Guosmilesmile opened a new pull request, #12703:
URL: https://github.com/apache/iceberg/pull/12703
When we enable range mode and set range-distribution-statistics-type=Sketch,
a NullPointerException occurs if the number of sort keys is less than the
downstream parallelism. In the SketchUtil.rangeBounds method, the SortKey[]
array is initialized with null values. If the number of sort keys during a
checkpoint duration is less than the downstream parallelism, this method will
pass a SortKey[] array containing null values, which leads to a
NullPointerException during serialization.
the error log like this:
```
org.apache.flink.util.FlinkException: Global failure triggered by
OperatorCoordinator for 'Source: source -> flat -> deliver ->
*anonymous_datastream_source$1*[1] -> Calc[2] -> range-shuffle' (operator
7016fb5b1ab54e21d55257a88ab9a39e).
at
org.apache.flink.runtime.operators.coordination.OperatorCoordinatorHolder$LazyInitializedCoordinatorContext.failJob(OperatorCoordinatorHolder.java:651)
~[flink-dist-1.19.1.jar:1.19.1]
at
org.apache.flink.runtime.operators.coordination.RecreateOnResetOperatorCoordinator$QuiesceableContext.failJob(RecreateOnResetOperatorCoordinator.java:248)
~[flink-dist-1.19.1.jar:1.19.1]
at
org.apache.iceberg.flink.sink.shuffle.DataStatisticsCoordinator.lambda$runInCoordinatorThread$2(DataStatisticsCoordinator.java:192)
~[flink-onejar-4.0.3.jar:?]
at
org.apache.flink.util.ThrowableCatchingRunnable.run(ThrowableCatchingRunnable.java:40)
~[flink-dist-1.19.1.jar:1.19.1]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
~[?:?]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
~[?:?]
at java.lang.Thread.run(Thread.java:829) ~[?:?]
Caused by: java.lang.NullPointerException
at
org.apache.iceberg.flink.sink.shuffle.SortKeySerializer.serialize(SortKeySerializer.java:146)
~[flink-onejar-4.0.3.jar:?]
at
org.apache.iceberg.flink.sink.shuffle.SortKeySerializer.serialize(SortKeySerializer.java:52)
~[flink-onejar-4.0.3.jar:?]
at
org.apache.flink.api.common.typeutils.base.ListSerializer.serialize(ListSerializer.java:126)
~[flink-dist-1.19.1.jar:1.19.1]
at
org.apache.iceberg.flink.sink.shuffle.GlobalStatisticsSerializer.serialize(GlobalStatisticsSerializer.java:106)
~[flink-onejar-4.0.3.jar:?]
at
org.apache.iceberg.flink.sink.shuffle.GlobalStatisticsSerializer.serialize(GlobalStatisticsSerializer.java:40)
~[flink-onejar-4.0.3.jar:?]
at
org.apache.iceberg.flink.sink.shuffle.StatisticsUtil.serializeGlobalStatistics(StatisticsUtil.java:106)
~[flink-onejar-4.0.3.jar:?]
at
org.apache.iceberg.flink.sink.shuffle.StatisticsEvent.createGlobalStatisticsEvent(StatisticsEvent.java:61)
~[flink-onejar-4.0.3.jar:?]
at
org.apache.iceberg.flink.sink.shuffle.DataStatisticsCoordinator.lambda$sendGlobalStatisticsToSubtasks$3(DataStatisticsCoordinator.java:259)
~[flink-onejar-4.0.3.jar:?]
at
org.apache.iceberg.flink.sink.shuffle.DataStatisticsCoordinator.lambda$runInCoordinatorThread$2(DataStatisticsCoordinator.java:184)
~[flink-onejar-4.0.3.jar:?]
... 4 more
```
This PR primarily modifies the rangeBounds method to create a SortKey[]
array without null values.
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