nature correctly by using
.await.Analysis chain
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134-162: Evaluate the asynchronous implementation ofschedule_compaction.Transforming
schedule_compactionto an async function supports the non-blocking scheduling of compaction tasks. However, ensure that all calling functions are also adapted to handle this asynchronous nature to prevent runtime issues.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify all function calls to `schedule_compaction` are properly handling its asynchronous nature. # Test: Search for the function usage. Expect: Correct async handling in all occurrences. rg --type rust $'schedule_compaction'Length of output: 910
Script:
#!/bin/bash # Description: Verify all function calls to `schedule_compaction` are properly handling its asynchronous nature. # Check each call to `schedule_compaction` for proper async handling. rg --type rust 'schedule_compaction' -A 2Length of output: 2730
Script:
#!/bin/bash # Description: Verify all function calls to `schedule_compaction` are properly handling its asynchronous nature. # Check the context of calls to `schedule_compaction` in the specified files for proper async handling. rg 'schedule_compaction' src/mito2/src/worker/handle_compaction.rs -A 5 -B 5 rg 'schedule_compaction' src/mito2/src/worker/handle_flush.rs -A 5 -B 5Length of output: 883
[!TIP]
Codebase VerificationEnhance logging for fallback to local compaction
The fallback to local compaction is currently logged with the statement:
debug!("Remote compaction is not enabled, fallback to local compaction for region {}", region_id);However, the review comment suggests adding a more explicit log statement to improve traceability. Consider adding the following log statement to ensure comprehensive logging:
debug!("Initiating fallback to local compaction for region {}", region_id);
- File:
src/mito2/src/compaction.rs- Lines: Add the suggested log statement before the existing fallback log statement.
+ debug!("Initiating fallback to local compaction for region {}", region_id);Analysis chain
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232-354: Review the comprehensive implementation ofschedule_compaction_request.This function now handles both local and remote compaction scenarios, including fallback mechanisms. It's crucial to ensure that the fallback to local compaction is seamless and does not introduce additional latency or resource overhead. Also, consider enhancing the logging during the fallback process to improve traceability.
+ debug!("Initiating fallback to local compaction for region {}", region_id);Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the seamless operation of the fallback mechanism in `schedule_compaction_request`. # Test: Search for the function usage. Expect: No reported issues or delays in fallback scenarios. rg --type rust $'schedule_compaction_request'Length of output: 279
Script:
#!/bin/bash # Description: Verify the presence of the debug log statement indicating the fallback to local compaction. # Search for the debug log statement within the `schedule_compaction_request` function. rg 'debug!\("Initiating fallback to local compaction for region \{\}", region_id\);' --type rustLength of output: 98
Script:
#!/bin/bash # Description: Verify the presence of debug log statements related to the fallback mechanism in `schedule_compaction_request`. # Search for all debug log statements within the `schedule_compaction_request` function. rg 'debug!' --type rust -A 5 -B 5Length of output: 121233
[!TIP]
Codebase VerificationEnsure comprehensive testing of asynchronous compaction scheduling.
The current codebase lacks direct test functions for
schedule_compaction. It is crucial to add comprehensive test cases covering various scenarios, including edge cases and error paths, to ensure robust and reliable compaction scheduling.
- Add test cases for
schedule_compactioninsrc/mito2/src/compaction.rsand related files.- Ensure coverage includes edge cases and fallback mechanisms in remote compaction.
Analysis chain
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640-659: Ensure comprehensive testing of asynchronous compaction scheduling.The tests provided seem to cover various scenarios, including empty and populated compaction tasks. However, ensure that these tests are comprehensive enough to cover all edge cases, especially those involving error paths and fallback mechanisms in remote compaction.
Would you like help in enhancing the test coverage or designing specific test cases for edge scenarios?
Also applies to: 699-728, 740-762
Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the coverage and effectiveness of tests for `schedule_compaction`. # Test: Search for additional test cases in the test suite. Expect: Comprehensive coverage including edge cases. rg --type rust $'test_schedule_compaction'Length of output: 41
Script:
#!/bin/bash # Description: Verify the coverage and effectiveness of tests for `schedule_compaction`. # Search for the `schedule_compaction` function definition to understand its context. ast-grep --lang rust --pattern 'fn schedule_compaction($$_) { $$$ }' # Search for test cases that call the `schedule_compaction` function. rg --type rust 'schedule_compaction'Length of output: 981
Script:
#!/bin/bash # Description: Identify test functions in files where `schedule_compaction` is invoked. # List the files where `schedule_compaction` is used. files=$(rg --files-with-matches 'schedule_compaction') # Search for test functions within these files. for file in $files; do echo "Searching for test functions in $file" ast-grep --lang rust --pattern 'fn test_$$_() { $$$ }' $file doneLength of output: 1276
Script:
#!/bin/bash # Description: Identify all test functions across the codebase and check if any involve `schedule_compaction`. # Search for all test functions across the codebase. ast-grep --lang rust --pattern 'fn test_$$_() { $$$ }' # Search for invocations of `schedule_compaction` within the identified test functions. rg --type rust 'schedule_compaction'Length of output: 967
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (3)
- src/mito2/src/compaction.rs (16 hunks)
- src/mito2/src/error.rs (5 hunks)
- src/mito2/src/schedule/remote_job_scheduler.rs (1 hunks)
Additional comments not posted (7)
src/mito2/src/schedule/remote_job_scheduler.rs (3)
62-65: Consider makingNotifier.notifymethod return aResult.The
notifymethod in theNotifiertrait currently does not return aResult, which might limit error handling capabilities. Consider modifying this to return aResult<(), Error>to allow propagation of errors to the caller.
[REFACTOR_Suggestion]- async fn notify(&self, result: RemoteJobResult, waiters: Vec<OutputTx>); + async fn notify(&self, result: RemoteJobResult, waiters: Vec<OutputTx>) -> Result<(), Error>;
130-174: Review error handling strategy inDefaultNotifier.notify.The method
notifyin theDefaultNotifierimplementation logs errors but does not propagate them. Consider enhancing error propagation and making the error messages more specific to improve system robustness and debuggability.
[REFACTOR_Suggestion]- error!( - "Failed to notify compaction job status for region {}, error: {:?}", - result.region_id, e - ); + return Err(Error::from(e));
54-58: EnsureNotifieris provided correctly inRemoteJobScheduler.schedule.The method
schedulein theRemoteJobSchedulertrait takes aBox<dyn Notifier>as a parameter. Ensure that the lifecycle and ownership of thisNotifierare managed properly, especially since it's being passed around in an async environment.src/mito2/src/error.rs (3)
758-765: Review newRemoteJobSchedulererror variant.The new
RemoteJobSchedulererror variant includeswaiterswhich is a good design for notifying about fallbacks. Ensure that this pattern is consistently used across other similar error handling scenarios.
767-773: Check the implementation ofParseJobIderror variant.The
ParseJobIderror variant is well-implemented, leveraging the underlyinguuid::Error. This is a good practice as it uses existing error handling mechanisms provided by theuuidcrate.
799-805: Ensure correct usage ofwaiters_in_remote_job_schedulermethod.The method
waiters_in_remote_job_schedulerextracts waiters from theRemoteJobSchedulererror variant. Verify that this method is used correctly throughout the codebase to ensure proper error recovery and notification.Verification successful
Correct usage of
waiters_in_remote_job_schedulermethod confirmed.The method is used within an error handling block to manage waiters properly when remote compaction scheduling fails, ensuring proper fallback to local compaction.
src/mito2/src/compaction.rs: Correctly handles errors and uses the method to return waiters for local compaction.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the usage of `waiters_in_remote_job_scheduler` method across the codebase. # Test: Search for usage of the method. Expect: Correct usage patterns. rg --type rust $'waiters_in_remote_job_scheduler'Length of output: 234
Script:
#!/bin/bash # Description: Extract the context where `waiters_in_remote_job_scheduler` is used in `src/mito2/src/compaction.rs`. # Search for the method usage and extract surrounding lines for context. rg --type rust -C 5 'waiters_in_remote_job_scheduler' src/mito2/src/compaction.rsLength of output: 602
src/mito2/src/compaction.rs (1)
29-30: Approval of new imports for telemetry and plugins.The addition of
common_base::Pluginsand telemetry functions (debug,error,info) are appropriate for the new functionalities related to remote job scheduling and enhanced logging capabilities.
I hereby agree to the terms of the GreptimeDB CLA.
Refer to a related PR or issue link (optional)
What's changed and what's your intention?
RemoteJobSchedulerFor the storage disaggregated system, we can always offload the CPU-intensive and IO-intensive tasks(for example, compaction and index) to the remote workers. For the above scenario, the PR introduces the abstraction.
RemoteJobScheduleris a trait that defines the API for scheduling remote jobs. Its implementation is in GreptimeDB Enterprise.The PR modify
schedule_compaction_request()to support remote compaction:remote_compactioninregion_optionsand theRemoteJobScheduleris initialized, the Mito will execute remote compaction;Other changes
Add the
asynckeyword for all the compaction-related functions because theschedule_compaction_requestneeds to beasync;Use
Optiontype forsendersinCompactionFinishedbecause we don't need it in remote compaction scenario;Add
remote_compactionin compaction options;TODOs
RemoteJobSchedulerfrom the plugin system;Design the API to fetch the Jobs from the scheduler. When the datanode restarts, it can rebuild the context of the remote job;Add the unit tests for the;RemoteJobSchedulerChecklist
Summary by CodeRabbit
New Features
TwcsOptions.Bug Fixes
RemoteJobSchedulervariant for better debugging.Refactor
CompactionSchedulerand related functions to support new asynchronous and plugin features.Improvements
CompactionOptionsandTwcsOptionsto include remote compaction checks.