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[Tiered Caching] Cache tier policies (opensearch-project#12542)
* Adds policy interface and took time policy impl Signed-off-by: Peter Alfonsi <[email protected]> * Changes IndicesService to write a CachePolicyInfoWrapper before the QSR Signed-off-by: Peter Alfonsi <[email protected]> * Moved took time logic from QSR to IndicesService Signed-off-by: Peter Alfonsi <[email protected]> * spotlessApply Signed-off-by: Peter Alfonsi <[email protected]> * Addressed ansjcy's comments Signed-off-by: Peter Alfonsi <[email protected]> * Partial rebase on most recent changes Signed-off-by: Peter Alfonsi <[email protected]> * Integrated policies with new TSC changes Signed-off-by: Peter Alfonsi <[email protected]> * Reverted unintended change to idea/vcs.xml Signed-off-by: Peter Alfonsi <[email protected]> * javadocs Signed-off-by: Peter Alfonsi <[email protected]> * github actions Signed-off-by: Peter Alfonsi <[email protected]> * Set default threshold value to 10 ms Signed-off-by: Peter Alfonsi <[email protected]> * Addressed Sorabh's comments Signed-off-by: Peter Alfonsi <[email protected]> * Addressed Sorabh's second round of comments Signed-off-by: Peter Alfonsi <[email protected]> * Set cachedQueryParser in IRC Signed-off-by: Peter Alfonsi <[email protected]> * Addressed Sorabh's comments besides dynamic setting Signed-off-by: Peter Alfonsi <[email protected]> * Removed dynamic setting, misc comments Signed-off-by: Peter Alfonsi <[email protected]> * Added changelog entry Signed-off-by: Peter Alfonsi <[email protected]> * Added missing javadoc Signed-off-by: Peter Alfonsi <[email protected]> * Fixed failed gradle run Signed-off-by: Peter Alfonsi <[email protected]> * Added setting validation test Signed-off-by: Peter Alfonsi <[email protected]> * rerun gradle for flaky IT Signed-off-by: Peter Alfonsi <[email protected]> * javadocs Signed-off-by: Peter Alfonsi <[email protected]> --------- Signed-off-by: Peter Alfonsi <[email protected]> Co-authored-by: Peter Alfonsi <[email protected]>
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modules/cache-common/src/main/java/org/opensearch/cache/common/policy/TookTimePolicy.java
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| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
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| /* | ||
| * Modifications Copyright OpenSearch Contributors. See | ||
| * GitHub history for details. | ||
| */ | ||
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| package org.opensearch.cache.common.policy; | ||
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| import org.opensearch.common.cache.policy.CachedQueryResult; | ||
| import org.opensearch.common.unit.TimeValue; | ||
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| import java.util.function.Function; | ||
| import java.util.function.Predicate; | ||
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| /** | ||
| * A cache tier policy which accepts queries whose took time is greater than some threshold. | ||
| * The threshold should be set to approximately the time it takes to get a result from the cache tier. | ||
| * The policy accepts values of type V and decodes them into CachedQueryResult.PolicyValues, which has the data needed | ||
| * to decide whether to admit the value. | ||
| * @param <V> The type of data consumed by test(). | ||
| */ | ||
| public class TookTimePolicy<V> implements Predicate<V> { | ||
| /** | ||
| * The minimum took time to allow a query. Set to TimeValue.ZERO to let all data through. | ||
| */ | ||
| private final TimeValue threshold; | ||
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| /** | ||
| * Function which extracts the relevant PolicyValues from a serialized CachedQueryResult | ||
| */ | ||
| private final Function<V, CachedQueryResult.PolicyValues> cachedResultParser; | ||
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| /** | ||
| * Constructs a took time policy. | ||
| * @param threshold the threshold | ||
| * @param cachedResultParser the function providing policy values | ||
| */ | ||
| public TookTimePolicy(TimeValue threshold, Function<V, CachedQueryResult.PolicyValues> cachedResultParser) { | ||
| if (threshold.compareTo(TimeValue.ZERO) < 0) { | ||
| throw new IllegalArgumentException("Threshold for TookTimePolicy must be >= 0ms but was " + threshold.getStringRep()); | ||
| } | ||
| this.threshold = threshold; | ||
| this.cachedResultParser = cachedResultParser; | ||
| } | ||
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| /** | ||
| * Check whether to admit data. | ||
| * @param data the input argument | ||
| * @return whether to admit the data | ||
| */ | ||
| public boolean test(V data) { | ||
| long tookTimeNanos; | ||
| try { | ||
| tookTimeNanos = cachedResultParser.apply(data).getTookTimeNanos(); | ||
| } catch (Exception e) { | ||
| // If we can't read a CachedQueryResult.PolicyValues from the BytesReference, reject the data | ||
| return false; | ||
| } | ||
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| TimeValue tookTime = TimeValue.timeValueNanos(tookTimeNanos); | ||
| return tookTime.compareTo(threshold) >= 0; | ||
| } | ||
| } |
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modules/cache-common/src/main/java/org/opensearch/cache/common/policy/package-info.java
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| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
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| /** A package for policies controlling what can enter caches. */ | ||
| package org.opensearch.cache.common.policy; |
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...es/cache-common/src/test/java/org/opensearch/cache/common/policy/TookTimePolicyTests.java
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| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
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| package org.opensearch.cache.common.policy; | ||
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| import org.apache.lucene.search.ScoreDoc; | ||
| import org.apache.lucene.search.TopDocs; | ||
| import org.apache.lucene.search.TotalHits; | ||
| import org.opensearch.common.Randomness; | ||
| import org.opensearch.common.cache.policy.CachedQueryResult; | ||
| import org.opensearch.common.io.stream.BytesStreamOutput; | ||
| import org.opensearch.common.lucene.search.TopDocsAndMaxScore; | ||
| import org.opensearch.common.unit.TimeValue; | ||
| import org.opensearch.core.common.bytes.BytesReference; | ||
| import org.opensearch.core.common.io.stream.StreamOutput; | ||
| import org.opensearch.search.DocValueFormat; | ||
| import org.opensearch.search.query.QuerySearchResult; | ||
| import org.opensearch.test.OpenSearchTestCase; | ||
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| import java.io.IOException; | ||
| import java.util.Random; | ||
| import java.util.function.Function; | ||
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| public class TookTimePolicyTests extends OpenSearchTestCase { | ||
| private final Function<BytesReference, CachedQueryResult.PolicyValues> transformationFunction = (data) -> { | ||
| try { | ||
| return CachedQueryResult.getPolicyValues(data); | ||
| } catch (IOException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| }; | ||
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| private TookTimePolicy<BytesReference> getTookTimePolicy(TimeValue threshold) { | ||
| return new TookTimePolicy<>(threshold, transformationFunction); | ||
| } | ||
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| public void testTookTimePolicy() throws Exception { | ||
| double threshMillis = 10; | ||
| long shortMillis = (long) (0.9 * threshMillis); | ||
| long longMillis = (long) (1.5 * threshMillis); | ||
| TookTimePolicy<BytesReference> tookTimePolicy = getTookTimePolicy(new TimeValue((long) threshMillis)); | ||
| BytesReference shortTime = getValidPolicyInput(shortMillis * 1000000); | ||
| BytesReference longTime = getValidPolicyInput(longMillis * 1000000); | ||
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| boolean shortResult = tookTimePolicy.test(shortTime); | ||
| assertFalse(shortResult); | ||
| boolean longResult = tookTimePolicy.test(longTime); | ||
| assertTrue(longResult); | ||
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| TookTimePolicy<BytesReference> disabledPolicy = getTookTimePolicy(TimeValue.ZERO); | ||
| shortResult = disabledPolicy.test(shortTime); | ||
| assertTrue(shortResult); | ||
| longResult = disabledPolicy.test(longTime); | ||
| assertTrue(longResult); | ||
| } | ||
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| public void testNegativeOneInput() throws Exception { | ||
| // PolicyValues with -1 took time can be passed to this policy if we shouldn't accept it for whatever reason | ||
| TookTimePolicy<BytesReference> tookTimePolicy = getTookTimePolicy(TimeValue.ZERO); | ||
| BytesReference minusOne = getValidPolicyInput(-1L); | ||
| assertFalse(tookTimePolicy.test(minusOne)); | ||
| } | ||
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| public void testInvalidThreshold() throws Exception { | ||
| assertThrows(IllegalArgumentException.class, () -> getTookTimePolicy(TimeValue.MINUS_ONE)); | ||
| } | ||
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| private BytesReference getValidPolicyInput(Long tookTimeNanos) throws IOException { | ||
| // When it's used in the cache, the policy will receive BytesReferences which come from | ||
| // serializing a CachedQueryResult. | ||
| CachedQueryResult cachedQueryResult = new CachedQueryResult(getQSR(), tookTimeNanos); | ||
| BytesStreamOutput out = new BytesStreamOutput(); | ||
| cachedQueryResult.writeToNoId(out); | ||
| return out.bytes(); | ||
| } | ||
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| private QuerySearchResult getQSR() { | ||
| // We can't mock the QSR with mockito because the class is final. Construct a real one | ||
| QuerySearchResult mockQSR = new QuerySearchResult(); | ||
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| // duplicated from DfsQueryPhaseTests.java | ||
| mockQSR.topDocs( | ||
| new TopDocsAndMaxScore( | ||
| new TopDocs(new TotalHits(1, TotalHits.Relation.EQUAL_TO), new ScoreDoc[] { new ScoreDoc(42, 1.0F) }), | ||
| 2.0F | ||
| ), | ||
| new DocValueFormat[0] | ||
| ); | ||
| return mockQSR; | ||
| } | ||
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| private void writeRandomBytes(StreamOutput out, int numBytes) throws IOException { | ||
| Random rand = Randomness.get(); | ||
| byte[] bytes = new byte[numBytes]; | ||
| rand.nextBytes(bytes); | ||
| out.writeBytes(bytes); | ||
| } | ||
| } |
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