Add Shard Indexing Pressure Memory Manager (#478) #945

getsaurabh02 · 2021-07-08T20:55:06Z

Signed-off-by: Saurabh Singh sisurab@amazon.com

Description

This PR is 5th of the multiple planned PRs planned for Shard Indexing Pressure (#478). It introduces a Memory Manager for Shard Indexing Pressure. It is responsible for increasing and decreasing the allocated shard limit based on incoming requests, and validate the current values against the thresholds.

Issues Resolved

Addresses Item 5 of #478

ToDo before we move from draft to complete

Condense the core logic for some of the shard limits increment, decrement and isLimitBreached operations for Primary, Replica and Coordinating into one.
Address some of the java comments related to settings and block comments.
Verify and add few more unit tests, to ensure full coverage.

Check List

New functionality includes testing.
- All tests pass
New functionality has been documented.
- New functionality has javadoc added
Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

…t#478) Signed-off-by: Saurabh Singh <sisurab@amazon.com>

opensearch-ci-bot · 2021-07-08T20:55:53Z

✅ Gradle Wrapper Validation success 5b3f104

opensearch-ci-bot · 2021-07-08T20:56:43Z

✅ DCO Check Passed 5b3f104

opensearch-ci-bot · 2021-07-08T21:10:31Z

✅ Gradle Precommit success 5b3f104

Bukhtawar

Thanks lets break down redundant logic across methods

Bukhtawar · 2021-07-09T06:06:30Z

server/src/main/java/org/opensearch/index/ShardIndexingPressureMemoryManager.java

+     * Throughput of last N request divided by the total lifetime requests throughput is greater than the acceptable
+     * degradation limits then we say this parameter has breached the threshold.
+     */
+    private boolean  evaluateThroughputDegradationLimitsBreached(PerformanceTracker performanceTracker, StatsTracker statsTracker,


nit space before method name

Bukhtawar · 2021-07-09T06:51:39Z

server/src/main/java/org/opensearch/index/ShardIndexingPressureMemoryManager.java

+    public final AtomicLong totalNodeLimitsBreachedRejections = new AtomicLong();
+    public final AtomicLong totalLastSuccessfulRequestLimitsBreachedRejections = new AtomicLong();
+    public final AtomicLong totalThroughputDegradationLimitsBreachedRejections = new AtomicLong();


Not a good practise to expose public non-static/non-final member variables. How do you prevent it from illegal modification from outside this class?

Yes this was unintended miss in the initial Draft PR. This is now updated in the final PR.

Bukhtawar · 2021-07-09T10:07:02Z

server/src/main/java/org/opensearch/index/ShardIndexingPressureMemoryManager.java

+        if(shardMemoryLimitsBreached) {
+            // Secondary Parameters (i.e. LastSuccessfulRequestDuration and Throughput) is taken into consideration when
+            // the current node utilization is greater than primary_parameter.node.soft_limit of total node limits.
+            if(((double)nodeTotalBytes / this.shardIndexingPressureSettings.getNodePrimaryAndCoordinatingLimits()) < this.nodeSoftLimit) {
+                boolean isShardLimitsIncreased = this.increaseShardPrimaryAndCoordinatingLimits(tracker);
+                if(isShardLimitsIncreased == false) {
+                    tracker.getPrimaryOperationTracker().getRejectionTracker().incrementNodeLimitsBreachedRejections();
+                    totalNodeLimitsBreachedRejections.incrementAndGet();
+                }
+                return !isShardLimitsIncreased;
+            } else {
+                boolean shardLastSuccessfulRequestDurationLimitsBreached =
+                    this.evaluateLastSuccessfulRequestDurationLimitsBreached(tracker.getPrimaryOperationTracker().getPerformanceTracker(),
+                        requestStartTime);
+
+                if(shardLastSuccessfulRequestDurationLimitsBreached) {
+                    tracker.getPrimaryOperationTracker().getRejectionTracker()
+                        .incrementLastSuccessfulRequestLimitsBreachedRejections();
+                    totalLastSuccessfulRequestLimitsBreachedRejections.incrementAndGet();
+                    return true;
+                }
+
+                boolean shardThroughputDegradationLimitsBreached =
+                    this.evaluateThroughputDegradationLimitsBreached(tracker.getPrimaryOperationTracker().getPerformanceTracker(),
+                        tracker.getPrimaryOperationTracker().getStatsTracker(),
+                        primaryAndCoordinatingThroughputDegradationLimits);
+
+                if (shardThroughputDegradationLimitsBreached) {
+                    tracker.getPrimaryOperationTracker().getRejectionTracker()
+                        .incrementThroughputDegradationLimitsBreachedRejections();
+                    totalThroughputDegradationLimitsBreachedRejections.incrementAndGet();
+                    return true;
+                }
+
+                boolean isShardLimitsIncreased = this.increaseShardPrimaryAndCoordinatingLimits(tracker);
+                if(isShardLimitsIncreased == false) {
+                    tracker.getPrimaryOperationTracker().getRejectionTracker().incrementNodeLimitsBreachedRejections();
+                    totalNodeLimitsBreachedRejections.incrementAndGet();
+                }
+
+                return !isShardLimitsIncreased;
+            }


Redundant logic across primary/replica across multiple methods. This would be a serious maintainability overhead. Lets break this down as

public void onShardMemoryLimitIncreased(OperationTracker opTracker, Predicate<OperationTracker> isShardLimitsIncreasedPredicate, double degradationLimits, double shardLimits) { blah.... }

Agree, this was planned and was added as a ToDo in the Draft PR description. Has now been taken care of in the final PR.

Signed-off-by: Saurabh Singh <sisurab@amazon.com>

opensearch-ci-bot · 2021-07-12T09:04:21Z

✅ Gradle Wrapper Validation success a927825

opensearch-ci-bot · 2021-07-12T09:04:44Z

✅ DCO Check Passed a927825

opensearch-ci-bot · 2021-07-12T09:13:34Z

✅ Gradle Precommit success a927825

Bukhtawar · 2021-07-14T08:09:59Z

server/src/main/java/org/opensearch/index/ShardIndexingPressureMemoryManager.java

+            tracker.getCoordinatingOperationTracker().getRejectionTracker().incrementNodeLimitsBreachedRejections();
+            this.totalNodeLimitsBreachedRejections.incrementAndGet();


Lets club these two across methods together so that the other doesn't get missed out whenever we update one?

nice idea, thanks.

Bukhtawar · 2021-07-14T08:10:24Z

server/src/main/java/org/opensearch/index/ShardIndexingPressureMemoryManager.java

+                this.shardIndexingPressureSettings.getNodePrimaryAndCoordinatingLimits());
+            tracker.getCoordinatingOperationTracker().getRejectionTracker().incrementNodeLimitsBreachedRejections();
+            this.totalNodeLimitsBreachedRejections.incrementAndGet();
+


nit: extra line break

Bukhtawar · 2021-07-14T09:35:20Z

server/src/main/java/org/opensearch/index/ShardIndexingPressureTracker.java

+        public long updateLastSuccessfulRequestTimestamp(long timeStamp) {
+            return lastSuccessfulRequestTimestamp.getAndSet(timeStamp);
+        }
+


This doesn't have to AtomicLong, just volatile should work

Bukhtawar · 2021-07-14T09:40:01Z

server/src/main/java/org/opensearch/index/ShardIndexingPressureMemoryManager.java

+    private boolean evaluateThroughputDegradationLimitsBreached(PerformanceTracker performanceTracker, StatsTracker statsTracker,
+                                                                double degradationLimits) {
+        double throughputMovingAverage =  Double.longBitsToDouble(performanceTracker.getThroughputMovingAverage());
+        long throughputMovingQueueSize = performanceTracker.getThroughputMovingQueueSize();
+        double throughputHistoricalAverage = (double)statsTracker.getTotalBytes() / performanceTracker.getLatencyInMillis();
+        return throughputMovingAverage > 0 && throughputMovingQueueSize >= this.shardIndexingPressureSettings.getRequestSizeWindow() &&
+            throughputHistoricalAverage / throughputMovingAverage > degradationLimits;
+    }
+
+    /**
+     * This evaluation returns true if the difference in the current timestamp and last successful request timestamp is greater than
+     * the successful request elapsed-timeout threshold, and the total number of outstanding requests is greater than
+     * the maximum outstanding request-count threshold.
+     */
+    private boolean evaluateLastSuccessfulRequestDurationLimitsBreached(PerformanceTracker performanceTracker, long requestStartTime) {
+        return (performanceTracker.getLastSuccessfulRequestTimestamp() > 0) &&
+            (requestStartTime - performanceTracker.getLastSuccessfulRequestTimestamp()) > this.successfulRequestElapsedTimeout &&
+            performanceTracker.getTotalOutstandingRequests() > this.maxOutstandingRequests;
+    }


Lets make them package private to test the logic out

Effects of these methods are already tested under tests for the public methods of the class, such as tests with suffixes:

SoftLimitBreachedAndLastSuccessfulRequestLimitRejections SoftLimitBreachedAndLessOutstandingRequestsAndNoLastSuccessfulRequestLimitRejections SoftLimitBreachedAndThroughputDegradationLimitRejections SoftLimitBreachedAndMovingAverageQueueNotBuildUpAndNoThroughputDegradationLimitRejections SoftLimitBreachedAndNoSecondaryParameterBreachedAndNodeLevelRejections

Bukhtawar · 2021-07-14T09:40:21Z

server/src/main/java/org/opensearch/index/ShardIndexingPressureMemoryManager.java

+        }
+    }
+
+    private boolean increaseShardLimits(ShardId shardId, long nodeLimit,


Lets add tests for this.

All the paths for this are already covered in the tests for the public contracts of the class such as isCoordinatingShardLimitBreached, for ex tests with suffixes:

ShardLimitsNotBreached ShardLimitsIncreasedAndSoftLimitNotBreached SoftLimitNotBreachedAndNodeLevelRejections SoftLimitBreachedAndNodeLevelRejections SoftLimitBreachedAndNoSecondaryParameterBreachedAndNodeLevelRejections

Bukhtawar · 2021-07-14T09:41:57Z

server/src/test/java/org/opensearch/index/ShardIndexingPressureMemoryManagerTests.java

+        tracker2.compareAndSetPrimaryAndCoordinatingLimits(tracker2.getPrimaryAndCoordinatingLimits(), 6 * 1024);
+        long limit1 = tracker1.getPrimaryAndCoordinatingLimits();
+        long limit2 = tracker2.getPrimaryAndCoordinatingLimits();
+        long requestStartTime = System.currentTimeMillis();


Use System.nanoTime for logical times

Sure. I seeSystem.currentTimeMillis frequently used across tests. Given the benefits, other than precision, any specific reason for recommendation?

Bukhtawar · 2021-07-14T09:44:11Z

server/src/main/java/org/opensearch/index/ShardIndexingPressureMemoryManager.java

+            if(((double)shardCurrentBytes / currentShardLimit) > this.upperOperatingFactor) {
+                newShardLimit = (long)(shardCurrentBytes / this.optimalOperatingFactor);
+                long totalShardLimitsExceptCurrentShard = this.shardIndexingPressureStore.getShardIndexingPressureHotStore()
+                    .entrySet().stream()
+                    .filter(entry -> (shardId != entry.getKey()))
+                    .map(Map.Entry::getValue)
+                    .mapToLong(getShardLimitFunction).sum();
+


This might turn out costly based on the high concurrency of incoming traffic

These are pure computations, without any allocation or synchronisation overhead.

Yes I meant computation overhead, even that has a cost and time complexity

Yes, we have done Rally benchmarking for os indexing path with backpressure feature enabled. I will be sharing the results once we have the framework level constructs rolled out as well.

Signed-off-by: Saurabh Singh <sisurab@amazon.com>

opensearch-ci-bot · 2021-07-14T11:23:08Z

✅ DCO Check Passed 1546338

opensearch-ci-bot · 2021-07-14T11:23:54Z

✅ Gradle Wrapper Validation success 1546338

opensearch-ci-bot · 2021-07-14T11:31:03Z

✅ Gradle Precommit success 1546338

Bukhtawar · 2021-07-14T17:26:08Z

server/src/main/java/org/opensearch/index/ShardIndexingPressureMemoryManager.java

+ *
+ */
+public class ShardIndexingPressureMemoryManager {
+    private final Logger logger = LogManager.getLogger(getClass());


nit: static

Bukhtawar · 2021-07-14T17:27:45Z

server/src/main/java/org/opensearch/index/ShardIndexingPressureMemoryManager.java

+    public static final Setting<Integer> SUCCESSFUL_REQUEST_ELAPSED_TIMEOUT =
+        Setting.intSetting("shard_indexing_pressure.secondary_parameter.successful_request.elapsed_timeout", 300000,
+            Setting.Property.NodeScope, Setting.Property.Dynamic);


Use Setting<TimeValue> instead, the current timeout doesn't capture units

Its better if you name secondary_parameter else it gets hard for users to understand and tune

Bukhtawar · 2021-07-14T17:29:34Z

server/src/main/java/org/opensearch/index/ShardIndexingPressureMemoryManager.java

+    public static final Setting<Double> THROUGHPUT_DEGRADATION_LIMITS =
+        Setting.doubleSetting("shard_indexing_pressure.secondary_parameter.throughput.degradation_factor", 5.0d, 1.0d,
+            Setting.Property.NodeScope, Setting.Property.Dynamic);
+
+    /**
+     * The node level soft limit determines when the secondary parameters for shard is to be evaluated for degradation.
+     */
+    public static final Setting<Double> NODE_SOFT_LIMIT =
+        Setting.doubleSetting("shard_indexing_pressure.primary_parameter.node.soft_limit", 0.7d, 0.0d,
+            Setting.Property.NodeScope, Setting.Property.Dynamic);


Both these setting names are non-intuitive

I have tried grouping the settings in two buckets as primary_parameter and secondary_parameter for ease of classification and tuning. Let me know if you have any specific suggestions. Moreover, we will have documentation with description and role for each settings, covering more details, as part of the rollout. This should bring in clarity around usage with examples.

Bukhtawar · 2021-07-14T17:35:55Z

server/src/main/java/org/opensearch/index/ShardIndexingPressureMemoryManager.java

+            if(((double)shardCurrentBytes / currentShardLimit) > this.upperOperatingFactor) {
+                newShardLimit = (long)(shardCurrentBytes / this.optimalOperatingFactor);
+                long totalShardLimitsExceptCurrentShard = this.shardIndexingPressureStore.getShardIndexingPressureHotStore()
+                    .entrySet().stream()
+                    .filter(entry -> (shardId != entry.getKey()))
+                    .map(Map.Entry::getValue)
+                    .mapToLong(getShardLimitFunction).sum();
+


Yes I meant computation overhead, even that has a cost and time complexity

Signed-off-by: Saurabh Singh <sisurab@amazon.com>

opensearch-ci-bot · 2021-07-16T09:56:18Z

✅ Gradle Wrapper Validation success 5276ee8

opensearch-ci-bot · 2021-07-16T09:56:47Z

✅ DCO Check Passed 5276ee8

opensearch-ci-bot · 2021-07-16T10:08:16Z

✅ Gradle Precommit success 5276ee8

Bukhtawar · 2021-07-16T12:02:41Z

Thanks Just check on the performance of the while loop for high concurrent requests during load tests

It introduces a Memory Manager for Shard Indexing Pressure. It is responsible for increasing and decreasing the allocated shard limit based on incoming requests, and validate the current values against the thresholds. Signed-off-by: Saurabh Singh <sisurab@amazon.com>

…pensearch-project#945) It introduces a Memory Manager for Shard Indexing Pressure. It is responsible for increasing and decreasing the allocated shard limit based on incoming requests, and validate the current values against the thresholds. Signed-off-by: Saurabh Singh <sisurab@amazon.com>

Shard level indexing pressure improves the current Indexing Pressure framework which performs memory accounting at node level and rejects the requests. This takes a step further to have rejections based on the memory accounting at shard level along with other key performance factors like throughput and last successful requests. **Key features** - Granular tracking of indexing tasks performance, at every shard level, for each node role i.e. coordinator, primary and replica. - Smarter rejections by discarding the requests intended only for problematic index or shard, while still allowing others to continue (fairness in rejection). - Rejections thresholds governed by combination of configurable parameters (such as memory limits on node) and dynamic parameters (such as latency increase, throughput degradation). - Node level and shard level indexing pressure statistics exposed through stats api. - Integration of Indexing pressure stats with Plugins for for metric visibility and auto-tuning in future. - Control knobs to tune to the key performance thresholds which control rejections, to address any specific requirement or issues. - Control knobs to run the feature in shadow-mode or enforced-mode. In shadow-mode only internal rejection breakdown metrics will be published while no actual rejections will be performed. The changes were divided into small manageable chunks as part of the following PRs against a feature branch. - Add Shard Indexing Pressure Settings. #716 - Add Shard Indexing Pressure Tracker. #717 - Refactor IndexingPressure to allow extension. #718 - Add Shard Indexing Pressure Store #838 - Add Shard Indexing Pressure Memory Manager #945 - Add ShardIndexingPressure framework level construct and Stats #1015 - Add Indexing Pressure Service which acts as orchestrator for IP #1084 - Add plumbing logic for IndexingPressureService in Transport Actions. #1113 - Add shard indexing pressure metric/stats via rest end point. #1171 - Add shard indexing pressure integration tests. #1198 Signed-off-by: Saurabh Singh <sisurab@amazon.com> Co-authored-by: Saurabh Singh <sisurab@amazon.com> Co-authored-by: Rabi Panda <adnapibar@gmail.com>

Shard level indexing pressure improves the current Indexing Pressure framework which performs memory accounting at node level and rejects the requests. This takes a step further to have rejections based on the memory accounting at shard level along with other key performance factors like throughput and last successful requests. **Key features** - Granular tracking of indexing tasks performance, at every shard level, for each node role i.e. coordinator, primary and replica. - Smarter rejections by discarding the requests intended only for problematic index or shard, while still allowing others to continue (fairness in rejection). - Rejections thresholds governed by combination of configurable parameters (such as memory limits on node) and dynamic parameters (such as latency increase, throughput degradation). - Node level and shard level indexing pressure statistics exposed through stats api. - Integration of Indexing pressure stats with Plugins for for metric visibility and auto-tuning in future. - Control knobs to tune to the key performance thresholds which control rejections, to address any specific requirement or issues. - Control knobs to run the feature in shadow-mode or enforced-mode. In shadow-mode only internal rejection breakdown metrics will be published while no actual rejections will be performed. The changes were divided into small manageable chunks as part of the following PRs against a feature branch. - Add Shard Indexing Pressure Settings. opensearch-project#716 - Add Shard Indexing Pressure Tracker. opensearch-project#717 - Refactor IndexingPressure to allow extension. opensearch-project#718 - Add Shard Indexing Pressure Store opensearch-project#838 - Add Shard Indexing Pressure Memory Manager opensearch-project#945 - Add ShardIndexingPressure framework level construct and Stats opensearch-project#1015 - Add Indexing Pressure Service which acts as orchestrator for IP opensearch-project#1084 - Add plumbing logic for IndexingPressureService in Transport Actions. opensearch-project#1113 - Add shard indexing pressure metric/stats via rest end point. opensearch-project#1171 - Add shard indexing pressure integration tests. opensearch-project#1198 Signed-off-by: Saurabh Singh <sisurab@amazon.com> Co-authored-by: Saurabh Singh <sisurab@amazon.com> Co-authored-by: Rabi Panda <adnapibar@gmail.com>

Shard level indexing pressure improves the current Indexing Pressure framework which performs memory accounting at node level and rejects the requests. This takes a step further to have rejections based on the memory accounting at shard level along with other key performance factors like throughput and last successful requests. **Key features** - Granular tracking of indexing tasks performance, at every shard level, for each node role i.e. coordinator, primary and replica. - Smarter rejections by discarding the requests intended only for problematic index or shard, while still allowing others to continue (fairness in rejection). - Rejections thresholds governed by combination of configurable parameters (such as memory limits on node) and dynamic parameters (such as latency increase, throughput degradation). - Node level and shard level indexing pressure statistics exposed through stats api. - Integration of Indexing pressure stats with Plugins for for metric visibility and auto-tuning in future. - Control knobs to tune to the key performance thresholds which control rejections, to address any specific requirement or issues. - Control knobs to run the feature in shadow-mode or enforced-mode. In shadow-mode only internal rejection breakdown metrics will be published while no actual rejections will be performed. The changes were divided into small manageable chunks as part of the following PRs against a feature branch. - Add Shard Indexing Pressure Settings. #716 - Add Shard Indexing Pressure Tracker. #717 - Refactor IndexingPressure to allow extension. #718 - Add Shard Indexing Pressure Store #838 - Add Shard Indexing Pressure Memory Manager #945 - Add ShardIndexingPressure framework level construct and Stats #1015 - Add Indexing Pressure Service which acts as orchestrator for IP #1084 - Add plumbing logic for IndexingPressureService in Transport Actions. #1113 - Add shard indexing pressure metric/stats via rest end point. #1171 - Add shard indexing pressure integration tests. #1198 Signed-off-by: Saurabh Singh <sisurab@amazon.com> Co-authored-by: Saurabh Singh <sisurab@amazon.com> Co-authored-by: Rabi Panda <adnapibar@gmail.com>

…arch-project#945) * Bump com.github.jk1.dependency-license-report from 2.6 to 2.7 Bumps com.github.jk1.dependency-license-report from 2.6 to 2.7. --- updated-dependencies: - dependency-name: com.github.jk1.dependency-license-report dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com> * Update changelog Signed-off-by: dependabot[bot] <support@github.com> --------- Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: dependabot[bot] <dependabot[bot]@users.noreply.github.com>

Add Shard Indexing Pressure Memory Manager - Draft (opensearch-projec…

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…t#478) Signed-off-by: Saurabh Singh <sisurab@amazon.com>

Bukhtawar reviewed Jul 9, 2021

View reviewed changes

Added some refactoring for logic consolidation and few tests.

a927825

Signed-off-by: Saurabh Singh <sisurab@amazon.com>

getsaurabh02 marked this pull request as ready for review July 12, 2021 09:03

Bukhtawar reviewed Jul 14, 2021

View reviewed changes

Addressed few PR comments.

1546338

Signed-off-by: Saurabh Singh <sisurab@amazon.com>

Bukhtawar reviewed Jul 14, 2021

View reviewed changes

Changed request elapsed timeout setting to TimeValue.

5276ee8

Signed-off-by: Saurabh Singh <sisurab@amazon.com>

getsaurabh02 changed the title ~~Add Shard Indexing Pressure Memory Manager - Draft (#478)~~ Add Shard Indexing Pressure Memory Manager (#478) Jul 16, 2021

Bukhtawar approved these changes Jul 16, 2021

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adnapibar approved these changes Jul 20, 2021

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adnapibar merged commit 1edc869 into opensearch-project:feature/478_indexBackPressure Jul 20, 2021

adnapibar mentioned this pull request Jul 20, 2021

[Meta] Shard level Indexing Back-Pressure #478

Closed

tlfeng added enhancement Enhancement or improvement to existing feature or request opendistro-port Features ported from OpenDistro v2.0.0 Version 2.0.0 labels Jul 30, 2021

adnapibar mentioned this pull request Sep 28, 2021

Merge shard level Indexing back-pressure feature branch #1310

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getsaurabh02 mentioned this pull request Oct 6, 2021

Shard Indexing Pressure changes to be merged #1336

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getsaurabh02 mentioned this pull request Oct 7, 2021

[Backport] Add Shard Level Indexing Pressure (#478) to 1.x #1343

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		tracker.getCoordinatingOperationTracker().getRejectionTracker().incrementNodeLimitsBreachedRejections();
		this.totalNodeLimitsBreachedRejections.incrementAndGet();

Add Shard Indexing Pressure Memory Manager (#478) #945

Add Shard Indexing Pressure Memory Manager (#478) #945

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getsaurabh02 commented Jul 8, 2021 • edited Loading

Description

Issues Resolved

ToDo before we move from draft to complete

Check List

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opensearch-ci-bot commented Jul 16, 2021

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