JingsongLi commented on code in PR #584:
URL: https://github.com/apache/flink-table-store/pull/584#discussion_r1132084496
##########
flink-table-store-flink/flink-table-store-flink-common/src/main/java/org/apache/flink/table/store/connector/source/TableStoreSource.java:
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@@ -162,15 +164,47 @@ public ScanRuntimeProvider
getScanRuntimeProvider(ScanContext scanContext) {
.withProjection(projectFields)
.withPredicate(predicate)
.withLimit(limit)
- .withParallelism(
- Options.fromMap(table.schema().options())
-
.get(FlinkConnectorOptions.SCAN_PARALLELISM))
+ .withParallelism(inferParallelism(table, predicate,
limit, streaming))
.withWatermarkStrategy(watermarkStrategy);
return new TableStoreDataStreamScanProvider(
!streaming, env -> sourceBuilder.withEnv(env).build());
}
+ private Integer inferParallelism(
+ FileStoreTable table, Predicate predicate, Long limitCount,
boolean streaming) {
+ 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 =
table.newScan().withFilter(predicate).plan().splits.size();
Review Comment:
Maybe, without limit, just bucket number * 10?
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