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Posted to commits@pinot.apache.org by "ankitsultana (via GitHub)" <gi...@apache.org> on 2023/04/06 22:18:32 UTC
[GitHub] [pinot] ankitsultana commented on a diff in pull request #10570: [multistage] Split MailboxReceiveOperator into sorted and non-sorted versions
ankitsultana commented on code in PR #10570:
URL: https://github.com/apache/pinot/pull/10570#discussion_r1160297389
##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/operator/SortedMailboxReceiveOperator.java:
##########
@@ -0,0 +1,189 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pinot.query.runtime.operator;
+
+import com.google.common.base.Preconditions;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.PriorityQueue;
+import javax.annotation.Nullable;
+import org.apache.calcite.rel.RelDistribution;
+import org.apache.calcite.rel.RelFieldCollation;
+import org.apache.commons.collections.CollectionUtils;
+import org.apache.pinot.common.datablock.DataBlock;
+import org.apache.pinot.common.exception.QueryException;
+import org.apache.pinot.common.utils.DataSchema;
+import org.apache.pinot.query.mailbox.MailboxIdentifier;
+import org.apache.pinot.query.mailbox.ReceivingMailbox;
+import org.apache.pinot.query.planner.logical.RexExpression;
+import org.apache.pinot.query.routing.VirtualServer;
+import org.apache.pinot.query.runtime.blocks.TransferableBlock;
+import org.apache.pinot.query.runtime.blocks.TransferableBlockUtils;
+import org.apache.pinot.query.runtime.operator.utils.SortUtils;
+import org.apache.pinot.query.runtime.plan.OpChainExecutionContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+/**
+ * This {@code SortedMailboxReceiveOperator} receives data from a {@link ReceivingMailbox} and serve it out from the
+ * {@link MultiStageOperator#getNextBlock()}()} API in a sorted manner.
+ *
+ * TODO: Once sorting on the {@code MailboxSendOperator} is available, modify this to use a k-way merge instead of
+ * resorting via the PriorityQueue.
+ */
+public class SortedMailboxReceiveOperator extends BaseMailboxReceiveOperator {
+ private static final Logger LOGGER = LoggerFactory.getLogger(SortedMailboxReceiveOperator.class);
+ private static final String EXPLAIN_NAME = "SORTED_MAILBOX_RECEIVE";
+
+ private final List<RexExpression> _collationKeys;
+ private final List<RelFieldCollation.Direction> _collationDirections;
+ private final boolean _isSortOnSender;
+ private final boolean _isSortOnReceiver;
+ private final DataSchema _dataSchema;
+ private final PriorityQueue<Object[]> _priorityQueue;
+ private boolean _isSortedBlockConstructed;
+
+ public SortedMailboxReceiveOperator(OpChainExecutionContext context, RelDistribution.Type exchangeType,
+ List<RexExpression> collationKeys, List<RelFieldCollation.Direction> collationDirections, boolean isSortOnSender,
+ boolean isSortOnReceiver, DataSchema dataSchema, int senderStageId, int receiverStageId) {
+ this(context, context.getMetadataMap().get(senderStageId).getServerInstances(), exchangeType, collationKeys,
+ collationDirections, isSortOnSender, isSortOnReceiver, dataSchema, senderStageId,
+ receiverStageId, context.getTimeoutMs());
+ }
+
+ // TODO: Move deadlineInNanoSeconds to OperatorContext.
+ // TODO: Remove boxed timeoutMs value from here and use long deadlineMs from context.
+ public SortedMailboxReceiveOperator(OpChainExecutionContext context, List<VirtualServer> sendingStageInstances,
+ RelDistribution.Type exchangeType, List<RexExpression> collationKeys,
+ List<RelFieldCollation.Direction> collationDirections, boolean isSortOnSender, boolean isSortOnReceiver,
+ DataSchema dataSchema, int senderStageId, int receiverStageId, Long timeoutMs) {
+ super(context, sendingStageInstances, exchangeType, senderStageId, receiverStageId, timeoutMs);
+ _collationKeys = collationKeys;
+ _collationDirections = collationDirections;
+ _isSortOnSender = isSortOnSender;
+ _isSortOnReceiver = isSortOnReceiver;
+ _dataSchema = dataSchema;
+ Preconditions.checkState(!CollectionUtils.isEmpty(collationKeys) && isSortOnReceiver,
+ "Collation keys should exist and sorting must be enabled otherwise use non-sorted MailboxReceiveOperator");
+ _priorityQueue = new PriorityQueue<>(new SortUtils.SortComparator(collationKeys, collationDirections,
+ dataSchema, false));
+ _isSortedBlockConstructed = false;
+ }
+
+ @Nullable
+ @Override
+ public String toExplainString() {
+ return EXPLAIN_NAME;
+ }
+
+ @Override
+ protected TransferableBlock getNextBlock() {
+ if (_upstreamErrorBlock != null) {
+ cleanUpResourcesOnError();
Review Comment:
Can we do all clean-up in the cancel/close calls?
##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/plan/PhysicalPlanVisitor.java:
##########
@@ -61,12 +63,20 @@ public static OpChain build(StageNode node, PlanRequestContext context) {
@Override
public MultiStageOperator visitMailboxReceive(MailboxReceiveNode node, PlanRequestContext context) {
- MailboxReceiveOperator mailboxReceiveOperator =
- new MailboxReceiveOperator(context.getOpChainExecutionContext(), node.getExchangeType(),
- node.getCollationKeys(), node.getCollationDirections(), node.isSortOnSender(), node.isSortOnReceiver(),
- node.getDataSchema(), node.getSenderStageId(), node.getStageId());
- context.addReceivingMailboxes(mailboxReceiveOperator.getSendingMailbox());
- return mailboxReceiveOperator;
+ if (!CollectionUtils.isEmpty(node.getCollationKeys()) && node.isSortOnReceiver()) {
Review Comment:
Is there a case where `node.isSortOnReceiver()` is true but collation keys are empty?
##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/operator/SortedMailboxReceiveOperator.java:
##########
@@ -0,0 +1,189 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pinot.query.runtime.operator;
+
+import com.google.common.base.Preconditions;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.PriorityQueue;
+import javax.annotation.Nullable;
+import org.apache.calcite.rel.RelDistribution;
+import org.apache.calcite.rel.RelFieldCollation;
+import org.apache.commons.collections.CollectionUtils;
+import org.apache.pinot.common.datablock.DataBlock;
+import org.apache.pinot.common.exception.QueryException;
+import org.apache.pinot.common.utils.DataSchema;
+import org.apache.pinot.query.mailbox.MailboxIdentifier;
+import org.apache.pinot.query.mailbox.ReceivingMailbox;
+import org.apache.pinot.query.planner.logical.RexExpression;
+import org.apache.pinot.query.routing.VirtualServer;
+import org.apache.pinot.query.runtime.blocks.TransferableBlock;
+import org.apache.pinot.query.runtime.blocks.TransferableBlockUtils;
+import org.apache.pinot.query.runtime.operator.utils.SortUtils;
+import org.apache.pinot.query.runtime.plan.OpChainExecutionContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+/**
+ * This {@code SortedMailboxReceiveOperator} receives data from a {@link ReceivingMailbox} and serve it out from the
+ * {@link MultiStageOperator#getNextBlock()}()} API in a sorted manner.
+ *
+ * TODO: Once sorting on the {@code MailboxSendOperator} is available, modify this to use a k-way merge instead of
+ * resorting via the PriorityQueue.
+ */
+public class SortedMailboxReceiveOperator extends BaseMailboxReceiveOperator {
+ private static final Logger LOGGER = LoggerFactory.getLogger(SortedMailboxReceiveOperator.class);
+ private static final String EXPLAIN_NAME = "SORTED_MAILBOX_RECEIVE";
+
+ private final List<RexExpression> _collationKeys;
+ private final List<RelFieldCollation.Direction> _collationDirections;
+ private final boolean _isSortOnSender;
+ private final boolean _isSortOnReceiver;
+ private final DataSchema _dataSchema;
+ private final PriorityQueue<Object[]> _priorityQueue;
+ private boolean _isSortedBlockConstructed;
+
+ public SortedMailboxReceiveOperator(OpChainExecutionContext context, RelDistribution.Type exchangeType,
+ List<RexExpression> collationKeys, List<RelFieldCollation.Direction> collationDirections, boolean isSortOnSender,
+ boolean isSortOnReceiver, DataSchema dataSchema, int senderStageId, int receiverStageId) {
+ this(context, context.getMetadataMap().get(senderStageId).getServerInstances(), exchangeType, collationKeys,
+ collationDirections, isSortOnSender, isSortOnReceiver, dataSchema, senderStageId,
+ receiverStageId, context.getTimeoutMs());
+ }
+
+ // TODO: Move deadlineInNanoSeconds to OperatorContext.
+ // TODO: Remove boxed timeoutMs value from here and use long deadlineMs from context.
+ public SortedMailboxReceiveOperator(OpChainExecutionContext context, List<VirtualServer> sendingStageInstances,
+ RelDistribution.Type exchangeType, List<RexExpression> collationKeys,
+ List<RelFieldCollation.Direction> collationDirections, boolean isSortOnSender, boolean isSortOnReceiver,
+ DataSchema dataSchema, int senderStageId, int receiverStageId, Long timeoutMs) {
+ super(context, sendingStageInstances, exchangeType, senderStageId, receiverStageId, timeoutMs);
+ _collationKeys = collationKeys;
+ _collationDirections = collationDirections;
+ _isSortOnSender = isSortOnSender;
+ _isSortOnReceiver = isSortOnReceiver;
+ _dataSchema = dataSchema;
+ Preconditions.checkState(!CollectionUtils.isEmpty(collationKeys) && isSortOnReceiver,
+ "Collation keys should exist and sorting must be enabled otherwise use non-sorted MailboxReceiveOperator");
+ _priorityQueue = new PriorityQueue<>(new SortUtils.SortComparator(collationKeys, collationDirections,
+ dataSchema, false));
+ _isSortedBlockConstructed = false;
+ }
+
+ @Nullable
+ @Override
+ public String toExplainString() {
+ return EXPLAIN_NAME;
+ }
+
+ @Override
+ protected TransferableBlock getNextBlock() {
+ if (_upstreamErrorBlock != null) {
+ cleanUpResourcesOnError();
+ return _upstreamErrorBlock;
+ } else if (System.nanoTime() >= _deadlineTimestampNano) {
+ return TransferableBlockUtils.getErrorTransferableBlock(QueryException.EXECUTION_TIMEOUT_ERROR);
+ }
+
+ int startingIdx = _serverIdx;
+ int openMailboxCount = 0;
+ int eosMailboxCount = 0;
+ boolean foundNonNullTransferableBlock;
+ // For all non-singleton distribution, we poll from every instance to check mailbox content.
+ // Since this operator needs to wait for all incoming data before it can send the data to the
+ // upstream operators, this operator will keep trying to poll from all mailboxes until it only
+ // receives null blocks or EOS for all mailboxes. This operator does not need to yield itself
+ // for backpressure at the moment but once support is added for k-way merge when input data is
+ // sorted this operator will have to return some data blocks without waiting for all the data.
+ // TODO: Fix wasted CPU cycles on waiting for servers that are not supposed to give content.
+ do {
+ // Reset the following for each loop
+ foundNonNullTransferableBlock = false;
+ openMailboxCount = 0;
+ eosMailboxCount = 0;
+ for (int i = 0; i < _sendingMailbox.size(); i++) {
+ // this implements a round-robin mailbox iterator, so we don't starve any mailboxes
+ _serverIdx = (startingIdx + i) % _sendingMailbox.size();
+ MailboxIdentifier mailboxId = _sendingMailbox.get(_serverIdx);
+ try {
+ ReceivingMailbox<TransferableBlock> mailbox = _mailboxService.getReceivingMailbox(mailboxId);
+ if (!mailbox.isClosed()) {
+ openMailboxCount++;
+ TransferableBlock block = mailbox.receive();
+ // Get null block when pulling times out from mailbox.
+ if (block != null) {
+ foundNonNullTransferableBlock = true;
+ if (block.isErrorBlock()) {
+ cleanUpResourcesOnError();
+ _upstreamErrorBlock =
+ TransferableBlockUtils.getErrorTransferableBlock(block.getDataBlock().getExceptions());
+ return _upstreamErrorBlock;
+ }
+ if (!block.isEndOfStreamBlock()) {
+ // Add rows to the PriorityQueue to order them
+ List<Object[]> container = block.getContainer();
+ _priorityQueue.addAll(container);
+ } else {
+ if (_opChainStats != null && !block.getResultMetadata().isEmpty()) {
+ for (Map.Entry<String, OperatorStats> entry : block.getResultMetadata().entrySet()) {
+ _opChainStats.getOperatorStatsMap().compute(entry.getKey(), (_key, _value) -> entry.getValue());
+ }
+ }
+ eosMailboxCount++;
+ }
+ }
+ }
+ } catch (Exception e) {
+ return TransferableBlockUtils.getErrorTransferableBlock(
+ new RuntimeException(String.format("Error polling mailbox=%s", mailboxId), e));
+ }
+ }
+ } while (foundNonNullTransferableBlock && ((openMailboxCount > 0) && (openMailboxCount > eosMailboxCount)));
+
+ if (((openMailboxCount == 0) || (openMailboxCount <= eosMailboxCount))
Review Comment:
nit: I think changing the second condition to `openMailboxCount == eosMailboxCount` would be more readable, since openMailboxCount will never be less than eosMailboxCount.
##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/operator/SortedMailboxReceiveOperator.java:
##########
@@ -0,0 +1,189 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pinot.query.runtime.operator;
+
+import com.google.common.base.Preconditions;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.PriorityQueue;
+import javax.annotation.Nullable;
+import org.apache.calcite.rel.RelDistribution;
+import org.apache.calcite.rel.RelFieldCollation;
+import org.apache.commons.collections.CollectionUtils;
+import org.apache.pinot.common.datablock.DataBlock;
+import org.apache.pinot.common.exception.QueryException;
+import org.apache.pinot.common.utils.DataSchema;
+import org.apache.pinot.query.mailbox.MailboxIdentifier;
+import org.apache.pinot.query.mailbox.ReceivingMailbox;
+import org.apache.pinot.query.planner.logical.RexExpression;
+import org.apache.pinot.query.routing.VirtualServer;
+import org.apache.pinot.query.runtime.blocks.TransferableBlock;
+import org.apache.pinot.query.runtime.blocks.TransferableBlockUtils;
+import org.apache.pinot.query.runtime.operator.utils.SortUtils;
+import org.apache.pinot.query.runtime.plan.OpChainExecutionContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+/**
+ * This {@code SortedMailboxReceiveOperator} receives data from a {@link ReceivingMailbox} and serve it out from the
+ * {@link MultiStageOperator#getNextBlock()}()} API in a sorted manner.
+ *
+ * TODO: Once sorting on the {@code MailboxSendOperator} is available, modify this to use a k-way merge instead of
+ * resorting via the PriorityQueue.
+ */
+public class SortedMailboxReceiveOperator extends BaseMailboxReceiveOperator {
+ private static final Logger LOGGER = LoggerFactory.getLogger(SortedMailboxReceiveOperator.class);
+ private static final String EXPLAIN_NAME = "SORTED_MAILBOX_RECEIVE";
+
+ private final List<RexExpression> _collationKeys;
+ private final List<RelFieldCollation.Direction> _collationDirections;
+ private final boolean _isSortOnSender;
+ private final boolean _isSortOnReceiver;
+ private final DataSchema _dataSchema;
+ private final PriorityQueue<Object[]> _priorityQueue;
+ private boolean _isSortedBlockConstructed;
+
+ public SortedMailboxReceiveOperator(OpChainExecutionContext context, RelDistribution.Type exchangeType,
+ List<RexExpression> collationKeys, List<RelFieldCollation.Direction> collationDirections, boolean isSortOnSender,
+ boolean isSortOnReceiver, DataSchema dataSchema, int senderStageId, int receiverStageId) {
+ this(context, context.getMetadataMap().get(senderStageId).getServerInstances(), exchangeType, collationKeys,
+ collationDirections, isSortOnSender, isSortOnReceiver, dataSchema, senderStageId,
+ receiverStageId, context.getTimeoutMs());
+ }
+
+ // TODO: Move deadlineInNanoSeconds to OperatorContext.
+ // TODO: Remove boxed timeoutMs value from here and use long deadlineMs from context.
+ public SortedMailboxReceiveOperator(OpChainExecutionContext context, List<VirtualServer> sendingStageInstances,
+ RelDistribution.Type exchangeType, List<RexExpression> collationKeys,
+ List<RelFieldCollation.Direction> collationDirections, boolean isSortOnSender, boolean isSortOnReceiver,
+ DataSchema dataSchema, int senderStageId, int receiverStageId, Long timeoutMs) {
+ super(context, sendingStageInstances, exchangeType, senderStageId, receiverStageId, timeoutMs);
+ _collationKeys = collationKeys;
+ _collationDirections = collationDirections;
+ _isSortOnSender = isSortOnSender;
+ _isSortOnReceiver = isSortOnReceiver;
+ _dataSchema = dataSchema;
+ Preconditions.checkState(!CollectionUtils.isEmpty(collationKeys) && isSortOnReceiver,
+ "Collation keys should exist and sorting must be enabled otherwise use non-sorted MailboxReceiveOperator");
+ _priorityQueue = new PriorityQueue<>(new SortUtils.SortComparator(collationKeys, collationDirections,
+ dataSchema, false));
+ _isSortedBlockConstructed = false;
+ }
+
+ @Nullable
+ @Override
+ public String toExplainString() {
+ return EXPLAIN_NAME;
+ }
+
+ @Override
+ protected TransferableBlock getNextBlock() {
+ if (_upstreamErrorBlock != null) {
+ cleanUpResourcesOnError();
+ return _upstreamErrorBlock;
+ } else if (System.nanoTime() >= _deadlineTimestampNano) {
+ return TransferableBlockUtils.getErrorTransferableBlock(QueryException.EXECUTION_TIMEOUT_ERROR);
+ }
+
+ int startingIdx = _serverIdx;
+ int openMailboxCount = 0;
+ int eosMailboxCount = 0;
+ boolean foundNonNullTransferableBlock;
+ // For all non-singleton distribution, we poll from every instance to check mailbox content.
+ // Since this operator needs to wait for all incoming data before it can send the data to the
+ // upstream operators, this operator will keep trying to poll from all mailboxes until it only
+ // receives null blocks or EOS for all mailboxes. This operator does not need to yield itself
+ // for backpressure at the moment but once support is added for k-way merge when input data is
+ // sorted this operator will have to return some data blocks without waiting for all the data.
+ // TODO: Fix wasted CPU cycles on waiting for servers that are not supposed to give content.
+ do {
+ // Reset the following for each loop
+ foundNonNullTransferableBlock = false;
+ openMailboxCount = 0;
+ eosMailboxCount = 0;
+ for (int i = 0; i < _sendingMailbox.size(); i++) {
+ // this implements a round-robin mailbox iterator, so we don't starve any mailboxes
+ _serverIdx = (startingIdx + i) % _sendingMailbox.size();
+ MailboxIdentifier mailboxId = _sendingMailbox.get(_serverIdx);
+ try {
+ ReceivingMailbox<TransferableBlock> mailbox = _mailboxService.getReceivingMailbox(mailboxId);
+ if (!mailbox.isClosed()) {
+ openMailboxCount++;
+ TransferableBlock block = mailbox.receive();
+ // Get null block when pulling times out from mailbox.
+ if (block != null) {
+ foundNonNullTransferableBlock = true;
+ if (block.isErrorBlock()) {
+ cleanUpResourcesOnError();
+ _upstreamErrorBlock =
+ TransferableBlockUtils.getErrorTransferableBlock(block.getDataBlock().getExceptions());
+ return _upstreamErrorBlock;
+ }
+ if (!block.isEndOfStreamBlock()) {
+ // Add rows to the PriorityQueue to order them
+ List<Object[]> container = block.getContainer();
+ _priorityQueue.addAll(container);
+ } else {
+ if (_opChainStats != null && !block.getResultMetadata().isEmpty()) {
+ for (Map.Entry<String, OperatorStats> entry : block.getResultMetadata().entrySet()) {
+ _opChainStats.getOperatorStatsMap().compute(entry.getKey(), (_key, _value) -> entry.getValue());
+ }
+ }
+ eosMailboxCount++;
+ }
+ }
+ }
+ } catch (Exception e) {
+ return TransferableBlockUtils.getErrorTransferableBlock(
+ new RuntimeException(String.format("Error polling mailbox=%s", mailboxId), e));
+ }
+ }
+ } while (foundNonNullTransferableBlock && ((openMailboxCount > 0) && (openMailboxCount > eosMailboxCount)));
+
+ if (((openMailboxCount == 0) || (openMailboxCount <= eosMailboxCount))
+ && (!CollectionUtils.isEmpty(_priorityQueue)) && !_isSortedBlockConstructed) {
+ // Some data is present in the PriorityQueue, these need to be sent upstream
+ LinkedList<Object[]> rows = new LinkedList<>();
Review Comment:
Should we use an `ArrayList`? I'd assume that would be faster than a `LinkedList`
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