chenjunjiedada commented on code in PR #7077:
URL: https://github.com/apache/iceberg/pull/7077#discussion_r1133170289
##########
flink/v1.16/flink/src/main/java/org/apache/iceberg/flink/FlinkWriteConf.java:
##########
@@ -153,16 +167,89 @@ public String orcCompressionStrategy() {
.parse();
}
- public DistributionMode distributionMode() {
+ public DistributionMode distributionMode(
+ List<Integer> equalityFieldIds, List<String> equalityFieldColumns) {
String modeName =
confParser
.stringConf()
.option(FlinkWriteOptions.DISTRIBUTION_MODE.key())
.flinkConfig(FlinkWriteOptions.DISTRIBUTION_MODE)
.tableProperty(TableProperties.WRITE_DISTRIBUTION_MODE)
- .defaultValue(TableProperties.WRITE_DISTRIBUTION_MODE_NONE)
- .parse();
- return DistributionMode.fromName(modeName);
+ .parseOptional();
+
+ DistributionMode writeMode =
+ modeName == null
+ ? defaultWriteDistributionMode(equalityFieldIds)
+ : DistributionMode.fromName(modeName);
+
+ switch (writeMode) {
+ case NONE:
+ if (equalityFieldIds.isEmpty()) {
+ return NONE;
+ } else {
+ LOG.warn("Switch to use 'hash' distribution mode, because there are
equality fields set");
+ return HASH;
+ }
+
+ case HASH:
+ PartitionSpec partitionSpec = table.spec();
+ if (equalityFieldIds.isEmpty()) {
+ if (partitionSpec.isUnpartitioned()) {
+ LOG.warn(
+ "Fallback to use 'none' distribution mode, because there are
no equality fields set and table is unpartitioned");
+ return NONE;
+ }
+ } else {
+ if (partitionSpec.isPartitioned()) {
+ for (PartitionField partitionField : partitionSpec.fields()) {
+ Preconditions.checkState(
+ equalityFieldIds.contains(partitionField.sourceId()),
+ "In 'hash' distribution mode with equality fields set,
partition field '%s' "
+ + "should be included in equality fields: '%s'",
+ partitionField,
+ equalityFieldColumns);
+ }
+ }
+ }
+ return HASH;
+
+ case RANGE:
Review Comment:
If the sort order is defined, it would be better to throw an exception to
tell the user that flink writer can't guarantee the order rather than fallback
to these writers.
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