Jackie-Jiang commented on code in PR #15261: URL: https://github.com/apache/pinot/pull/15261#discussion_r2010958163
########## pinot-core/src/main/java/org/apache/pinot/core/data/manager/realtime/ConsumerCoordinator.java: ########## @@ -0,0 +1,234 @@ +/** + * 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.core.data.manager.realtime; + +import com.google.common.annotations.VisibleForTesting; +import com.google.common.base.Preconditions; +import java.util.Map; +import java.util.concurrent.Semaphore; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.locks.Condition; +import java.util.concurrent.locks.Lock; +import java.util.concurrent.locks.ReentrantLock; +import javax.annotation.Nullable; +import org.apache.pinot.common.utils.LLCSegmentName; +import org.apache.pinot.common.utils.helix.HelixHelper; +import org.apache.pinot.segment.local.data.manager.SegmentDataManager; +import org.apache.pinot.spi.config.table.ingestion.StreamIngestionConfig; +import org.apache.pinot.spi.utils.CommonConstants; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +public class ConsumerCoordinator { + + private static final Logger LOGGER = LoggerFactory.getLogger(ConsumerCoordinator.class); + + private final Semaphore _semaphore; + private final boolean _enforceConsumptionInOrder; + private final Condition _condition; + private final Lock _lock; + private int _maxSegmentSeqNumLoaded = -1; + private boolean _relyOnIdealState = true; Review Comment: Should we remove this flag? Do we always want to rely on IS for the first CONSUMING segment, then rely on sequence id for the following segments? ########## pinot-common/src/main/java/org/apache/pinot/common/utils/helix/HelixHelper.java: ########## @@ -250,6 +250,13 @@ public static IdealState getTableIdealState(HelixManager manager, String resourc return accessor.getProperty(builder.idealStates(resourceName)); } + public static Map<String, Map<String, String>> getSegmentAssignment(String tableNameWithType, Review Comment: (minor) Suggest not adding this as a general util because: 1. We don't usually perform existence check in this util class 2. It is not very clear where the assignment from by the method name It would be more readable to perform the IS null check on the caller side ########## pinot-core/src/main/java/org/apache/pinot/core/data/manager/realtime/RealtimeTableDataManager.java: ########## @@ -802,6 +808,21 @@ private void registerSegment(String segmentName, SegmentDataManager segmentDataM registerSegment(segmentName, segmentDataManager); } + @Override + protected SegmentDataManager registerSegment(String segmentName, SegmentDataManager segmentDataManager) { + SegmentDataManager oldSegmentDataManager = super.registerSegment(segmentName, segmentDataManager); + if (_enforceConsumptionInOrder) { + // helix threads might be waiting for their respective previous segments to be loaded. + // they need to be notified here. + LLCSegmentName llcSegmentName = LLCSegmentName.of(segmentName); + Preconditions.checkNotNull(llcSegmentName); Review Comment: This will break uploaded segments which might not follow the LLC segment name format. We should skip these segments ########## pinot-core/src/main/java/org/apache/pinot/core/data/manager/realtime/ConsumerCoordinator.java: ########## @@ -0,0 +1,234 @@ +/** + * 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.core.data.manager.realtime; + +import com.google.common.annotations.VisibleForTesting; +import com.google.common.base.Preconditions; +import java.util.Map; +import java.util.concurrent.Semaphore; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.locks.Condition; +import java.util.concurrent.locks.Lock; +import java.util.concurrent.locks.ReentrantLock; +import javax.annotation.Nullable; +import org.apache.pinot.common.utils.LLCSegmentName; +import org.apache.pinot.common.utils.helix.HelixHelper; +import org.apache.pinot.segment.local.data.manager.SegmentDataManager; +import org.apache.pinot.spi.config.table.ingestion.StreamIngestionConfig; +import org.apache.pinot.spi.utils.CommonConstants; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +public class ConsumerCoordinator { + + private static final Logger LOGGER = LoggerFactory.getLogger(ConsumerCoordinator.class); + + private final Semaphore _semaphore; + private final boolean _enforceConsumptionInOrder; + private final Condition _condition; + private final Lock _lock; + private int _maxSegmentSeqNumLoaded = -1; + private boolean _relyOnIdealState = true; + private final RealtimeTableDataManager _realtimeTableDataManager; + private final AtomicBoolean _isFirstTransitionProcessed; + + public ConsumerCoordinator(boolean enforceConsumptionInOrder, RealtimeTableDataManager realtimeTableDataManager) { + _semaphore = new Semaphore(1); + _lock = new ReentrantLock(); + _condition = _lock.newCondition(); + _enforceConsumptionInOrder = enforceConsumptionInOrder; + _realtimeTableDataManager = realtimeTableDataManager; + StreamIngestionConfig streamIngestionConfig = realtimeTableDataManager.getStreamIngestionConfig(); + boolean trackSegmentSeqNumber = false; + if (streamIngestionConfig != null) { + trackSegmentSeqNumber = streamIngestionConfig.isTrackSegmentSeqNumber(); + } + // if trackSegmentSeqNumber is false, server relies on ideal state to fetch previous segment to a segment. + if (trackSegmentSeqNumber) { + _relyOnIdealState = false; + } + _isFirstTransitionProcessed = new AtomicBoolean(false); + } + + void acquire(LLCSegmentName llcSegmentName) + throws InterruptedException { + + if (_enforceConsumptionInOrder) { + waitForPrevSegment(llcSegmentName); + } + + long startTimeMs = System.currentTimeMillis(); + while (!_semaphore.tryAcquire(5, TimeUnit.MINUTES)) { + LOGGER.warn("Failed to acquire partitionGroup consumer semaphore in: {} ms. Retrying.", + System.currentTimeMillis() - startTimeMs); + } + } + + void release() { + _semaphore.release(); + } + + @VisibleForTesting + Semaphore getSemaphore() { + return _semaphore; + } + + void trackSegment(LLCSegmentName llcSegmentName) { + _lock.lock(); + try { + if (!_relyOnIdealState) { + _maxSegmentSeqNumLoaded = Math.max(_maxSegmentSeqNumLoaded, llcSegmentName.getSequenceNumber()); + } + // notify all helix threads waiting for their offline -> consuming segment's prev segment to be loaded + _condition.signalAll(); + } finally { + _lock.unlock(); + } + } + + private void waitForPrevSegment(LLCSegmentName currSegment) + throws InterruptedException { + + long startTimeMs = System.currentTimeMillis(); + + if ((_relyOnIdealState) || (!_isFirstTransitionProcessed.get())) { + // if _relyOnIdealState or no offline -> consuming transition has been processed, it means rely on + // ideal state to fetch previous segment. + String previousSegment = getPreviousSegment(currSegment); + if (previousSegment == null) { + // previous segment can only be null if either all the previous segments are deleted or this is the starting + // sequence segment of the partition Group. + return; + } + + SegmentDataManager segmentDataManager = _realtimeTableDataManager.acquireSegment(previousSegment); + try { + _lock.lock(); + while (segmentDataManager == null) { + // if segmentDataManager == null, it means segment is not loaded in the server. + // wait until it's loaded. + while (!_condition.await(5, TimeUnit.MINUTES)) { + LOGGER.warn("Semaphore access denied to segment: {}. Waiting on previous segment: {} since: {} ms.", + currSegment.getSegmentName(), previousSegment, System.currentTimeMillis() - startTimeMs); + } + segmentDataManager = _realtimeTableDataManager.acquireSegment(previousSegment); + } + } finally { + _lock.unlock(); + if (segmentDataManager != null) { + _realtimeTableDataManager.releaseSegment(segmentDataManager); + } + } + + // the first transition will always be prone to error, consider edge case where segment previous to current + // helix transition's segment was deleted and this server came alive after successful deletion. the prev + // segment will not exist, hence first transition is handled using isFirstTransitionSuccessful. + _isFirstTransitionProcessed.compareAndSet(false, true); + return; + } + + int prevSeqNum = currSegment.getSequenceNumber() - 1; + _lock.lock(); + try { + while (_maxSegmentSeqNumLoaded < prevSeqNum) { + // it means all segments until _maxSegmentSeqNumLoaded is not loaded in the server. Wait until it's loaded. + while (!_condition.await(5, TimeUnit.MINUTES)) { + LOGGER.warn("Semaphore access denied to segment: {}." + + " Waiting on previous segment with sequence number: {} since: {} ms.", currSegment.getSegmentName(), + prevSeqNum, System.currentTimeMillis() - startTimeMs); + } + } + } finally { + _lock.unlock(); + } + } + + @VisibleForTesting + @Nullable + String getPreviousSegment(LLCSegmentName currSegment) { + // if seq num of current segment is 102, maxSequenceNumBelowCurrentSegment must be highest seq num of any segment + // created before current segment + int maxSequenceNumBelowCurrentSegment = -1; + String previousSegment = null; + int currPartitionGroupId = currSegment.getPartitionGroupId(); + int currSequenceNum = currSegment.getSequenceNumber(); + + Map<String, Map<String, String>> segmentAssignment = getSegmentAssignment(); + + if (segmentAssignment == null) { + return null; + } + + for (Map.Entry<String, Map<String, String>> entry : segmentAssignment.entrySet()) { + String segmentName = entry.getKey(); + Map<String, String> instanceStateMap = entry.getValue(); + + if (!instanceStateMap.containsValue(CommonConstants.Helix.StateModel.SegmentStateModel.ONLINE)) { + // if server is looking for previous segment to current transition's segment, it means the previous segment + // has to be online in any instance. If all previous segments are not online, we just allow the current helix + // transition to go ahead. + continue; + } + + LLCSegmentName llcSegmentName = LLCSegmentName.of(segmentName); + Preconditions.checkNotNull(llcSegmentName); Review Comment: Skip the segments not following the LLC naming convention ########## pinot-core/src/main/java/org/apache/pinot/core/data/manager/realtime/ConsumerCoordinator.java: ########## @@ -0,0 +1,234 @@ +/** + * 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.core.data.manager.realtime; + +import com.google.common.annotations.VisibleForTesting; +import com.google.common.base.Preconditions; +import java.util.Map; +import java.util.concurrent.Semaphore; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.locks.Condition; +import java.util.concurrent.locks.Lock; +import java.util.concurrent.locks.ReentrantLock; +import javax.annotation.Nullable; +import org.apache.pinot.common.utils.LLCSegmentName; +import org.apache.pinot.common.utils.helix.HelixHelper; +import org.apache.pinot.segment.local.data.manager.SegmentDataManager; +import org.apache.pinot.spi.config.table.ingestion.StreamIngestionConfig; +import org.apache.pinot.spi.utils.CommonConstants; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +public class ConsumerCoordinator { + + private static final Logger LOGGER = LoggerFactory.getLogger(ConsumerCoordinator.class); + + private final Semaphore _semaphore; + private final boolean _enforceConsumptionInOrder; + private final Condition _condition; + private final Lock _lock; + private int _maxSegmentSeqNumLoaded = -1; + private boolean _relyOnIdealState = true; + private final RealtimeTableDataManager _realtimeTableDataManager; + private final AtomicBoolean _isFirstTransitionProcessed; + + public ConsumerCoordinator(boolean enforceConsumptionInOrder, RealtimeTableDataManager realtimeTableDataManager) { + _semaphore = new Semaphore(1); + _lock = new ReentrantLock(); + _condition = _lock.newCondition(); + _enforceConsumptionInOrder = enforceConsumptionInOrder; + _realtimeTableDataManager = realtimeTableDataManager; + StreamIngestionConfig streamIngestionConfig = realtimeTableDataManager.getStreamIngestionConfig(); + boolean trackSegmentSeqNumber = false; + if (streamIngestionConfig != null) { + trackSegmentSeqNumber = streamIngestionConfig.isTrackSegmentSeqNumber(); + } + // if trackSegmentSeqNumber is false, server relies on ideal state to fetch previous segment to a segment. + if (trackSegmentSeqNumber) { + _relyOnIdealState = false; + } + _isFirstTransitionProcessed = new AtomicBoolean(false); + } + + void acquire(LLCSegmentName llcSegmentName) + throws InterruptedException { + + if (_enforceConsumptionInOrder) { + waitForPrevSegment(llcSegmentName); + } + + long startTimeMs = System.currentTimeMillis(); + while (!_semaphore.tryAcquire(5, TimeUnit.MINUTES)) { + LOGGER.warn("Failed to acquire partitionGroup consumer semaphore in: {} ms. Retrying.", + System.currentTimeMillis() - startTimeMs); + } + } + + void release() { + _semaphore.release(); + } + + @VisibleForTesting + Semaphore getSemaphore() { + return _semaphore; + } + + void trackSegment(LLCSegmentName llcSegmentName) { + _lock.lock(); + try { + if (!_relyOnIdealState) { + _maxSegmentSeqNumLoaded = Math.max(_maxSegmentSeqNumLoaded, llcSegmentName.getSequenceNumber()); + } + // notify all helix threads waiting for their offline -> consuming segment's prev segment to be loaded + _condition.signalAll(); + } finally { + _lock.unlock(); + } + } + + private void waitForPrevSegment(LLCSegmentName currSegment) + throws InterruptedException { + + long startTimeMs = System.currentTimeMillis(); + + if ((_relyOnIdealState) || (!_isFirstTransitionProcessed.get())) { + // if _relyOnIdealState or no offline -> consuming transition has been processed, it means rely on + // ideal state to fetch previous segment. + String previousSegment = getPreviousSegment(currSegment); + if (previousSegment == null) { + // previous segment can only be null if either all the previous segments are deleted or this is the starting + // sequence segment of the partition Group. + return; + } + + SegmentDataManager segmentDataManager = _realtimeTableDataManager.acquireSegment(previousSegment); + try { + _lock.lock(); + while (segmentDataManager == null) { + // if segmentDataManager == null, it means segment is not loaded in the server. + // wait until it's loaded. + while (!_condition.await(5, TimeUnit.MINUTES)) { + LOGGER.warn("Semaphore access denied to segment: {}. Waiting on previous segment: {} since: {} ms.", + currSegment.getSegmentName(), previousSegment, System.currentTimeMillis() - startTimeMs); + } + segmentDataManager = _realtimeTableDataManager.acquireSegment(previousSegment); + } + } finally { + _lock.unlock(); + if (segmentDataManager != null) { + _realtimeTableDataManager.releaseSegment(segmentDataManager); + } + } + + // the first transition will always be prone to error, consider edge case where segment previous to current + // helix transition's segment was deleted and this server came alive after successful deletion. the prev + // segment will not exist, hence first transition is handled using isFirstTransitionSuccessful. + _isFirstTransitionProcessed.compareAndSet(false, true); + return; + } + + int prevSeqNum = currSegment.getSequenceNumber() - 1; + _lock.lock(); + try { + while (_maxSegmentSeqNumLoaded < prevSeqNum) { + // it means all segments until _maxSegmentSeqNumLoaded is not loaded in the server. Wait until it's loaded. + while (!_condition.await(5, TimeUnit.MINUTES)) { + LOGGER.warn("Semaphore access denied to segment: {}." + + " Waiting on previous segment with sequence number: {} since: {} ms.", currSegment.getSegmentName(), + prevSeqNum, System.currentTimeMillis() - startTimeMs); + } + } + } finally { + _lock.unlock(); + } + } + + @VisibleForTesting + @Nullable + String getPreviousSegment(LLCSegmentName currSegment) { Review Comment: For the first state transition, checking only the previous segment is not really enough. Currently we rely on the start-up check to ensure all segments loaded, so we can skip the first state transition check. We can revisit this when trying to solve the rebalance problem ########## pinot-core/src/main/java/org/apache/pinot/core/data/manager/realtime/ConsumerCoordinator.java: ########## @@ -0,0 +1,234 @@ +/** + * 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.core.data.manager.realtime; + +import com.google.common.annotations.VisibleForTesting; +import com.google.common.base.Preconditions; +import java.util.Map; +import java.util.concurrent.Semaphore; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.locks.Condition; +import java.util.concurrent.locks.Lock; +import java.util.concurrent.locks.ReentrantLock; +import javax.annotation.Nullable; +import org.apache.pinot.common.utils.LLCSegmentName; +import org.apache.pinot.common.utils.helix.HelixHelper; +import org.apache.pinot.segment.local.data.manager.SegmentDataManager; +import org.apache.pinot.spi.config.table.ingestion.StreamIngestionConfig; +import org.apache.pinot.spi.utils.CommonConstants; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +public class ConsumerCoordinator { + + private static final Logger LOGGER = LoggerFactory.getLogger(ConsumerCoordinator.class); + + private final Semaphore _semaphore; + private final boolean _enforceConsumptionInOrder; + private final Condition _condition; + private final Lock _lock; + private int _maxSegmentSeqNumLoaded = -1; + private boolean _relyOnIdealState = true; + private final RealtimeTableDataManager _realtimeTableDataManager; + private final AtomicBoolean _isFirstTransitionProcessed; + + public ConsumerCoordinator(boolean enforceConsumptionInOrder, RealtimeTableDataManager realtimeTableDataManager) { + _semaphore = new Semaphore(1); + _lock = new ReentrantLock(); + _condition = _lock.newCondition(); + _enforceConsumptionInOrder = enforceConsumptionInOrder; + _realtimeTableDataManager = realtimeTableDataManager; + StreamIngestionConfig streamIngestionConfig = realtimeTableDataManager.getStreamIngestionConfig(); + boolean trackSegmentSeqNumber = false; + if (streamIngestionConfig != null) { + trackSegmentSeqNumber = streamIngestionConfig.isTrackSegmentSeqNumber(); + } + // if trackSegmentSeqNumber is false, server relies on ideal state to fetch previous segment to a segment. + if (trackSegmentSeqNumber) { + _relyOnIdealState = false; + } + _isFirstTransitionProcessed = new AtomicBoolean(false); + } + + void acquire(LLCSegmentName llcSegmentName) + throws InterruptedException { + + if (_enforceConsumptionInOrder) { + waitForPrevSegment(llcSegmentName); + } + + long startTimeMs = System.currentTimeMillis(); + while (!_semaphore.tryAcquire(5, TimeUnit.MINUTES)) { + LOGGER.warn("Failed to acquire partitionGroup consumer semaphore in: {} ms. Retrying.", + System.currentTimeMillis() - startTimeMs); + } + } + + void release() { + _semaphore.release(); + } + + @VisibleForTesting + Semaphore getSemaphore() { + return _semaphore; + } + + void trackSegment(LLCSegmentName llcSegmentName) { + _lock.lock(); + try { + if (!_relyOnIdealState) { + _maxSegmentSeqNumLoaded = Math.max(_maxSegmentSeqNumLoaded, llcSegmentName.getSequenceNumber()); + } + // notify all helix threads waiting for their offline -> consuming segment's prev segment to be loaded + _condition.signalAll(); + } finally { + _lock.unlock(); + } + } + + private void waitForPrevSegment(LLCSegmentName currSegment) + throws InterruptedException { + + long startTimeMs = System.currentTimeMillis(); + + if ((_relyOnIdealState) || (!_isFirstTransitionProcessed.get())) { + // if _relyOnIdealState or no offline -> consuming transition has been processed, it means rely on + // ideal state to fetch previous segment. + String previousSegment = getPreviousSegment(currSegment); + if (previousSegment == null) { + // previous segment can only be null if either all the previous segments are deleted or this is the starting + // sequence segment of the partition Group. + return; + } + + SegmentDataManager segmentDataManager = _realtimeTableDataManager.acquireSegment(previousSegment); + try { + _lock.lock(); + while (segmentDataManager == null) { + // if segmentDataManager == null, it means segment is not loaded in the server. + // wait until it's loaded. + while (!_condition.await(5, TimeUnit.MINUTES)) { + LOGGER.warn("Semaphore access denied to segment: {}. Waiting on previous segment: {} since: {} ms.", + currSegment.getSegmentName(), previousSegment, System.currentTimeMillis() - startTimeMs); + } + segmentDataManager = _realtimeTableDataManager.acquireSegment(previousSegment); + } + } finally { + _lock.unlock(); + if (segmentDataManager != null) { + _realtimeTableDataManager.releaseSegment(segmentDataManager); + } + } + + // the first transition will always be prone to error, consider edge case where segment previous to current + // helix transition's segment was deleted and this server came alive after successful deletion. the prev + // segment will not exist, hence first transition is handled using isFirstTransitionSuccessful. + _isFirstTransitionProcessed.compareAndSet(false, true); + return; + } + + int prevSeqNum = currSegment.getSequenceNumber() - 1; + _lock.lock(); + try { + while (_maxSegmentSeqNumLoaded < prevSeqNum) { + // it means all segments until _maxSegmentSeqNumLoaded is not loaded in the server. Wait until it's loaded. + while (!_condition.await(5, TimeUnit.MINUTES)) { + LOGGER.warn("Semaphore access denied to segment: {}." + + " Waiting on previous segment with sequence number: {} since: {} ms.", currSegment.getSegmentName(), + prevSeqNum, System.currentTimeMillis() - startTimeMs); + } + } + } finally { + _lock.unlock(); + } + } + + @VisibleForTesting + @Nullable + String getPreviousSegment(LLCSegmentName currSegment) { + // if seq num of current segment is 102, maxSequenceNumBelowCurrentSegment must be highest seq num of any segment + // created before current segment + int maxSequenceNumBelowCurrentSegment = -1; + String previousSegment = null; + int currPartitionGroupId = currSegment.getPartitionGroupId(); + int currSequenceNum = currSegment.getSequenceNumber(); + + Map<String, Map<String, String>> segmentAssignment = getSegmentAssignment(); + + if (segmentAssignment == null) { Review Comment: (minor) This will never be `null` ########## pinot-core/src/main/java/org/apache/pinot/core/data/manager/realtime/ConsumerCoordinator.java: ########## @@ -0,0 +1,234 @@ +/** + * 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.core.data.manager.realtime; + +import com.google.common.annotations.VisibleForTesting; +import com.google.common.base.Preconditions; +import java.util.Map; +import java.util.concurrent.Semaphore; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.locks.Condition; +import java.util.concurrent.locks.Lock; +import java.util.concurrent.locks.ReentrantLock; +import javax.annotation.Nullable; +import org.apache.pinot.common.utils.LLCSegmentName; +import org.apache.pinot.common.utils.helix.HelixHelper; +import org.apache.pinot.segment.local.data.manager.SegmentDataManager; +import org.apache.pinot.spi.config.table.ingestion.StreamIngestionConfig; +import org.apache.pinot.spi.utils.CommonConstants; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +public class ConsumerCoordinator { + + private static final Logger LOGGER = LoggerFactory.getLogger(ConsumerCoordinator.class); + + private final Semaphore _semaphore; + private final boolean _enforceConsumptionInOrder; + private final Condition _condition; + private final Lock _lock; + private int _maxSegmentSeqNumLoaded = -1; + private boolean _relyOnIdealState = true; + private final RealtimeTableDataManager _realtimeTableDataManager; + private final AtomicBoolean _isFirstTransitionProcessed; + + public ConsumerCoordinator(boolean enforceConsumptionInOrder, RealtimeTableDataManager realtimeTableDataManager) { + _semaphore = new Semaphore(1); + _lock = new ReentrantLock(); + _condition = _lock.newCondition(); + _enforceConsumptionInOrder = enforceConsumptionInOrder; + _realtimeTableDataManager = realtimeTableDataManager; + StreamIngestionConfig streamIngestionConfig = realtimeTableDataManager.getStreamIngestionConfig(); + boolean trackSegmentSeqNumber = false; + if (streamIngestionConfig != null) { + trackSegmentSeqNumber = streamIngestionConfig.isTrackSegmentSeqNumber(); + } + // if trackSegmentSeqNumber is false, server relies on ideal state to fetch previous segment to a segment. + if (trackSegmentSeqNumber) { + _relyOnIdealState = false; + } + _isFirstTransitionProcessed = new AtomicBoolean(false); + } + + void acquire(LLCSegmentName llcSegmentName) + throws InterruptedException { + + if (_enforceConsumptionInOrder) { + waitForPrevSegment(llcSegmentName); + } + + long startTimeMs = System.currentTimeMillis(); + while (!_semaphore.tryAcquire(5, TimeUnit.MINUTES)) { + LOGGER.warn("Failed to acquire partitionGroup consumer semaphore in: {} ms. Retrying.", + System.currentTimeMillis() - startTimeMs); + } + } + + void release() { + _semaphore.release(); + } + + @VisibleForTesting + Semaphore getSemaphore() { + return _semaphore; + } + + void trackSegment(LLCSegmentName llcSegmentName) { + _lock.lock(); + try { + if (!_relyOnIdealState) { + _maxSegmentSeqNumLoaded = Math.max(_maxSegmentSeqNumLoaded, llcSegmentName.getSequenceNumber()); + } + // notify all helix threads waiting for their offline -> consuming segment's prev segment to be loaded + _condition.signalAll(); + } finally { + _lock.unlock(); + } + } + + private void waitForPrevSegment(LLCSegmentName currSegment) + throws InterruptedException { + + long startTimeMs = System.currentTimeMillis(); + + if ((_relyOnIdealState) || (!_isFirstTransitionProcessed.get())) { + // if _relyOnIdealState or no offline -> consuming transition has been processed, it means rely on + // ideal state to fetch previous segment. + String previousSegment = getPreviousSegment(currSegment); + if (previousSegment == null) { + // previous segment can only be null if either all the previous segments are deleted or this is the starting + // sequence segment of the partition Group. + return; + } + + SegmentDataManager segmentDataManager = _realtimeTableDataManager.acquireSegment(previousSegment); + try { + _lock.lock(); + while (segmentDataManager == null) { + // if segmentDataManager == null, it means segment is not loaded in the server. + // wait until it's loaded. + while (!_condition.await(5, TimeUnit.MINUTES)) { + LOGGER.warn("Semaphore access denied to segment: {}. Waiting on previous segment: {} since: {} ms.", + currSegment.getSegmentName(), previousSegment, System.currentTimeMillis() - startTimeMs); + } + segmentDataManager = _realtimeTableDataManager.acquireSegment(previousSegment); + } + } finally { + _lock.unlock(); + if (segmentDataManager != null) { + _realtimeTableDataManager.releaseSegment(segmentDataManager); + } + } + + // the first transition will always be prone to error, consider edge case where segment previous to current + // helix transition's segment was deleted and this server came alive after successful deletion. the prev + // segment will not exist, hence first transition is handled using isFirstTransitionSuccessful. + _isFirstTransitionProcessed.compareAndSet(false, true); + return; + } + + int prevSeqNum = currSegment.getSequenceNumber() - 1; + _lock.lock(); + try { + while (_maxSegmentSeqNumLoaded < prevSeqNum) { + // it means all segments until _maxSegmentSeqNumLoaded is not loaded in the server. Wait until it's loaded. + while (!_condition.await(5, TimeUnit.MINUTES)) { Review Comment: This PR doesn't integrate the change from #15246. Do you want to open a separate PR for that? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org For additional commands, e-mail: commits-h...@pinot.apache.org
