kbendick commented on a change in pull request #3977:
URL: https://github.com/apache/iceberg/pull/3977#discussion_r796157999
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File path: core/src/main/java/org/apache/iceberg/io/PartitionedFanoutWriter.java
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@@ -19,19 +19,52 @@
package org.apache.iceberg.io;
+import com.github.benmanes.caffeine.cache.Cache;
+import com.github.benmanes.caffeine.cache.Caffeine;
import java.io.IOException;
+import java.io.UncheckedIOException;
import java.util.Map;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.TimeUnit;
import org.apache.iceberg.FileFormat;
import org.apache.iceberg.PartitionKey;
import org.apache.iceberg.PartitionSpec;
-import org.apache.iceberg.relocated.com.google.common.collect.Maps;
+import org.apache.iceberg.TableProperties;
+import org.apache.iceberg.util.PropertyUtil;
+import org.apache.iceberg.util.Tasks;
public abstract class PartitionedFanoutWriter<T> extends BaseTaskWriter<T> {
- private final Map<PartitionKey, RollingFileWriter> writers =
Maps.newHashMap();
+ private Cache<PartitionKey, RollingFileWriter> writers;
protected PartitionedFanoutWriter(PartitionSpec spec, FileFormat format,
FileAppenderFactory<T> appenderFactory,
- OutputFileFactory fileFactory, FileIO io, long
targetFileSize) {
+ OutputFileFactory fileFactory, FileIO io,
+ long targetFileSize, Map<String, String> properties)
{
super(spec, format, appenderFactory, fileFactory, io, targetFileSize);
+ int writersCacheSize = PropertyUtil.propertyAsInt(
+ properties,
+ TableProperties.PARTITIONED_FANOUT_WRITERS_CACHE_SIZE,
+ TableProperties.PARTITIONED_FANOUT_WRITERS_CACHE_SIZE_DEFAULT);
+ long evictionTimeout = PropertyUtil.propertyAsLong(
+ properties,
+ TableProperties.PARTITIONED_FANOUT_WRITERS_CACHE_EVICT_MS,
+ TableProperties.PARTITIONED_FANOUT_WRITERS_CACHE_EVICT_MS_DEFAULT);
+ initWritersCache(writersCacheSize, evictionTimeout);
+ }
+
+ private synchronized void initWritersCache(int writersCacheSize, long
evictionTimeout) {
+ if (writers == null) {
+ writers = Caffeine.newBuilder()
+ .maximumSize(writersCacheSize)
+ .expireAfterAccess(evictionTimeout, TimeUnit.MILLISECONDS)
+ .removalListener((key, value, cause) -> {
Review comment:
This would instantiate a thread pool and evicted items would enter a
queue to go in there.
So I believe the removalListener would be run in a background thread
instantiated by Cafffeine.
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