8000 Bug fix/search 238 late materialization with constrained heap (#14722) · arangodb/arangodb@46e4732 · GitHub
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Andrei Lobov
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Bug fix/search 238 late materialization with constrained heap (#14722)
* add test for view case * find a better place for sort * fix formatting * add index case test * moar tests * temporary relaxed assertion
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‎CHANGELOG‎

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@@ -1,6 +1,9 @@
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v3.8.1 (XXXX-XX-XX)
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-------------------
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* SEARCH-238: Improved SortNodes placement optimization in cluster so
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late materialization could cover more cases
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* Reduce internal priority of AQL execution. This prevents possible deadlocks
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with modification operations in a cluster and replicationFactor >= 2, and can
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also improve responsiveness under high load of AQL queries.

‎arangod/Aql/OptimizerRules.cpp‎

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@@ -4870,6 +4870,7 @@ void arangodb::aql::distributeSortToClusterRule(Optimizer* opt,
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OptimizerRule const& rule) {
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::arangodb::containers::SmallVector<ExecutionNode*>::allocator_type::arena_type a;
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::arangodb::containers::SmallVector<ExecutionNode*> nodes{a};
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VarSet usedBySort;
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plan->findNodesOfType(nodes, EN::GATHER, true);
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bool modified = false;
@@ -4931,14 +4932,37 @@ void arangodb::aql::distributeSortToClusterRule(Optimizer* opt,
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case EN::SORT: {
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auto thisSortNode = ExecutionNode::castTo<SortNode*>(inspectNode);
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usedBySort.clear();
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thisSortNode->getVariablesUsedHere(usedBySort);
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// remember our cursor...
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parents = inspectNode->getParents();
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// then unlink the filter/calculator from the plan
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plan->unlinkNode(inspectNode);
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// and re-insert into plan in front of the remoteNode
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if (thisSortNode->_reinsertInCluster) {
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plan->insertDependency(rn, inspectNode);
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// let's look for the best place for that SORT.
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// We could skip over several calculations if
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// they are not needed for our sort. So we could calculate
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// more lazily and even make late materialization possible
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ExecutionNode* insertPoint = rn;
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auto current = insertPoint->getFirstDependency();
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while (current != nullptr &&
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current->getType() == EN::CALCULATION) {
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auto nn = ExecutionNode::castTo<CalculationNode*>(current);
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if (!nn->expression()->isDeterministic()) {
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// let's not touch non-deterministic calculation
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// as results may depend on calls count and sort could change this
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break;
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}
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auto variable = nn->outVariable();
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if (usedBySort.find(variable) == usedBySort.end()) {
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insertPoint = current;
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} else {
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break; // first node used by sort. We should stop here.
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}
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current = current->getFirstDependency();
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}
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plan->insertDependency(insertPoint, inspectNode);
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}
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gatherNode->elements(thisSortNode->elements());

‎tests/js/server/aql/aql-optimizer-rule-late-document-materialization-arangosearch.inc‎

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@@ -380,6 +380,34 @@
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});
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assertEqual(0, expected.size);
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},
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testConstrainedSortOnDbServer() {
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let query = "FOR d IN " + vn + " SEARCH d.value > 9 SORT BM25(d) LIMIT 10 RETURN {key: d._key, value: d.value}";
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let plan = AQL_EXPLAIN(query).plan;
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assertNotEqual(-1, plan.rules.indexOf(ruleName));
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let materializeNodeFound = false;
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let nodeDependency = null;
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plan.nodes.forEach(function(node) {
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if( node.type === "MaterializeNode") {
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assertFalse(materializeNodeFound);
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// FIXME: temporary relaxed assertion
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// We need to fix node placement in oneshard mode
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// first. And than we indeed will get expected node placement
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// assertEqual(nodeDependency.type, isCluster ? "SortNode" : "LimitNode");
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assertTrue(nodeDependency.type === "SortNode" || nodeDependency.type === "LimitNode");
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materializeNodeFound = true;
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}
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nodeDependency = node;
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});
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assertTrue(materializeNodeFound);
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let result = AQL_EXECUTE(query);
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assertEqual(4, result.json.length);
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let expected = new Set(['c_0', 'c_1', 'c_2', 'c_3']);
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result.json.forEach(function(doc) {
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assertTrue(expected.has(doc.key));
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expected.delete(doc.key);
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});
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assertEqual(0, expected.size);
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}
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};
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};
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}());

‎tests/js/server/aql/aql-optimizer-rule-late-document-materialization.js‎

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@@ -607,6 +607,31 @@ function lateDocumentMaterializationRuleTestSuite () {
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let result = AQL_EXECUTE(query);
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assertEqual(1, result.json.length);
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assertEqual(result.json[0]._key, 'c0');
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},
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testConstrainedSortOnDbServer() {
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let query = "FOR d IN " + prefixIndexCollectionName + " FILTER d.obj.b == {sb: 'b_val_0'} " +
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"SORT d.obj.b LIMIT 10 RETURN {key: d._key, value: d.some_value_from_doc}";
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let plan = AQL_EXPLAIN(query).plan;
615+
assertNotEqual(-1, plan.rules.indexOf(ruleName));
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let materializeNodeFound = false;
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let nodeDependency = null;
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plan.nodes.forEach(function(node) {
619+
if( node.type === "MaterializeNode") {
620+
assertFalse(materializeNodeFound);
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assertEqual(nodeDependency.type, isCluster ? "SortNode" : "LimitNode");
622+
materializeNodeFound = true;
623+
}
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nodeDependency = node;
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});
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assertTrue(materializeNodeFound);
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let result = AQL_EXECUTE(query);
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assertEqual(1, result.json.length);
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let expected = new Set(['c0']);
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result.json.forEach(function(doc) {
631+
assertTrue(expected.has(doc.key));
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expected.delete(doc.key);
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});
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assertEqual(0, expected.size);
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}
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};
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}

‎tests/js/server/aql/aql-queries-optimizer-limit-cluster.js‎

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Original file line numberDiff line numberDiff line change
@@ -601,7 +601,17 @@ function ahuacatlQueryOptimizerLimitTestSuite () {
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var actual = getQueryResults(query);
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assertEqual(0, actual.length);
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assertEqual([ "SingletonNode", "EnumerateCollectionNode", "CalculationNode", "CalculationNode", "SortNode", "RemoteNode", "GatherNode", "LimitNode", "FilterNode", "ReturnNode" ], explain(query));
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assertEqual([ "SingletonNode", "EnumerateCollectionNode", "CalculationNode", "SortNode", "CalculationNode",
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"RemoteNode", "GatherNode", "LimitNode", "FilterNode", "ReturnNode" ], explain(query));
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},
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testLimitFullCollectionSort3_DoubleCalculation : function () {
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var query = "FOR c IN " + cn + " SORT c.value LIMIT 0, 10 FILTER c.value >= 20 && c.value < 30 RETURN c.value2";
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var actual = getQueryResults(query);
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assertEqual(0, actual.length);
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assertEqual([ "SingletonNode", "EnumerateCollectionNode", "CalculationNode", "SortNode", "CalculationNode",
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"CalculationNode", "RemoteNode", "GatherNode", "LimitNode", "FilterNode", "ReturnNode" ], explain(query));
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},
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////////////////////////////////////////////////////////////////////////////////

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