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Merged
merged 6 commits into from
Mar 10, 2025
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Address test issue in QueryPhaseTimeoutTests #124327

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Address test issue in QueryPhaseTimeoutTests
javanna Mar 7, 2025
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[CI] Auto commit changes from spotless
Mar 7, 2025
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javanna Mar 10, 2025
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javanna Mar 10, 2025
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Merge branch 'main' into test/query_phase_timeout_tests_num_docs
javanna Mar 10, 2025
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javanna Mar 10, 2025
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6 changes: 0 additions & 6 deletions muted-tests.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -330,12 +330,6 @@ tests:
- class: org.elasticsearch.smoketest.MlWithSecurityIT
method: test {yaml=ml/3rd_party_deployment/Test start deployment fails while model download in progress}
issue: https://github.com/elastic/elasticsearch/issues/120814
- class: org.elasticsearch.search.query.QueryPhaseTimeoutTests
method: testScorerTimeoutPoints
issue: https://github.com/elastic/elasticsearch/issues/124140
- class: org.elasticsearch.search.query.QueryPhaseTimeoutTests
method: testScorerTimeoutTerms
issue: https://github.com/elastic/elasticsearch/issues/124141
- class: org.elasticsearch.compute.data.BlockMultiValuedTests
method: testToMask {elementType=BOOLEAN nullAllowed=true}
issue: https://github.com/elastic/elasticsearch/issues/124165
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@javanna javanna Mar 10, 2025

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This was caused by a bad merge, I fixed that directly on main with dfe2b24

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123 changes: 112 additions & 11 deletions server/src/test/java/org/elasticsearch/search/query/QueryPhaseTimeoutTests.java
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Expand Up @@ -125,27 +125,35 @@ private static ContextIndexSearcher newContextSearcher(IndexReader reader) throw
);
}

public void testScorerTimeoutTerms() throws IOException {
/**
* Test that a timeout is appropriately handled when the directory reader raises it while loading terms enum
* as the scorer supplier is requested.
*/
public void testScorerSupplierTimeoutTerms() throws IOException {
assumeTrue("Test requires more than one segment", reader.leaves().size() > 1);
int size = randomBoolean() ? 0 : randomIntBetween(100, 500);
scorerTimeoutTest(size, context -> {
scorerSupplierTimeoutTest(size, context -> {
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@cbuescher cbuescher Mar 7, 2025

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I've been reading TimeoutQuery and MatchAllWeight defined in this test class but I'm still not sure how the function passed in triggers the timeout. At least that's what I'm supposing its doing given its name. Maybe its possible to explain this for future readers somehow?

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@cbuescher cbuescher Mar 7, 2025

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I think I found something in ContextIndexSearcher#getTimeoutCheck that pulls things from the search context that we override in "createSearchContextWithTimeout", is that the mechanism? Not that obvious unfortunately if it is.

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@javanna javanna Mar 10, 2025

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I thought the new javadocs would help explaining this.

Test that a timeout is appropriately handled when the (exitable) directory reader raises it while loading terms enum as the scorer is retrieved from the scorer supplier.

The idea of these tests is that a timeout can be raised from different places: either because we wrap the bulk scorer with a cancellable one, or via the exitable directory reader that wraps the original reader. Because a timeout can be raised from different places, it's easy to miss and to forget handling the corresponding exception. The reason why the timeout is thrown is because we flip shouldTimeout in the search context. I am adding a bit more comments.

final TermsEnum termsEnum = context.reader().terms("field").iterator();
termsEnum.next();
});
}

public void testScorerTimeoutPoints() throws IOException {
/**
* Test that a timeout is appropriately handled when the directory reader raises it while loading points
* as the scorer supplier is requested.
*/
public void testScorerSupplierTimeoutPoints() throws IOException {
assumeTrue("Test requires more than one segment", reader.leaves().size() > 1);
int size = randomBoolean() ? 0 : randomIntBetween(100, 500);
scorerTimeoutTest(size, context -> {
scorerSupplierTimeoutTest(size, context -> {
PointValues pointValues = context.reader().getPointValues("long");
pointValues.size();
});
}

private void scorerTimeoutTest(int size, CheckedConsumer<LeafReaderContext, IOException> timeoutTrigger) throws IOException {
private void scorerSupplierTimeoutTest(int size, CheckedConsumer<LeafReaderContext, IOException> timeoutTrigger) throws IOException {
{
TimeoutQuery query = newMatchAllScorerTimeoutQuery(timeoutTrigger, false);
TimeoutQuery query = newMatchAllScorerSupplierTimeoutQuery(timeoutTrigger, false);
try (SearchContext context = createSearchContext(query, size)) {
QueryPhase.executeQuery(context);
assertFalse(context.queryResult().searchTimedOut());
Expand All @@ -154,18 +162,20 @@ private void scorerTimeoutTest(int size, CheckedConsumer<LeafReaderContext, IOEx
}
}
{
TimeoutQuery query = newMatchAllScorerTimeoutQuery(timeoutTrigger, true);
TimeoutQuery query = newMatchAllScorerSupplierTimeoutQuery(timeoutTrigger, true);
try (SearchContext context = createSearchContextWithTimeout(query, size)) {
QueryPhase.executeQuery(context);
assertTrue(context.queryResult().searchTimedOut());
int firstSegmentMaxDoc = reader.leaves().get(0).reader().maxDoc();
assertEquals(Math.min(2048, firstSegmentMaxDoc), context.queryResult().topDocs().topDocs.totalHits.value());
// we are artificially raising the timeout when pulling the scorer supplier.
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@cbuescher cbuescher Mar 7, 2025

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same here: I've been trying to grok this but am most likely missing where the timeout is happening and why.

// We score the entire first segment, then trigger timeout.
assertEquals(firstSegmentMaxDoc, context.queryResult().topDocs().topDocs.totalHits.value());
assertEquals(Math.min(size, firstSegmentMaxDoc), context.queryResult().topDocs().topDocs.scoreDocs.length);
}
}
}

private static TimeoutQuery newMatchAllScorerTimeoutQuery(
private static TimeoutQuery newMatchAllScorerSupplierTimeoutQuery(
CheckedConsumer<LeafReaderContext, IOException> timeoutTrigger,
boolean isTimeoutExpected
) {
Expand All @@ -190,6 +200,95 @@ public ScorerSupplier scorerSupplier(LeafReaderContext context) throws IOExcepti
};
}

/**
* Test that a timeout is appropriately handled when the directory reader raises it while loading terms enum
* as the scorer is retrieved from the scorer supplier
*/
public void testScorerGetTimeoutTerms() throws IOException {
assumeTrue("Test requires more than one segment", reader.leaves().size() > 1);
int size = randomBoolean() ? 0 : randomIntBetween(100, 500);
scorerGetTimeoutTest(size, context -> {
final TermsEnum termsEnum = context.reader().terms("field").iterator();
termsEnum.next();
});
}

/**
* Test that a timeout is appropriately handled when the directory reader raises it while loading points
* as the scorer is retrieved from the scorer supplier
*/
public void testScorerGetTimeoutPoints() throws IOException {
assumeTrue("Test requires more than one segment", reader.leaves().size() > 1);
int size = randomBoolean() ? 0 : randomIntBetween(100, 500);
scorerGetTimeoutTest(size, context -> {
PointValues pointValues = context.reader().getPointValues("long");
pointValues.size();
});
}

private void scorerGetTimeoutTest(int size, CheckedConsumer<LeafReaderContext, IOException> timeoutTrigger) throws IOException {
{
TimeoutQuery query = newMatchAllScorerGetTimeoutQuery(timeoutTrigger, false);
try (SearchContext context = createSearchContext(query, size)) {
QueryPhase.executeQuery(context);
assertFalse(context.queryResult().searchTimedOut());
assertEquals(numDocs, context.queryResult().topDocs().topDocs.totalHits.value());
assertEquals(size, context.queryResult().topDocs().topDocs.scoreDocs.length);
}
}
{
TimeoutQuery query = newMatchAllScorerGetTimeoutQuery(timeoutTrigger, true);
try (SearchContext context = createSearchContextWithTimeout(query, size)) {
QueryPhase.executeQuery(context);
assertTrue(context.queryResult().searchTimedOut());
int firstSegmentMaxDoc = reader.leaves().get(0).reader().maxDoc();
// we are artificially raising the timeout when pulling the scorer supplier.
// We score the entire first segment, then trigger timeout.
assertEquals(firstSegmentMaxDoc, context.queryResult().topDocs().topDocs.totalHits.value());
assertEquals(Math.min(size, firstSegmentMaxDoc), context.queryResult().topDocs().topDocs.scoreDocs.length);
}
}
}

private static TimeoutQuery newMatchAllScorerGetTimeoutQuery(
CheckedConsumer<LeafReaderContext, IOException> timeoutTrigger,
boolean isTimeoutExpected
) {
return new TimeoutQuery() {
@Override
public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) {
return new MatchAllWeight(this, boost, scoreMode) {
boolean firstSegment = true;

@Override
public ScorerSupplier scorerSupplier(LeafReaderContext context) throws IOException {
ScorerSupplier scorerSupplier = super.scorerSupplier(context);
return new ScorerSupplier() {
@Override
public Scorer get(long leadCost) throws IOException {
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@cbuescher cbuescher Mar 7, 2025

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It took me a bit to see the difference between this and the previous override of "ScorerSupplier scorerSupplier(LeafReaderContext context) earlier in this test (L192), maybe its worth adding some more comments around whats different here and why this deserves a second pair of tests.

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@javanna javanna Mar 10, 2025

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can you make a suggestion? I am not sure what I can do to clarify this.

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@cbuescher cbuescher Mar 10, 2025

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Two things that would have helped me understand this test quicker:

  • understand better how the timeout is actually triggered. I think I now understand that the TimeoutQuery.shouldTimeout flag controls this via the modified TestSearchContext that depending on the flags value returns 0/1 in the overwritten "getRelativeTimeInMillis". Mentioning that right next to the flag or maybe somewhere in "createSearchContextWithTimeout" would have helped me find my way quicker I think
  • realizing quicker that the getting the ScoreSupplier in "newMatchAllScorerSupplierTimeoutQuery" triggers the timeout vs. getting the Scorer in "newMatchAllScorerGetTimeoutQuery". Its obvious after you understand the trigger a bit and looked hard enough, but method comments on both of these helpers that point out the difference would have helped a lot. e.g.
// create a TimeoutQuery that triggers the timeout when pulling the scorer supplier after the first segment.
// Note this is different from "newMatchAllScorerGetTimeoutQuery" where we trigger the timeout when we
// get the Scorer from the ScoreSupplier
private static TimeoutQuery newMatchAllScorerSupplierTimeoutQuery(
[...]

and vice-versa. I might have this still wrong because I'm not 100% sure about the details here.

I also just realized the inline comments in the second parts "scorerGetTimeoutTest()" and "scorerSupplierTimeoutTest()" are similar, I think the former would benefit from a slight adjustment to underline the differences as well.

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@javanna javanna Mar 10, 2025

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I thought this was made clear by the javadocs already:

as the scorer is retrieved from the scorer supplier

as opposed to

as the scorer supplier is requested

methods are also named that way to suggest the difference around pulling the supplier as opposed to getting the scorer from the supplier. I totally see that this is tricky.

if (firstSegment == false && isTimeoutExpected) {
shouldTimeout = true;
}
timeoutTrigger.accept(context);
assert shouldTimeout == false : "should have already timed out";
firstSegment = false;
return scorerSupplier.get(leadCost);
}

@Override
public long cost() {
return scorerSupplier.cost();
}
};
}
};
}
};
}

/**
* Test that a timeout is appropriately handled while bulk scoring, via cancellable bulk scorer
*/
public void testBulkScorerTimeout() throws IOException {
int size = randomBoolean() ? 0 : randomIntBetween(100, 500);
{
Expand All @@ -207,6 +306,8 @@ public void testBulkScorerTimeout() throws IOException {
QueryPhase.executeQuery(context);
assertTrue(context.queryResult().searchTimedOut());
int firstSegmentMaxDoc = reader.leaves().get(0).reader().maxDoc();
// See CancellableBulkScorer#INITIAL_INTERVAL for the source of 2048: we always score the first
// batch of up to 2048 docs, and only then raise the timeout
assertEquals(Math.min(2048, firstSegmentMaxDoc), context.queryResult().topDocs().topDocs.totalHits.value());
assertEquals(Math.min(size, firstSegmentMaxDoc), context.queryResult().topDocs().topDocs.scoreDocs.length);
}
Expand All @@ -233,7 +334,7 @@ public long cost() {
}

@Override
public BulkScorer bulkScorer() throws IOException {
public BulkScorer bulkScorer() {
final float score = score();
final int maxDoc = context.reader().maxDoc();
return new BulkScorer() {
Expand All @@ -251,7 +352,7 @@ public int score(LeafCollector collector, Bits acceptDocs, int min, int max) thr
}
if (timeoutExpected) {
// timeout after collecting the first batch of documents from the 1st segment, or the entire 1st
// segment
// segment if max > firstSegment.maxDoc()
shouldTimeout = true;
}
return max == maxDoc ? DocIdSetIterator.NO_MORE_DOCS : max;
Expand Down