Implement adaptive remote task request size #15721

JunhyungSong · 2023-01-14T09:02:31Z

Description

Before the change HttpRemotTask will send all pending splits in one taskUpdateRequest, sometimes causing large request for each task in coordinator.

This change will enable the ability to dynamically split large taskUpdateRequest into several smaller batch to send.

Introduced 4 parameters regarding to this feature:

query.remote-task.enable-adaptive-request-size : to control the enable/disable of the feature
query.remote-task.max-request-size: the max size of taskUpdateRequest
query.remote-task.request-size-headroom: the expected mean value of the taskUpdateRequest will be (request-size-limit - request-size-limit-headroom)
query.remote-task.guaranteed-splits-per-task: guaranteed splits that will be sent in taskUpdateRequest for each task, to prevent deadlock

New revision of #10013.

Additional context and related issues

The problematic situation:
Table has 3884 columns.
Table schema has a “parameters” field with the whole table schema string(~ 300k characters)
Size of each split object(in task update request) is big due to large strings in table properties.
If taskUpdateRequest contains a lot of huge splits like above and send it to the worker through http, it causes coordinator crash due to out of memory.
So, this PR tried to limit the size of taskUpdateRequest not only using max_unacknowledged_splits_per_task, but also using max_remote_task_request_size.

Release notes

( ) This is not user-visible or docs only and no release notes are required.
(x) Release notes are required, please propose a release note for me.
( ) Release notes are required, with the following suggested text:

# Section
* Fix some things. ({issue}`issuenumber`)

JunhyungSong · 2023-01-14T09:05:35Z

This can mitigate concerns mentioned by @pettyjamesm in #15579.

Dith3r · 2023-01-16T08:55:58Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

@@ -670,6 +758,21 @@ private synchronized SplitAssignment getSplitAssignment(PlanNodeId planNodeId)
        boolean pendingNoMoreSplits = Boolean.TRUE.equals(this.noMoreSplits.get(planNodeId));
        boolean noMoreSplits = this.noMoreSplits.containsKey(planNodeId);

+        // limit the number of splits only for a partitioned source
+        if (planFragment.getPartitionedSourceNodes().contains(planNodeId) && splitBatchSize < splits.size()) {


This condition was always evaluated as false due to difference in types.

Dith3r · 2023-01-16T08:57:30Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+                    break;
+                }
+            }
+            if (numSplits <= 0) {


nit. numSplits != 0

Dith3r · 2023-01-16T09:09:55Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+
+            int newSplitBatchSize = (int) ((double) numSplits * ((double) expectedSize / requestSize));
+            newSplitBatchSize = Math.max(guaranteedSplitsPerRequest, Math.min(maxUnacknowledgedSplits, newSplitBatchSize));
+            if (currentSplitBatchSize != newSplitBatchSize) {


If we exceed request size, we should always end up with different number of splits if we did not hit guaranteedSplitsPerRequest. Doing operations on doubles and round by casting, we could end up with infinite loop, as size would be bigger than expected and newSplitBatchSize could stay the same.

Also, source splits could be only a part of requests, and we don't take this into account during limitation of request size.

Parts that can increase significantly is splitAssignments. fragment can increase as well, but it cannot be divided into smaller pieces. That's the reason why there is requestSizeHeadroom.

Dith3r · 2023-01-16T09:11:07Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+                if (taskUpdateRequestJson.length > maxRequestSize && newSplitBatchSize < oldSplitBatchSize) {
+                    log.info("%s - current taskUpdateRequestJson exceeded limit: %d, oldSplitBatchSize: %d, adjustedSplitBatchSize: %d, reschedule.",
+                            taskId, taskUpdateRequestJson.length, oldSplitBatchSize, newSplitBatchSize);
+                    scheduleUpdate();


We should not reschedule if splitAssignments size is equal guaranteedSplitsPerRequest and such request should be processed as it is.

If oldSplitBatchSize == guaranteedSplitsPerRequest, then newSplitBatchSize < oldSplitBatchSize will be always false.

Shouldn't we test here (line 709) taskUpdateRequestJson.length > (maxRequestSize - requestSizeHeadroom)?

If we take requestSize = 6 mb, maxRequestSize = 7 mb, requestSizeHeadroom = 2 mb then in adjustSplitBatchSize expected size will be 5mb, and algorithm will trigger limiting of splits, but we will not trigger scheduleUpdate. Next request will be adjusted to newSplitBatchSize.

If requestSize = 6 mb and maxRequestSize = 7 mb, since requestSize < maxRequestSize, it doesn't need to reschedule. requestSizeHeadroom is for calculating the number of splits only when requestSize > maxRequestSize (given that a request contains not only splits, but also other data). Let me change the logic to call adjustSplitBatchSize only when requestSize > maxRequestSize.

Dith3r · 2023-01-16T09:13:45Z

core/trino-main/src/test/java/io/trino/server/remotetask/TestHttpRemoteTask.java

+        }
+        remoteTask.addSplits(splits);
+
+        poll(() -> testingTaskResource.getTaskSplitAssignment(TABLE_SCAN_NODE_ID) != null);


How adjustment is tested here?

Even though splits is divided into smaller requests, it will eventually send all 1000 splits.

Let me add another poll to check whether splits is actually divided or not.

Can we test if request size did not exceed our maximum?

Dith3r · 2023-01-16T09:20:45Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+    @GuardedBy("this")
+    private int splitBatchSize;
+    @GuardedBy("this")
+    private boolean splitBatchSizeChanged;


Is this variable required, as its purpose is only to present log?

Yes. To prevent repetitive logs. But, let me remove this, since the log would be more fit to debug log level.

Dith3r · 2023-01-16T09:24:04Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+                // and splitBatchSize is updated
+                if (newSplitBatchSize != oldSplitBatchSize) {
+                    splitBatchSize = newSplitBatchSize;
+                    splitBatchSizeChanged = true;


Why is this object property?

Dith3r · 2023-01-16T09:47:15Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

@@ -568,6 +595,12 @@ private synchronized void processTaskUpdate(TaskInfo newValue, List<SplitAssignm
                pendingSourceSplitsWeight -= removedWeight;
            }
        }
+
+        // increment pendingRequestsCounter by 1 when there are still pending splits


Why is this required in processTaskUpdate? This looks more like a way around not sending all splits during sendUpdate. Why pendingSplits instead of pendingSourceSplitsWeight?

Btw. Do you test how this waiting for task update impacts latency to send more splits if we hit request size limit?

Makes sense. I think pendingSourceSplitCount works as well.

Yes. I tested it and there was no noticeable performance impacts. Since sendUpdate is just assigning splits to workers, workers will have sufficient amount of works(splits) to do. guaranteedSplitsPerRequest will guarantee that as well.

Dith3r · 2023-01-18T13:58:53Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+                // set this false to prevent repetitive logs
+                splitBatchSizeChanged = false;
+            }
+            splits = splits.stream()


Maybe use of linkedHashSet would be a better approach here?

My intention was to avoid sorting splits by having splits already inserted into a set which is sorted by sequenceId and just do poll of first splits from this set.

I don't understand what you meant. (especially just do poll of first splits from this set) AFAIK, splits does not guarantee the sequenceId order.

arhimondr

Some comments

arhimondr · 2023-01-18T20:02:08Z

core/trino-main/src/main/java/io/trino/execution/SqlTaskExecution.java

+                        ImmutableSet.copyOf(newSplits),
+                        splitAssignment.isNoMoreSplits());
+            }
+            unacknowledgedSplitAssignment.add(splitAssignment);


Should it be done under the if condition?

arhimondr · 2023-01-18T20:02:44Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+            // Currently it supports only when there is one partitioned source.
+            this.enableAdaptiveTaskRequestSize = numOfPartitionedSources == 1 ? isEnableAdaptiveTaskRequestSize(session) : false;
+            if (numOfPartitionedSources > 1) {
+                log.info("%s - There are more than one partitioned sources: numOfPartitionedSources=%s",


arhimondr · 2023-01-18T20:03:58Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+            int newSplitBatchSize = (int) ((double) numSplits * ((double) expectedSize / requestSize));
+            newSplitBatchSize = Math.max(guaranteedSplitsPerRequest, Math.min(maxUnacknowledgedSplits, newSplitBatchSize));
+            if (currentSplitBatchSize != newSplitBatchSize) {
+                log.info("%s - Split batch size changed: prevSize=%s, newSize=%s", taskId, numSplits, newSplitBatchSize);


arhimondr · 2023-01-18T20:05:00Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+        VersionedDynamicFilterDomains dynamicFilterDomains;
+        Optional<PlanFragment> fragment;
+        byte[] taskUpdateRequestJson;
+        synchronized (this) {


We should minimize the scope of syncrhonization

getSplitAssignments and adjustSplitBatchSize should be synchronized together.

Cannot we pass currentSplitBatchSize to getSplitAssignments?

Let me change splitBatchSize to AtomicInteger, then.

arhimondr · 2023-01-18T20:05:37Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+                    splitBatchSizeChanged = true;
+                }
+                if (taskUpdateRequestJson.length > maxRequestSize && newSplitBatchSize < oldSplitBatchSize) {
+                    log.info("%s - current taskUpdateRequestJson exceeded limit: %d, oldSplitBatchSize: %d, adjustedSplitBatchSize: %d, reschedule.",


arhimondr · 2023-01-18T20:06:13Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+        // limit the number of splits only for a partitioned source
+        if (planFragment.getPartitionedSourceNodes().contains(planNodeId) && splitBatchSize < splits.size()) {
+            if (splitBatchSizeChanged) {
+                log.info("%s - Splits are limited by splitBatchSize: splitBatchSize=%s, splits=%s, planNodeId=%s", taskId, splitBatchSize, splits.size(), planNodeId);


core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

arhimondr · 2023-01-18T20:18:55Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+            this.splitBatchSize = maxUnacknowledgedSplits;
+            long numOfPartitionedSources = planFragment.getPartitionedSources().size();
+            // Currently it supports only when there is one partitioned source.
+            this.enableAdaptiveTaskRequestSize = numOfPartitionedSources == 1 ? isEnableAdaptiveTaskRequestSize(session) : false;


It would be great if it worked for any number / type of sources. Otherwise some queries (such as collocated joins) might still experience the same problem. Would it be possible to have something like targetSplitsPerSource and adjust it according to request size?

We can. But, can we do that as a follow-up of this PR?

It feels like you would need to change quite a bit, but maybe it is more incremental than it seems. Do you think it is worth having two increments?

Yes. I think most of cases there will be one partitioned source (assuming that collocated joins are not common). So, this PR will cover most of cases and unblock #15579.

Dith3r · 2023-01-19T08:08:24Z

core/trino-main/src/main/java/io/trino/execution/SqlTaskExecution.java

+                PlanNodeId planNodeId = splitAssignment.getPlanNodeId();
+                long currentMaxAcknowledgedSplit = maxAcknowledgedSplitByPlanNode.getOrDefault(planNodeId, Long.MIN_VALUE);
+                long maxAcknowledgedSplit = currentMaxAcknowledgedSplit;
+                Set<ScheduledSplit> newSplits = new HashSet<>();


Why not use ImmutableSet.Builder here?

Dith3r · 2023-01-19T08:22:22Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+        Optional<PlanFragment> fragment;
+        byte[] taskUpdateRequestJson;
+        synchronized (this) {
+            int oldSplitBatchSize = splitBatchSize;


nit. oldSplitBatchSize -> currentSplitBatchSize

Dith3r · 2023-01-23T09:23:25Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

@@ -629,6 +692,23 @@ private void sendUpdate()
                dynamicFilterDomains.getDynamicFilterDomains(),
                session.getExchangeEncryptionKey());
        byte[] taskUpdateRequestJson = taskUpdateRequestCodec.toJsonBytes(updateRequest);
+
+        if (enableAdaptiveTaskRequestSize && taskUpdateRequestJson.length > maxRequestSize) {


Testing here taskUpdateRequestJson.length > maxRequestSize disallow to increase currentSplitBatchSize if request size is smaller than expectedSize and we didn't exceed maxUnacknowledgedSplits. Cannot we have taskUpdateRequestJson.length > (maxRequestSize - headroom) in if at 704 line?

Also, it would be nice to test increment behavior.

taskUpdateRequestJson is symmetric of maxRequestSize. the condition in adjustSplitBatchSize should check maxRequestSizeInBytes instead of maxRequestSizeInBytes - requestSizeHeadroomInBytes. Let me update it accordingly.

arhimondr

Generally looks good, some small comments

arhimondr · 2023-01-23T22:57:10Z

core/trino-main/src/main/java/io/trino/SystemSessionProperties.java

@@ -173,6 +173,10 @@
    public static final String ADAPTIVE_PARTIAL_AGGREGATION_ENABLED = "adaptive_partial_aggregation_enabled";
    public static final String ADAPTIVE_PARTIAL_AGGREGATION_MIN_ROWS = "adaptive_partial_aggregation_min_rows";
    public static final String ADAPTIVE_PARTIAL_AGGREGATION_UNIQUE_ROWS_RATIO_THRESHOLD = "adaptive_partial_aggregation_unique_rows_ratio_threshold";
+    public static final String ENABLE_ADAPTIVE_REMOTE_TASK_REQUEST_SIZE = "enable_adaptive_remote_task_request_size";


nit: generally we prefer boolean property names to answer is question, e.g.: ADAPTIVE_PARTIAL_AGGREGATION_ENABLED, SPILL_ENABLED. There are some properties that answer "do" (e.g.: ENABLE_DYNAMIC_FILTERING) but generally it is not preffered. I would recommend calling this property (and respective config properties / variables) as REMOTE_TASK_ADAPTIVE_UPDATE_REQUEST_SIZE_ENABLED

arhimondr · 2023-01-23T22:57:27Z

core/trino-main/src/main/java/io/trino/SystemSessionProperties.java

@@ -173,6 +173,10 @@
    public static final String ADAPTIVE_PARTIAL_AGGREGATION_ENABLED = "adaptive_partial_aggregation_enabled";
    public static final String ADAPTIVE_PARTIAL_AGGREGATION_MIN_ROWS = "adaptive_partial_aggregation_min_rows";
    public static final String ADAPTIVE_PARTIAL_AGGREGATION_UNIQUE_ROWS_RATIO_THRESHOLD = "adaptive_partial_aggregation_unique_rows_ratio_threshold";
+    public static final String ENABLE_ADAPTIVE_REMOTE_TASK_REQUEST_SIZE = "enable_adaptive_remote_task_request_size";
+    public static final String MAX_REMOTE_TASK_REQUEST_SIZE = "max_remote_task_request_size";


maybe REMOTE_TASK_MAX_REQUEST_SIZE to be consistent with other two

arhimondr · 2023-01-23T23:00:07Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

@@ -171,6 +180,11 @@
    private final AtomicBoolean started = new AtomicBoolean(false);
    private final AtomicBoolean aborting = new AtomicBoolean(false);

+    private final int guaranteedSplitsPerRequest;
+    private final long maxRequestSize;


nit: maxRequestSizeInBytes

arhimondr · 2023-01-23T23:00:19Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

@@ -171,6 +180,11 @@
    private final AtomicBoolean started = new AtomicBoolean(false);
    private final AtomicBoolean aborting = new AtomicBoolean(false);

+    private final int guaranteedSplitsPerRequest;
+    private final long maxRequestSize;
+    private final long requestSizeHeadroom;


nit: requestSizeHeadroomInBytes

arhimondr · 2023-01-23T23:01:25Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+    private final int guaranteedSplitsPerRequest;
+    private final long maxRequestSize;
+    private final long requestSizeHeadroom;
+    private final boolean enableAdaptiveTaskRequestSize;


nit: adaptiveUpdateRequestSizeEnabled

arhimondr · 2023-01-23T23:01:45Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+            this.requestSizeHeadroom = getRemoteTaskRequestSizeHeadroom(session).toBytes();
+            this.splitBatchSize = new AtomicInteger(maxUnacknowledgedSplits);
+            long numOfPartitionedSources = planFragment.getPartitionedSources().size();
+            // Currently it supports only when there is one partitioned source.


Please create a TODO issue and link it here

arhimondr · 2023-01-23T23:02:17Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

@@ -568,6 +594,12 @@ private synchronized void processTaskUpdate(TaskInfo newValue, List<SplitAssignm
                pendingSourceSplitsWeight -= removedWeight;
            }
        }
+
+        // increment pendingRequestsCounter by 1 when there are still pending splits


Why wasn't it necessary before?

Before this feature, always all pending splits were added to a request.

arhimondr · 2023-01-23T23:07:39Z

core/trino-main/src/main/java/io/trino/server/remotetask/HttpRemoteTask.java

+     */
+    private int adjustSplitBatchSize(List<SplitAssignment> splitAssignments, long requestSize, long expectedSize, int currentSplitBatchSize)
+    {
+        if ((requestSize > expectedSize && currentSplitBatchSize > guaranteedSplitsPerRequest) || (requestSize < expectedSize && currentSplitBatchSize < maxUnacknowledgedSplits)) {


Why is the (requestSize < expectedSize && currentSplitBatchSize < maxUnacknowledgedSplits) condition necessary? adjustSplitBatchSize is only called when taskUpdateRequestJson.length > maxRequestSize, right?

That's a good point. I mistakenly moved taskUpdateRequestJson.length > maxRequestSize to the upper condition for addressing Kamil's comment. Let me fix it.

Before the change HttpRemotTask will send all pending splits in one taskUpdateRequest, sometimes causing large request for each task in coordinator. This change will enable the ability to dynamically split large taskUpdateRequest into several smaller batch to send. Introduced 4 parameters regarding to this feature: query.remote-task.enable-adaptive-request-size : to control the enable/disable of the feature query.remote-task.max-request-size: the max size of taskUpdateRequest query.remote-task.request-size-headroom: the expected mean value of the taskUpdateRequest will be (request-size-limit - request-size-limit-headroom) query.remote-task.guaranteed-splits-per-task: guaranteed splits that will be sent in taskUpdateRequest for each task, to prevent deadlock

Dith3r · 2023-01-24T08:30:55Z

LGTM % comments

JunhyungSong · 2023-01-27T19:39:55Z

Can someone please help merge this?

arhimondr · 2023-01-30T19:17:22Z

Thanks @JunhyungSong !

cla-bot bot added the cla-signed label Jan 14, 2023

JunhyungSong requested a review from arhimondr January 14, 2023 09:03

JunhyungSong mentioned this pull request Jan 14, 2023

Increase node scheduler config parameters #15579

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JunhyungSong force-pushed the adaptive-remote-task-size branch from b567913 to 4a678f0 Compare January 19, 2023 01:57

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JunhyungSong force-pushed the adaptive-remote-task-size branch from 4a678f0 to 9f274b8 Compare January 23, 2023 07:32

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JunhyungSong mentioned this pull request Jan 24, 2023

Support adaptive remote task request size for tasks having multiple partitioned sources #15820

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arhimondr merged commit 19f18fb into trinodb:master Jan 30, 2023

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Add Trino 407 release notes #15919

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io.trino.testing.QueryFailedException: cannot unset noMoreSplits #15931

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Fix SplitAssignment filtering #15933

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Add config props for adaptive remote task req size #15951

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JunhyungSong deleted the adaptive-remote-task-size branch February 7, 2023 07:08

raunaqmorarka mentioned this pull request Mar 3, 2023

Compress TaskUpdateRequest JSON to avoid running out of native memory #16354

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oneonestar mentioned this pull request Nov 20, 2023

Session properties in doc don't match with the implementation #19826

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Implement adaptive remote task request size #15721

Implement adaptive remote task request size #15721

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JunhyungSong commented Jan 14, 2023

Description

Additional context and related issues

Release notes

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Dith3r commented Jan 24, 2023

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