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[FLINK-39321][pipeline-connector-paimon]Fixes a bug where Flink CDC fails to write to Paimon dynamic bucket tables when dynamic-bucket.initial-buckets=1 and Flink parallelism > 1. #4344

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[FLINK-39321][pipeline-connector-paimon]Fixes a bug where Flink CDC fails to write to Paimon dynamic bucket tables when dynamic-bucket.initial-buckets=1 and Flink parallelism > 1. #4344

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Fixes a bug where Flink CDC fails to write to Paimon dynamic bucket t…
zhaoruifeng01 Mar 26, 2026
9494c3c
Merge branch 'apache:master' into FLINK-39321
zhaoruifeng01 Apr 8, 2026
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9 changes: 6 additions & 3 deletions ...main/java/org/apache/flink/cdc/connectors/paimon/sink/v2/bucket/BucketAssignOperator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -336,6 +336,9 @@ public DataChangeEvent convertDataChangeEvent(DataChangeEvent dataChangeEvent)
long targetRowNum = table.coreOptions().dynamicBucketTargetRowNum();
Integer numAssigners = table.coreOptions().dynamicBucketInitialBuckets();
Integer maxBucketsNum = table.coreOptions().dynamicBucketMaxBuckets();
int minAssigners = MathUtils.min(numAssigners, totalTasksNumber);
int assignId = minAssigners == 1 ? 0 : currentTaskNumber;
int numChannels = minAssigners == 1 ? 1 : totalTasksNumber;
LOGGER.debug("Successfully get table info {}", table);
return new Tuple4<>(
table.bucketMode(),
Expand All @@ -344,9 +347,9 @@ public DataChangeEvent convertDataChangeEvent(DataChangeEvent dataChangeEvent)
table.snapshotManager(),
commitUser,
table.store().newIndexFileHandler(),
totalTasksNumber,
MathUtils.min(numAssigners, totalTasksNumber),
currentTaskNumber,
numChannels,
minAssigners,
assignId,
targetRowNum,
maxBucketsNum),
new RowPartitionKeyExtractor(table.schema()));
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