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feat(plugin-iceberg): Lazy load partitions to avoid unnecessary loading #23645
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hantangwangd
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prestodb:master
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hantangwangd:make_partition_loading_lazy
Jan 7, 2026
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117 changes: 117 additions & 0 deletions
117
presto-hive-common/src/main/java/com/facebook/presto/hive/PartitionSet.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| /* | ||
| * Licensed 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 com.facebook.presto.hive; | ||
|
|
||
| import com.google.common.collect.AbstractIterator; | ||
| import com.google.common.collect.ImmutableList; | ||
| import com.google.errorprone.annotations.ThreadSafe; | ||
|
|
||
| import java.util.Iterator; | ||
| import java.util.List; | ||
|
|
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| import static java.util.Objects.requireNonNull; | ||
|
|
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| @ThreadSafe | ||
| public class PartitionSet | ||
| implements Iterable<HivePartition> | ||
| { | ||
| private volatile boolean fullyLoaded; | ||
| private PartitionLoader partitionLoader; | ||
| private List<HivePartition> partitions; | ||
|
|
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| public PartitionSet(List<HivePartition> partitions) | ||
| { | ||
| this.partitions = requireNonNull(partitions, "partitions is null"); | ||
| this.fullyLoaded = true; | ||
| } | ||
|
|
||
| public PartitionSet(PartitionLoader partitionLoader) | ||
| { | ||
| this.partitionLoader = requireNonNull(partitionLoader, "partitionLoader is null"); | ||
| } | ||
|
|
||
| @Override | ||
| public Iterator<HivePartition> iterator() | ||
| { | ||
| return new LazyIterator(this); | ||
| } | ||
|
|
||
| public List<HivePartition> getFullyLoadedPartitions() | ||
| { | ||
| tryFullyLoad(); | ||
| return partitions; | ||
| } | ||
|
|
||
| public boolean isEmpty() | ||
| { | ||
| if (fullyLoaded) { | ||
| return partitions.isEmpty(); | ||
| } | ||
| else { | ||
| synchronized (this) { | ||
| if (fullyLoaded) { | ||
| return partitions.isEmpty(); | ||
| } | ||
| return partitionLoader.isEmpty(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private void tryFullyLoad() | ||
| { | ||
| if (!fullyLoaded) { | ||
| synchronized (this) { | ||
| if (!fullyLoaded) { | ||
| partitions = ImmutableList.copyOf(partitionLoader.loadPartitions()); | ||
| fullyLoaded = true; | ||
| partitionLoader = null; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
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| public interface PartitionLoader | ||
| { | ||
| List<HivePartition> loadPartitions(); | ||
|
|
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| boolean isEmpty(); | ||
| } | ||
|
|
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| private static class LazyIterator | ||
| extends AbstractIterator<HivePartition> | ||
| { | ||
| private final PartitionSet lazyPartitions; | ||
| private List<HivePartition> partitions; | ||
| private int position = -1; | ||
|
|
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| private LazyIterator(PartitionSet lazyPartitions) | ||
| { | ||
| this.lazyPartitions = lazyPartitions; | ||
| } | ||
|
|
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| @Override | ||
| protected HivePartition computeNext() | ||
| { | ||
| if (partitions == null) { | ||
| partitions = lazyPartitions.getFullyLoadedPartitions(); | ||
| } | ||
|
|
||
| position++; | ||
| if (position >= partitions.size()) { | ||
| return endOfData(); | ||
| } | ||
| return partitions.get(position); | ||
| } | ||
| } | ||
| } |
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