stevenzwu commented on code in PR #9308:
URL: https://github.com/apache/iceberg/pull/9308#discussion_r1431726956
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flink/v1.18/flink/src/main/java/org/apache/iceberg/flink/source/reader/IcebergSourceSplitReader.java:
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@@ -80,6 +88,35 @@ public RecordsWithSplitIds<RecordAndPosition<T>> fetch()
throws IOException {
}
if (currentReader.hasNext()) {
+ if (pausedSplits.contains(currentSplitId)) {
+ // Wait until the reader is unblocked. Wake every second to catch any
missed signal.
+ // Return empty records if wakeUp is called, so pauseOrResumeSplits
could be processed.
+ boolean first = true;
Review Comment:
@pvary I am fine with while-loop and using wait timeout. I understand it is
safer for avoiding potential deadlock.
> The main issue is that the wakeUp and the pauseOrResumeSplits is not
atomic, we need another flag to store if the given wakeUp is handled, or not.
I see the problem now from the timeline example you said earlier.
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