[Flink] Add sourceParallelismUpperBound metric for auto-scaling systems#7117
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...mon-flink-common/src/main/java/org/apache/paimon/flink/source/ContinuousFileStoreSource.java
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* upstream/master: (33 commits) [core] Fix merge adjacent files in DataEvolutionCompactCoordinator [python] Rename list_tag to list_tags [python] add list tag for TagManager (apache#7264) [core][python] Introduce DataFileMeta.nonNullRowIdRange to unify codes [python] with_shard should be evenly distributed for data evolution mode (apache#7271) [core] Remove useless version in Varant [core] Should work with Split in DataTableBatchScan [core] Fix paimon_incremental_query with limit push down (apache#7269) [rest] Improve RestCatalog OpenAPI nonce generation (apache#7270) [cdc] Avoid sending empty schema change events to Schema Evolution (apache#7261) [python] Fix avro write timestamp without timezone wrongly (apache#7259) [doc] add doc for filter by _ROW_ID on data evolution (apache#7262) [fs] Extract jindo dls to separate module (apache#7263) [core] Add listTableDetails method to Catalog interface (apache#7266) [python] Support filter by _ROW_ID for data evolution (apache#7252) [Flink] Add sourceParallelismUpperBound metric for auto-scaling systems (apache#7117) [github] Add whether it is an AI-generated tag in the PR template (apache#7257) [core] Improve HttpClient error response handling (apache#7254) [python] Light refactor: move _is_blob_file check into DataFileMeta (apache#7256) [core] RowIdPredicateVisitor supports converting between statement (apache#7255) ...
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Purpose
This PR adds a new metric
sourceParallelismUpperBoundto the Flink Source Enumerator. This metric provides a recommended upper bound of parallelism for auto-scaling systems to optimize resource allocation.Motivation
Auto-scaling systems need to understand the optimal parallelism for Paimon sources to:
The metric value:
Note: This is a recommendation, not a hard limit - users can still configure higher parallelism manually if needed.
Tests
Added unit tests in
FileStoreSourceMetricsTest.java:continuousFileStoreFixBucketEnumeratorMetricsTest()- Verifies metric equals bucket number for fixed bucket tablescontinuousFileStoreDynBucketEnumeratorMetricsTest()- Verifies metric equals current parallelism for dynamic bucket tablesAlso added
TestingMetricUtils.getGauge()helper method for testing Gauge metrics.API and Format
No API or storage format changes. This only adds a new metric.
Documentation
Updated
docs/content/maintenance/metrics.mdwith the new metric description.