HuangZhenQiu commented on code in PR #18040:
URL: https://github.com/apache/hudi/pull/18040#discussion_r2744222246
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hudi-flink-datasource/hudi-flink/src/main/java/org/apache/hudi/source/reader/HoodieRecordEmitter.java:
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@@ -18,19 +18,55 @@
package org.apache.hudi.source.reader;
+import org.apache.flink.api.common.eventtime.Watermark;
import org.apache.flink.api.connector.source.SourceOutput;
import org.apache.flink.connector.base.source.reader.RecordEmitter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.hudi.common.fs.FSUtils;
+import org.apache.hudi.common.util.ValidationUtils;
import org.apache.hudi.source.split.HoodieSourceSplit;
/**
* Default Hoodie record emitter.
- * @param <T>
+ *
+ * <p>This emitter handles watermark emission based on split information.
+ *
+ * @param <T> The type of records to emit
*/
public class HoodieRecordEmitter<T> implements
RecordEmitter<HoodieRecordWithPosition<T>, T, HoodieSourceSplit> {
+ private static final Logger LOG =
LoggerFactory.getLogger(HoodieRecordEmitter.class);
+ private HoodieSourceSplit lastSplit = null;
+ private long watermark = Long.MIN_VALUE;
@Override
public void emitRecord(HoodieRecordWithPosition<T> record, SourceOutput<T>
output, HoodieSourceSplit split) throws Exception {
+ if (lastSplit == null || !split.splitId().equals(lastSplit.splitId())) {
+ long newWatermark = extractWatermark(split);
+ if (newWatermark < watermark) {
+ LOG.info(
+ "Received a new split with lower watermark. Previous watermark =
{}, current watermark = {}, previous split = {}, current split = {}",
+ watermark,
+ newWatermark,
+ lastSplit,
+ split);
+ } else {
+ watermark = newWatermark;
+ output.emitWatermark(new Watermark(watermark));
+ LOG.debug("Watermark = {} emitted based on split = {}", watermark,
split);
+ }
+
+ lastSplit = split;
+ }
+
output.collect(record.record());
split.updatePosition(record.fileOffset(), record.recordOffset());
}
+
+ private long extractWatermark(HoodieSourceSplit split) {
+ // CDC split will be handled later
+ ValidationUtils.checkArgument(split.getBasePath().isPresent(), "Split base
path can't be null.");
+ return Long.parseLong(FSUtils.getCommitTime(split.getBasePath().get()));
Review Comment:
The latestCommit in HoodieSourceSplit is the lastest commit when scans
completed commits since the last scan time. The file level commit time is in a
lower granularity and introduces a more accurate of watermark.
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