case class CommitMetadata(nextBatchWatermarkMs: Long = 0, stateUniqueIds: Option[Map[Long, Array[Array[String]]]] = None) extends Product with Serializable
In Checkpoint V2, for a stateful query, the checkpoint structure looks like below: 0 (operator ID) +----+ | 0 (partitionID) +----+ | ...... | 1 (partitionID) +----+ | |- default (storeName) | +-----+ | | 20_unique_id_1.zip | | 21_unique_id_2.delta | | 22_unique_id_3.delta | + 23_unique_id_4.delta | 2 (partitionID) +--- ...... In the commit log, in addition to nextBatchWatermarkMs, we also store the unique ids of the state store files.
- nextBatchWatermarkMs
The watermark of the next batch.
- stateUniqueIds
Map[Long, Array[Array[String]]] of map OperatorId -> (partitionID -> array of uniqueID)
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- new CommitMetadata(nextBatchWatermarkMs: Long = 0, stateUniqueIds: Option[Map[Long, Array[Array[String]]]] = None)
- nextBatchWatermarkMs
The watermark of the next batch.
- stateUniqueIds
Map[Long, Array[Array[String]]] of map OperatorId -> (partitionID -> array of uniqueID)
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(Since version 9)