RecordChecksum¶

RecordChecksum is an abstraction of checksum "recorders" that can writeChecksumFile.

Contract¶

DeltaLog¶

deltaLog: DeltaLog

DeltaLog of the delta table to record the state of in a checksum file

SparkSession¶

spark: SparkSession

SparkSession (Spark SQL)

Implementations¶

CheckpointFileManager¶

writer: CheckpointFileManager

writer creates a CheckpointFileManager (for the logPath of this DeltaLog).

Lazy Value

writer is a Scala lazy value to guarantee that the code to initialize it is executed once only (when accessed for the first time) and the computed value never changes afterwards.

Learn more in the Scala Language Specification.

writeChecksumFile¶

writeChecksumFile(
  txnId: String,
  snapshot: Snapshot): Unit

writeChecksumFile...FIXME

writeChecksumFile is used when:

ChecksumHook is requested to run