zhengzengprc commented on a change in pull request #3039:
URL: https://github.com/apache/iceberg/pull/3039#discussion_r715975873
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File path:
spark3/src/main/java/org/apache/iceberg/spark/source/SparkMicroBatchStream.java
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@@ -238,9 +247,8 @@ public StreamingOffset initialOffset() {
}
table.refresh();
- StreamingOffset offset = table.currentSnapshot() == null ?
- StreamingOffset.START_OFFSET :
- new StreamingOffset(SnapshotUtil.oldestSnapshot(table).snapshotId(),
0, false);
+ StreamingOffset offset = isStreamEmpty(table, fromTimestamp) ?
StreamingOffset.START_OFFSET :
+ new StreamingOffset(SnapshotUtil.oldestSnapshot(table,
fromTimestamp).snapshotId(), 0, false);
Review comment:
Sorry my understanding is wrong. @kbendick Yes, that's exactly the
behavior.
Just create a unit test to prove the above scenario. When we pass 30, the
stream processing will return nothing
Because:
@Override
public InputPartition[] planInputPartitions(Offset start, Offset end) {
Preconditions.checkArgument(end instanceof StreamingOffset, "Invalid end
offset: %s is not a StreamingOffset", end);
Preconditions.checkArgument(
start instanceof StreamingOffset, "Invalid start offset: %s is not a
StreamingOffset", start);
if (end.equals(StreamingOffset.START_OFFSET)) {
return new InputPartition[0];
}
In this case start == end, we won't have anything offset to process
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