HeartSaVioR commented on a change in pull request #31495: URL: https://github.com/apache/spark/pull/31495#discussion_r571355810
########## File path: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/OffsetSeqLog.scala ########## @@ -46,6 +47,23 @@ import org.apache.spark.sql.connector.read.streaming.{Offset => OffsetV2} class OffsetSeqLog(sparkSession: SparkSession, path: String) extends HDFSMetadataLog[OffsetSeq](sparkSession, path) { + private val cachedMetadata = new ju.TreeMap[Long, OffsetSeq]() + + override def add(batchId: Long, metadata: OffsetSeq): Boolean = { + val added = super.add(batchId, metadata) + if (added) { + // cache metadata as it will be read again + cachedMetadata.put(batchId, metadata) + // we don't access metadata for (batchId - 2) batches; evict them Review comment: Note for reviewers: see MicroBatchExecution / ContinuousExecution around calling `source.commit()`. To provide the offset metadata to source side we read offset metadata for previous batch, which is probably written by this driver in previous batches. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org