apoorvmittal10 commented on code in PR #18459:
URL: https://github.com/apache/kafka/pull/18459#discussion_r1915182706
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core/src/main/java/kafka/server/share/SharePartition.java:
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@@ -1204,25 +1205,91 @@ private AcquiredRecords acquireNewBatchRecords(
lastAcquiredOffset =
lastOffsetFromBatchWithRequestOffset(batches, firstAcquiredOffset +
maxFetchRecords - 1);
}
- // Schedule acquisition lock timeout for the batch.
- AcquisitionLockTimerTask timerTask =
scheduleAcquisitionLockTimeout(memberId, firstAcquiredOffset,
lastAcquiredOffset);
- // Add the new batch to the in-flight records along with the
acquisition lock timeout task for the batch.
- cachedState.put(firstAcquiredOffset, new InFlightBatch(
- memberId,
- firstAcquiredOffset,
- lastAcquiredOffset,
- RecordState.ACQUIRED,
- 1,
- timerTask));
+ // Create batches of acquired records.
+ List<AcquiredRecords> acquiredRecords = createBatches(batches,
firstAcquiredOffset, lastAcquiredOffset, memberId, batchSize);
// if the cachedState was empty before acquiring the new batches
then startOffset needs to be updated
if (cachedState.firstKey() == firstAcquiredOffset) {
startOffset = firstAcquiredOffset;
}
endOffset = lastAcquiredOffset;
- return new AcquiredRecords()
- .setFirstOffset(firstAcquiredOffset)
- .setLastOffset(lastAcquiredOffset)
- .setDeliveryCount((short) 1);
+ return new ShareAcquiredRecords(acquiredRecords, (int)
(lastAcquiredOffset - firstAcquiredOffset + 1));
+ } finally {
+ lock.writeLock().unlock();
+ }
+ }
+
+ private List<AcquiredRecords> createBatches(
+ Iterable<? extends RecordBatch> batches,
+ long firstAcquiredOffset,
+ long lastAcquiredOffset,
+ String memberId,
+ int batchSize
+ ) {
+ lock.writeLock().lock();
+ try {
+ List<AcquiredRecords> result = new ArrayList<>();
+ if (lastAcquiredOffset - firstAcquiredOffset + 1 <= batchSize) {
+ // No split of batches is required as the batch size is
greater than records which
+ // can be acquired.
+ result.add(new AcquiredRecords()
+ .setFirstOffset(firstAcquiredOffset)
+ .setLastOffset(lastAcquiredOffset)
+ .setDeliveryCount((short) 1));
+ } else {
+ // The batch is split into multiple batches considering batch
size.
+ long currentFirstOffset = firstAcquiredOffset;
+ RecordBatch lastBatch = null;
+ // Try reading only the baseOffset of the batch and avoid
reading the lastOffset as
+ // lastOffset call of RecordBatch is expensive (loads headers).
+ for (RecordBatch batch : batches) {
+ long batchBaseOffset = batch.baseOffset();
+ if (batchBaseOffset < firstAcquiredOffset) {
+ continue;
+ }
+
+ // Track last batch for filling the final batch, if
required.
+ lastBatch = batch;
+ // Check if the batch is already past the last acquired
offset then break.
+ if (batchBaseOffset > lastAcquiredOffset) {
+ result.add(new AcquiredRecords()
+ .setFirstOffset(currentFirstOffset)
+ .setLastOffset(lastAcquiredOffset)
+ .setDeliveryCount((short) 1));
Review Comment:
Yeah, agree. I have simplified the `if/else` statement as well to make
common insertion in array.
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