azexcy commented on code in PR #25787:
URL: https://github.com/apache/shardingsphere/pull/25787#discussion_r1198666166
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kernel/data-pipeline/core/src/main/java/org/apache/shardingsphere/data/pipeline/core/ingest/channel/memory/SimpleMemoryPipelineChannel.java:
##########
@@ -54,13 +54,22 @@ public void pushRecord(final Record dataRecord) {
public List<Record> fetchRecords(final int batchSize, final int timeout,
final TimeUnit timeUnit) {
List<Record> result = new ArrayList<>(batchSize);
long start = System.currentTimeMillis();
- while (batchSize > queue.size()) {
+ int recordsCount = 0;
+ while (batchSize > recordsCount) {
+ List<Record> records = queue.poll();
+ if (null == records || records.isEmpty()) {
+ TimeUnit.MILLISECONDS.sleep(100L);
Review Comment:
Yes, queue `poll` may return null
```
/**
* Retrieves and removes the head of this queue,
* or returns {@code null} if this queue is empty.
*
* @return the head of this queue, or {@code null} if this queue is empty
*/
E poll();
```
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