mumrah commented on a change in pull request #10864:
URL: https://github.com/apache/kafka/pull/10864#discussion_r664594269
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File path: core/src/main/scala/kafka/raft/KafkaMetadataLog.scala
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@@ -312,28 +311,151 @@ final class KafkaMetadataLog private (
}
}
- override def deleteBeforeSnapshot(logStartSnapshotId: OffsetAndEpoch):
Boolean = {
+ /**
+ * Delete snapshots that come before a given snapshot ID. This is done by
advancing the log start offset to the given
+ * snapshot and cleaning old log segments.
+ *
+ * This will only happen if the following invariants all hold true:
+ *
+ * <li>The given snapshot precedes the latest snapshot</li>
+ * <li>The offset of the given snapshot is greater than the log start
offset</li>
+ * <li>The log layer can advance the offset to the given snapshot</li>
+ *
+ * This method is thread-safe
+ */
+ override def deleteBeforeSnapshot(snapshotId: OffsetAndEpoch): Boolean = {
val (deleted, forgottenSnapshots) = snapshots synchronized {
latestSnapshotId().asScala match {
- case Some(snapshotId) if (snapshots.contains(logStartSnapshotId) &&
- startOffset < logStartSnapshotId.offset &&
- logStartSnapshotId.offset <= snapshotId.offset &&
- log.maybeIncrementLogStartOffset(logStartSnapshotId.offset,
SnapshotGenerated)) =>
-
- // Delete all segments that have a "last offset" less than the log
start offset
- log.deleteOldSegments()
-
- // Forget snapshots less than the log start offset
- (true, forgetSnapshotsBefore(logStartSnapshotId))
+ case Some(latestSnapshotId) if
+ snapshots.contains(snapshotId) &&
+ startOffset < snapshotId.offset &&
+ snapshotId.offset <= latestSnapshotId.offset &&
+ log.maybeIncrementLogStartOffset(snapshotId.offset,
SnapshotGenerated) =>
+ // Delete all segments that have a "last offset" less than the log
start offset
+ log.deleteOldSegments()
+ // Remove older snapshots from the snapshots cache
+ (true, forgetSnapshotsBefore(snapshotId))
case _ =>
- (false, mutable.TreeMap.empty[OffsetAndEpoch,
Option[FileRawSnapshotReader]])
+ (false, mutable.TreeMap.empty[OffsetAndEpoch,
Option[FileRawSnapshotReader]])
}
}
-
removeSnapshots(forgottenSnapshots)
deleted
}
+ /**
+ * Force all known snapshots to have an open reader so we can know their
sizes. This method is not thread-safe
+ */
+ private def loadSnapshotSizes(): Seq[(OffsetAndEpoch, Long)] = {
+ snapshots.keys.toSeq.flatMap {
+ snapshotId => readSnapshot(snapshotId).asScala.map { reader =>
(snapshotId, reader.sizeInBytes())}
+ }
+ }
+
+ /**
+ * Return the max timestamp of the first batch in a snapshot, if the
snapshot exists and has records
+ */
+ private def readSnapshotTimestamp(snapshotId: OffsetAndEpoch): Option[Long]
= {
+ readSnapshot(snapshotId).asScala.flatMap { reader =>
+ val batchIterator = reader.records().batchIterator()
+
+ val firstBatch = batchIterator.next()
+ val records = firstBatch.streamingIterator(new
BufferSupplier.GrowableBufferSupplier())
+ if (firstBatch.isControlBatch) {
+ val header =
ControlRecordUtils.deserializedSnapshotHeaderRecord(records.next());
+ Some(header.lastContainedLogTimestamp())
+ } else {
+ warn("Did not find control record at beginning of snapshot")
+ None
+ }
+ }
+ }
+
+ /**
+ * Perform cleaning of old snapshots and log segments based on size.
+ *
+ * If our configured retention size has been violated, we perform cleaning
as follows:
+ *
+ * <li>Find oldest snapshot and delete it</li>
+ * <li>Advance log start offset to end of next oldest snapshot</li>
+ * <li>Delete log segments which wholly precede the new log start offset</li>
+ *
+ * This process is repeated until the retention size is no longer violated,
or until only
+ * a single snapshot remains.
+ */
+ override def maybeClean(): Boolean = {
+ snapshots synchronized {
+ cleanSnapshotsRetentionSize() || cleanSnapshotsRetentionMs()
Review comment:
Good catch, @dengziming. We should always try to clean both ways. I'll
rewrite this part (since I don't like using `|` as it's fairly uncommon)
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