junrao commented on a change in pull request #10896:
URL: https://github.com/apache/kafka/pull/10896#discussion_r654568852
##########
File path: core/src/main/scala/kafka/log/Log.scala
##########
@@ -2390,16 +2390,23 @@ object Log extends Logging {
producerStateManager:
ProducerStateManager,
logPrefix: String): Unit = {
segmentsToDelete.foreach(_.changeFileSuffixes("", Log.DeletedFileSuffix))
+ val snapshotsToDelete = if (deleteProducerStateSnapshots)
+ segmentsToDelete.flatMap { segment =>
+
producerStateManager.removeAndMarkSnapshotForDeletion(segment.baseOffset)}
+ else
+ Seq()
def deleteSegments(): Unit = {
info(s"${logPrefix}Deleting segment files
${segmentsToDelete.mkString(",")}")
val parentDir = dir.getParent
maybeHandleIOException(logDirFailureChannel, parentDir, s"Error while
deleting segments for $topicPartition in dir $parentDir") {
segmentsToDelete.foreach { segment =>
segment.deleteIfExists()
- if (deleteProducerStateSnapshots)
- producerStateManager.removeAndDeleteSnapshot(segment.baseOffset)
}
+ snapshotsToDelete.foreach( snapshot => {
Review comment:
Could we just do the following?
```
snapshotsToDelete.foreach{ snapshot =>
snapshot.deleteIfExists()
}
```
##########
File path: core/src/main/scala/kafka/log/ProducerStateManager.scala
##########
@@ -828,12 +834,41 @@ class ProducerStateManager(val topicPartition:
TopicPartition,
* Removes the producer state snapshot file metadata corresponding to the
provided offset if it exists from this
* ProducerStateManager, and deletes the backing snapshot file.
*/
- private[log] def removeAndDeleteSnapshot(snapshotOffset: Long): Unit = {
+ private def removeAndDeleteSnapshot(snapshotOffset: Long): Unit = {
Option(snapshots.remove(snapshotOffset)).foreach(_.deleteIfExists())
}
+
+ /**
+ * Removes the producer state snapshot file metadata corresponding to the
provided offset if it exists from this
+ * ProducerStateManager, and renames the backing snapshot file to have the
Log.DeletionSuffix.
+ *
+ * Note: This method is safe to use with async deletes. If a race occurs and
the snapshot file
+ * is deleted without this ProducerStateManager instance knowing, the
resulting exception on
+ * SnapshotFile rename will be ignored and None will be returned.
+ */
+ private[log] def removeAndMarkSnapshotForDeletion(snapshotOffset: Long):
Option[SnapshotFile] = {
+ Option(snapshots.remove(snapshotOffset)).flatMap { snapshot => {
+ // If the file cannot be renamed, it likely means that the file was
deleted already.
+ // This can happen due to the way we construct an intermediate producer
state manager
Review comment:
Agree with Kowshik. It's not clear if the comment is still valid.
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