zhangjun0x01 commented on code in PR #584:
URL: https://github.com/apache/incubator-paimon/pull/584#discussion_r1145071909
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paimon-flink/paimon-flink-common/src/main/java/org/apache/paimon/flink/source/DataTableSource.java:
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@@ -163,15 +167,44 @@ public ScanRuntimeProvider
getScanRuntimeProvider(ScanContext scanContext) {
.withProjection(projectFields)
.withPredicate(predicate)
.withLimit(limit)
- .withParallelism(
- Options.fromMap(table.schema().options())
-
.get(FlinkConnectorOptions.SCAN_PARALLELISM))
+ .withParallelism(inferParallelism())
.withWatermarkStrategy(watermarkStrategy);
return new PaimonDataStreamScanProvider(
!streaming, env -> sourceBuilder.withEnv(env).build());
}
+ private Integer inferParallelism() {
+ Options options = Options.fromMap(this.table.schema().options());
+ Integer parallelism =
options.get(FlinkConnectorOptions.SCAN_PARALLELISM);
+
+ if (options.get(FlinkConnectorOptions.INFER_SCAN_PARALLELISM)) {
+ // for streaming mode, set the default parallelism to the bucket
number.
+ if (streaming) {
+ parallelism = options.get(CoreOptions.BUCKET);
+ } else {
+ int splitSize = 1;
Review Comment:
for empty ,the split will be empty, my initial idea was init the `splitSize
` to 1 to guarantee inferred parallelism should be at least 1
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