reuvenlax commented on a change in pull request #14852:
URL: https://github.com/apache/beam/pull/14852#discussion_r638318157
##########
File path:
runners/google-cloud-dataflow-java/src/main/java/org/apache/beam/runners/dataflow/GroupIntoBatchesOverride.java
##########
@@ -87,14 +94,22 @@ private BatchGroupIntoBatches(long batchSize) {
new DoFn<KV<K, Iterable<V>>, KV<K, Iterable<V>>>() {
@ProcessElement
public void process(ProcessContext c) {
- // Iterators.partition lazily creates the partitions as
they are accessed
- // allowing it to partition very large iterators.
- Iterator<List<V>> iterator =
-
Iterators.partition(c.element().getValue().iterator(), (int) batchSize);
-
- // Note that GroupIntoBatches only outputs when the
batch is non-empty.
- while (iterator.hasNext()) {
- c.output(KV.of(c.element().getKey(), iterator.next()));
+ List<V> currentBatch = Lists.newArrayList();
+ long batchSizeBytes = 0;
+ for (V element : c.element().getValue()) {
+ currentBatch.add(element);
+ if (weigher != null) {
+ batchSizeBytes += weigher.apply(element);
+ }
+ if (currentBatch.size() == maxBatchSizeElements
+ || (maxBatchSizeBytes != Long.MAX_VALUE
+ && batchSizeBytes >= maxBatchSizeBytes)) {
+ c.output(KV.of(c.element().getKey(), currentBatch));
+ // Call clear() since that allows us to reuse the
array memory for
+ // subsequent batches.
+ currentBatch.clear();
+ batchSizeBytes = 0;
+ }
}
Review comment:
Yes - I noticed that as well and pushed a fix.
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