Offset — Read Position of Streaming Query

Offset is the base of stream positions that represent progress of a streaming query in json format.

Table 1. Offset Contract (Abstract Methods Only)
Method	Description
`json`	`String json()` Converts the offset to JSON format (JSON-encoded offset) Used when: `MicroBatchExecution` stream execution engine is requested to construct the next streaming micro-batch and run a streaming micro-batch (with MicroBatchReader sources) `OffsetSeq` is requested for the textual representation `OffsetSeqLog` is requested to serialize metadata (write metadata in serialized format) `ProgressReporter` is requested to record trigger offsets `ContinuousExecution` stream execution engine is requested to run a streaming query in continuous mode and commit an epoch

Table 2. Offsets
Offset	Description
ContinuousMemoryStreamOffset
FileStreamSourceOffset
KafkaSourceOffset
LongOffset
RateStreamOffset
SerializedOffset	JSON-encoded offset that is used when loading an offset from an external storage, e.g. from checkpoint after restart
TextSocketOffset

Offset