Abacn commented on code in PR #38064:
URL: https://github.com/apache/beam/pull/38064#discussion_r3066988690
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sdks/java/io/snowflake/src/main/java/org/apache/beam/sdk/io/snowflake/SnowflakeIO.java:
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@@ -424,31 +433,26 @@ public Read<T> withQuotationMark(ValueProvider<String>
quotationMark) {
public PCollection<T> expand(PBegin input) {
checkArguments();
- PCollection<Void> emptyCollection = input.apply(Create.of((Void) null));
String tmpDirName = makeTmpDirName();
- PCollection<T> output =
- emptyCollection
- .apply(
- ParDo.of(
- new CopyIntoStageFn(
- getDataSourceProviderFn(),
- getQuery(),
- getTable(),
- getStorageIntegrationName(),
- getStagingBucketName(),
- tmpDirName,
- getSnowflakeServices(),
- getQuotationMark())))
- .apply(Reshuffle.viaRandomKey())
- .apply(FileIO.matchAll())
Review Comment:
Dataflow can do it because `FileIO.matchAll()` has a ReShuffle present by
default:
https://github.com/apache/beam/blob/6dd599cf3f6b40efd44fa8c084c82ca40353a051/sdks/java/core/src/main/java/org/apache/beam/sdk/io/FileIO.java#L734-L735
It sounds a Flink runner bug if this does not work on Flink runner. Have you
tried to not set useDataStreamForBatch (only availlable for Flink 1.x)?
This PR essentially rewrites SnowflakeIO bounded read and would need a
closer eye (I could help for generic Java but less experience on Snowflake
connecor)
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