Worker retry for MSQ task #13353

cryptoe · 2022-11-11T06:29:52Z

Why

Tasks can fail for whatever reason in a large distributed cluster running large jobs. To run large jobs reliably we need a way so that MSQ becomes resilient to such failures.

Description

Adds the ability for MSQ controller task to retry worker task in case of failures.

All the logic is pushed down to the ControllerQueryKernel so that the state machine takes the decision if the work order for the stage needs to be retried.

MSQWorkerTaskLauncher contacts the overlord to figure out if the task is failed. If it detects a failure, it triggers a callback
RetryTask which in turn invokes the retry function.

The retry function is also invoked if we are not able to contact the task from the controller while posting PartitionBoundaries and WorkOrders.

Flow in the retry function is like this:

GetAllTheWorkOrders which need to be retried for the worker
Submit the worker for relaunch via MSQWorkerTaskLauncher
Add the workOrders to workOrdersToRetry
In the main query kernel loop, invoke retryFailedTasks which checks if there are any work orders
If yes, submit work orders once all the workers are ready to process work orders.

As our checkpointed location is stage result output per worker, we retry the worker tasks if the stage is in

NEW
READING_INPUT
PRESHUFFLE_WAITING_FOR_RESULT_PARTITION_BOUNDARIES
PRESHUFFLE_WRITING_OUTPUT

As we need a way to retrieve outputs even if the worker dies in subsequent stages, we need the data to be in DurableStorage hence fault tolerance works only when DurableStorage is enabled.

Guardrails

As we do not want all faults to be retired, only whitelisted error codes are retired ControllerQueryKernel#retriableErrorCodes

We have a max retry limit per worker set at 2.
We have a limit on total retries in a job across all workers set at 100.

Release note

Adds the ability for MSQ controller task to retry worker task in case of failures. This can be set by passing faultTolerance:true in the query context.

Key changed/added classes in this PR

ContollerQueryKernel
ControllerImpl
MSQWorkerTaskLauncher
ControllerStageTracker

This PR has:

been self-reviewed.
- using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
[] added documentation for new or modified features or behaviors.
a release note entry in the PR description.
added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
added or updated version, license, or notice information in licenses.yaml
added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
added integration tests.
been tested in a test Druid cluster.

lgtm-com · 2022-11-11T09:54:41Z

This pull request introduces 1 alert when merging 74fa66f into 56d5c97 - view on LGTM.com

new alerts:

1 for Container contents are never accessed

lgtm-com · 2022-11-13T19:07:03Z

This pull request introduces 1 alert when merging c92b217 into 81d005f - view on LGTM.com

new alerts:

1 for Container contents are never accessed

lgtm-com · 2022-11-13T21:17:52Z

This pull request introduces 1 alert when merging 58da3cf into a3edda3 - view on LGTM.com

new alerts:

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LakshSingla

Thanks for the PR 🥳 Left a few comments for now.

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/Limits.java

...-stage-query/src/main/java/org/apache/druid/msq/kernel/controller/ControllerQueryKernel.java

LakshSingla · 2022-11-15T20:58:35Z

...-core/multi-stage-query/src/main/java/org/apache/druid/msq/indexing/error/MSQFaultUtils.java

+   * Gets the error code from the message. If the messay is empty or null, {@link UnknownFault#CODE} is returned. This method
+   * does not gurantee that the error code we get out of the message is a valid error code.
+   */
+  public static String getErrorCodeFromMessage(String message)


Instead of relying on the manual parsing of the error codes from the message string and defining our own error message schema, can we use jsonMapper somehow to do it for us?

Umm, I do not think so as task status might be received from the tasks table where the status calls are chomped.

...-core/multi-stage-query/src/main/java/org/apache/druid/msq/indexing/error/MSQFaultUtils.java

...query/src/main/java/org/apache/druid/msq/indexing/error/TotalRelaunchLimitExceededFault.java

docs/multi-stage-query/reference.md

LakshSingla · 2022-11-16T03:25:09Z

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/ControllerImpl.java

@@ -551,6 +563,15 @@ private QueryDefinition initializeQueryDefAndState(final Closer closer)
        id(),
        task.getDataSource(),
        context,
+        (failedTask, fault) -> {
+          addToKernelManipulationQueue((kernel) -> {
+            if (isDurableStorageEnabled) {


I think across this PR and #13368, we might need to unify what enabling durable storage, enabling fault tolerance, and enabling durable storage for intermediate steps mean since that might cause confusion in the code as well as to the end user configuring the properties.

Agreed — it should all be controllable by the same faultTolerant setting. We don't want people to have to tweak a bunch of different settings in order to get the full package of behavior.

IMO, it should default to false at first, while we're experimenting with it, but we should change the default to true once we're feeling that it's stable.

IMO, it should default to false at first

Sorry what is it here , isDurableStorageEnabled or a new context param faultTolerantwhich is by default false?

Added a context flag.
if the user sets faultTolerance=true, I enable durableShuffleStorage as well
if the user sets faultTolerance=true, and durableStorage=false its an error.
if the user sets durableStorage=true, faultTolerance context param remains untouched.

...-stage-query/src/main/java/org/apache/druid/msq/kernel/controller/ControllerQueryKernel.java

...i-stage-query/src/main/java/org/apache/druid/msq/kernel/controller/ControllerStagePhase.java

...ge-query/src/main/java/org/apache/druid/msq/indexing/error/WorkerRelaunchedTooManyTimes.java

LakshSingla · 2022-11-16T05:45:43Z

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/indexing/RetryTask.java

+
+import org.apache.druid.msq.indexing.error.MSQFault;
+
+public interface RetryTask


I think this would be better named as RelaunchTask if we are going with relaunch instead of retry everywhere. WDYT?

LakshSingla · 2022-11-16T05:46:01Z

...ore/multi-stage-query/src/main/java/org/apache/druid/msq/indexing/MSQWorkerTaskLauncher.java

+    /**
+     * Enables retrying for the task
+     */
+    public void enableRetrying()


Suggested change

public void enableRetrying()

public void enableRelaunching()

LakshSingla · 2022-11-16T06:10:47Z

...nsions-core/multi-stage-query/src/main/java/org/apache/druid/msq/indexing/MSQWorkerTask.java

@@ -58,11 +61,12 @@ public MSQWorkerTask(
      @JsonProperty("controllerTaskId") final String controllerTaskId,
      @JsonProperty("dataSource") final String dataSource,
      @JsonProperty("workerNumber") final int workerNumber,
-      @JsonProperty("context") final Map<String, Object> context
+      @JsonProperty("context") final Map<String, Object> context,
+      @JsonProperty(value = "retry", defaultValue = "0") final int retryCount


Suggested change

@JsonProperty(value = "retry", defaultValue = "0") final int retryCount

@JsonProperty(value = "relaunch", defaultValue = "0") final int relaunchCount

I think we should drop retry in favour of relaunch (or change everything back to retry) to avoid confusion unless they mean different things. WDYT?

LakshSingla

Going through the code, can there be a case when say a task is present on a mm/indexer which loses network for a while? In that duration, we create a new task and once the older mm/indexer regains the network it also starts processing (which might cause some problems). How is that handled? Does tasksToCleanup method continually clean up the tasks till they are not present?

...-stage-query/src/main/java/org/apache/druid/msq/kernel/controller/ControllerQueryKernel.java

...ore/multi-stage-query/src/main/java/org/apache/druid/msq/indexing/MSQWorkerTaskLauncher.java

gianm

very cool! I took a first pass, mostly focusing on general behavior and the kernel. I will take another pass after hearing back about the kernel stuff.

docs/multi-stage-query/known-issues.md

gianm · 2022-11-21T10:40:48Z

docs/multi-stage-query/reference.md

@@ -234,6 +234,9 @@ The following table lists query limits:
 | Number of output columns for any one stage. | 2,000 | `TooManyColumns` |
 | Number of workers for any one stage. | Hard limit is 1,000. Memory-dependent soft limit may be lower. | `TooManyWorkers` |
 | Maximum memory occupied by broadcasted tables. | 30% of each [processor memory bundle](concepts.md#memory-usage). | `BroadcastTablesTooLarge` |
+| Maximum relaunches per worker. Initial run is not a relaunch. The worker will be spawned 1 + workerRelaunchLimit times before erroring out. | 2 | `WorkerRelaunchedTooManyTimes` |
+| Maximum relaunches across all workers. | 30 | `TotalRelaunchLimitExceededFault` |


Seems low, especially since a single machine can be running many workers that would all fail at the same time.

It'd be better if the two faults had similar names, like TooManyAttemptsForWorker and TooManyAttemptsForJob. Or something like that. Also, don't include Fault in the name of faults.

Updated the maximum relaunched across all workers to 100 but I do agree with @LakshSingla that it should depend on the number of workers of the job eventually.

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/ControllerImpl.java

gianm · 2022-11-21T11:18:13Z

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/ControllerImpl.java

@@ -551,6 +563,15 @@ private QueryDefinition initializeQueryDefAndState(final Closer closer)
        id(),
        task.getDataSource(),
        context,
+        (failedTask, fault) -> {
+          addToKernelManipulationQueue((kernel) -> {
+            if (isDurableStorageEnabled) {


Agreed — it should all be controllable by the same faultTolerant setting. We don't want people to have to tweak a bunch of different settings in order to get the full package of behavior.

IMO, it should default to false at first, while we're experimenting with it, but we should change the default to true once we're feeling that it's stable.

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/ControllerImpl.java

gianm · 2022-11-22T09:10:20Z

...stage-query/src/main/java/org/apache/druid/msq/kernel/controller/ControllerStageTracker.java

+  }
+
+  /**
+   * True if work orders needs to be sent else false.


This javadoc doesn't seem quite right either: it doesn't seem true to me that if all workers are in RESULTS_READY then work orders need to be sent. Please expand the javadoc to explain what this really means.

gianm · 2022-11-22T09:11:41Z

...stage-query/src/main/java/org/apache/druid/msq/kernel/controller/ControllerStageTracker.java

+      return WorkerStagePhase.READING_INPUT;
+    });
+    if (phase != ControllerStagePhase.READING_INPUT) {
+      if (workOrdersNeedToBeSent()) {


Something seems backwards here? The check is workOrdersNeedToBeSent(), but the comment says "if no more work orders need to be sent…". Please clarify.

Updated the method name and the java doc to allWorkOrdersSent

...stage-query/src/main/java/org/apache/druid/msq/kernel/controller/ControllerStageTracker.java

gianm · 2022-11-22T09:22:28Z

...stage-query/src/main/java/org/apache/druid/msq/kernel/controller/ControllerStageTracker.java

  private final int workerCount;

  private final WorkerInputs workerInputs;
+
+  // worker-> workerStagePhase
+  private final Int2ObjectMap<WorkerStagePhase> workerToPhase = new Int2ObjectOpenHashMap<>();


This is a big change. Previously WorkerStagePhase was localized to the worker. Now it's on the controller too. Is the controller state kept in sync with the worker state? If so how does that work? Please explain this stuff in the comment.

// worker-> workerStagePhase
// Controller keeps track of the stage with this map.
// Currently, we rely on the serial nature of the state machine to keep things in sync between the controller and the worker.
// So the worker state in the controller can go out of sync with the actual worker state.

Added the comments.

...-stage-query/src/main/java/org/apache/druid/msq/kernel/controller/ControllerQueryKernel.java

…he#13374) * Migrate current integration batch tests to equivalent MSQ tests using new IT framework * Fix build issues * Trigger Build * Adding more tests and addressing comments * fixBuildIssues * fix dependency issues * Parameterized the test and addressed comments * Addressing comments * fixing checkstyle errors * Adressing comments

# Conflicts: # extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/ControllerImpl.java # extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/guice/MSQIndexingModule.java # extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/kernel/controller/ControllerQueryKernel.java # extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/kernel/controller/ControllerStageTracker.java # extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/kernel/controller/BaseControllerQueryKernelTest.java # extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/kernel/controller/ControllerQueryKernelTest.java

# Conflicts: # extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/ControllerImpl.java # extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/WorkerSketchFetcher.java # extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/exec/WorkerSketchFetcherTest.java

lgtm-com · 2022-12-08T07:59:46Z

This pull request introduces 2 alerts when merging d32397a into d85fb8c - view on LGTM.com

new alerts:

2 for Unused format argument

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adarshsanjeev · 2022-12-08T14:30:13Z

The functions imported after resolving the conflict with sequential merge LGTM and should function in the same way as before. Will finish reviewing the rest as well.

Adding stale task handling in sketchFetcher. Adding UT's.

# Conflicts: # docs/multi-stage-query/reference.md

LakshSingla

Left a few more comments about surrounding methods and classes. Will revisit the PR for stage changes and durable storage changes. Will be punting the changes persisting to statistics collection for now.

docs/multi-stage-query/reference.md

core/src/main/java/org/apache/druid/java/util/common/function/TriConsumer.java

LakshSingla · 2022-12-19T02:58:06Z

core/src/test/java/org/apache/druid/java/util/common/function/TriConsumerTest.java

+{
+
+  @Test
+  public void sanityTest()


I think there should be a test where the consumerA throws an exception after adding to the set, and then we should see if consumerB runs or not.

LakshSingla · 2022-12-19T03:00:46Z

integration-tests-ex/cases/src/test/java/org/apache/druid/testsEx/msq/ITMultiStageQueryHA.java

+    msqHelper.testQueriesFromFile(QUERY_FILE, datasource);
+  }
+
+  private void killTaskAbruptly(String taskIdToKill)


Should this be moved to the IT Framework's core methods instead of being in a specific IT test? Also, is there a better way to do it without invoking the command?

Another way is to use a flag which is passed in the processing stack.
Then in the main code you check if this flag is set, exit the jvm with a non zero code.
As that would require us to change a lot of places, I have gone with this approach.
If more things start using this method, then maybe we can put it there.

integration-tests-ex/cases/src/test/java/org/apache/druid/testsEx/msq/ITMultiStageQueryHA.java

LakshSingla · 2022-12-19T03:12:56Z

...s-core/multi-stage-query/src/main/java/org/apache/druid/msq/util/MultiStageQueryContext.java

@@ -58,10 +58,14 @@
  public static final String CTX_FINALIZE_AGGREGATIONS = "finalizeAggregations";
  private static final boolean DEFAULT_FINALIZE_AGGREGATIONS = true;

-  public static final String CTX_ENABLE_DURABLE_SHUFFLE_STORAGE = "durableShuffleStorage";
+  public static final String CTX_DURABLE_SHUFFLE_STORAGE = "durableShuffleStorage";


Since we now have a fault-tolerant mode that is one step ahead of the shuffle storage, does it make sense to deprecate the durable shuffle storage mode entirely since the time benefits of just using the shuffle storage seem negligible in comparison to using the fault-tolerant mode? (My understanding is that most of the time would be spent in writing/reading from the durable storage which both cases do however with fault tolerance we also enable extra code paths which allow worker retry)

I have featured flagged it just in case we break something. In the future, yes we should remove the durableShuffleStorage context param.

The way it works is

if the user sets faultTolerance=true, I enable durableShuffleStorage as well
if the user sets faultTolerance=true, and durableStorage=false its an error.
if the user sets durableStorage=true, faultTolerance context param remains untouched.

integration-tests-ex/cases/src/test/java/org/apache/druid/testsEx/msq/ITMultiStageQueryHA.java

LakshSingla · 2022-12-19T03:19:29Z

integration-tests-ex/cases/src/test/java/org/apache/druid/testsEx/msq/ITMultiStageQueryHA.java

+        )
+    );
+
+    if (sqlTaskStatus.getState().isFailure()) {


Since we are trying to coordinate between the task running and the IT running, I think we should explore into the SLEEP() function. I encountered this in ITSQLCancelTest, which allows the queries to run for a certain amount of time.
Taken from ITSqlCancelTest

/** * This query will run exactly for 15 seconds. */ private static final String QUERY = "SELECT sleep(CASE WHEN added > 0 THEN 1 ELSE 0 END) FROM wikipedia_editstream WHERE added > 0 LIMIT 15";

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/MSQTasks.java

extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/test/MSQTestBase.java

# Conflicts: # extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/ControllerImpl.java # extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/WorkerSketchFetcher.java # extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/util/MultiStageQueryContext.java # extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/exec/WorkerSketchFetcherAutoModeTest.java # extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/exec/WorkerSketchFetcherTest.java

Created separate module for faultToleranceTests

...ions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/WorkerSketchFetcher.java

...stage-query/src/main/java/org/apache/druid/msq/kernel/controller/ControllerStageTracker.java

extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/exec/MSQSelectTest.java

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/MSQTasks.java

rohangarg

Took a high level pass at the change - LGTM once CI passes

cryptoe · 2023-01-11T02:09:18Z

Thanks, @rohangarg @LakshSingla @adarshsanjeev for the review.

cryptoe added 7 commits November 7, 2022 19:43

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cryptoe added the Area - MSQ For multi stage queries - https://github.com/apache/druid/issues/12262 label Nov 13, 2022

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cryptoe changed the title ~~[DRAFT] Worker retry for MSQ task~~ Worker retry for MSQ task Nov 14, 2022

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Remove stray reference to fix OOM while merging sketches #13475

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# Conflicts: # docs/multi-stage-query/reference.md

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[DRAFT] 26.0.0 release notes #14064

Closed


		import org.apache.druid.msq.indexing.error.MSQFault;

		public interface RetryTask

	@JsonProperty(value = "retry", defaultValue = "0") final int retryCount
	@JsonProperty(value = "relaunch", defaultValue = "0") final int relaunchCount

Worker retry for MSQ task #13353

Worker retry for MSQ task #13353

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cryptoe commented Nov 11, 2022 • edited Loading

Why

Description

Guardrails

Release note

Key changed/added classes in this PR

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