satishd commented on code in PR #13561: URL: https://github.com/apache/kafka/pull/13561#discussion_r1181529149
########## core/src/main/java/kafka/log/remote/RemoteLogManager.java: ########## @@ -595,6 +609,193 @@ public void run() { } } + public void handleLogStartOffsetUpdate(TopicPartition topicPartition, long remoteLogStartOffset) { + logger.debug("Updating $topicPartition with remoteLogStartOffset: {}", remoteLogStartOffset); + updateRemoteLogStartOffset.accept(topicPartition, remoteLogStartOffset); + } + + class RemoteLogRetentionHandler { + + private long remainingBreachedSize = 0L; + private OptionalLong logStartOffset = OptionalLong.empty(); + + public RemoteLogRetentionHandler(long remainingBreachedSize) { + this.remainingBreachedSize = remainingBreachedSize; + } + + private boolean deleteRetentionSizeBreachedSegments(RemoteLogSegmentMetadata metadata, boolean checkSizeRetention) throws RemoteStorageException, ExecutionException, InterruptedException { + boolean isSegmentDeleted = deleteRemoteLogSegment(metadata, x -> { + // Assumption that segments contain size > 0 + if (checkSizeRetention && remainingBreachedSize > 0) { + remainingBreachedSize -= x.segmentSizeInBytes(); + return remainingBreachedSize >= 0; + } else return false; + }); + if (isSegmentDeleted) { + logStartOffset = OptionalLong.of(metadata.endOffset() + 1); + logger.info("Deleted remote log segment ${metadata.remoteLogSegmentId()} due to retention size " + + "${log.config.retentionSize} breach. Log size after deletion will be " + + "${remainingBreachedSize + log.config.retentionSize}."); + } + return isSegmentDeleted; + } + + private boolean deleteLogStartOffsetBreachedSegments(RemoteLogSegmentMetadata metadata, long startOffset) + throws RemoteStorageException, ExecutionException, InterruptedException { + boolean isSegmentDeleted = deleteRemoteLogSegment(metadata, x -> startOffset > x.endOffset()); + if (isSegmentDeleted) { + remainingBreachedSize = Math.max(0, remainingBreachedSize - metadata.segmentSizeInBytes()); + logger.info("Deleted remote log segment {} due to log start offset {} breach", metadata.remoteLogSegmentId(), startOffset); + } + + // No need to update the logStartOffset. + return isSegmentDeleted; + } + + // There are two cases: + // 1) When there are offline partitions and a new replica with empty disk is brought as leader, then the + // leader-epoch gets bumped but the log-start-offset gets truncated back to 0. + // 2) To remove the unreferenced segments. + private boolean deleteLogSegmentsDueToLeaderEpochCacheTruncation(EpochEntry earliestEpochEntry, RemoteLogSegmentMetadata metadata) throws RemoteStorageException, ExecutionException, InterruptedException { + boolean isSegmentDeleted = deleteRemoteLogSegment(metadata, x -> + x.segmentLeaderEpochs().keySet().stream().allMatch(epoch -> epoch < earliestEpochEntry.epoch)); + if (isSegmentDeleted) { + logger.info("Deleted remote log segment ${} due to leader epoch cache truncation. Current earliest epoch: {}, segmentEndOffset: {} and segmentEpochs: {}", + metadata.remoteLogSegmentId(), earliestEpochEntry, metadata.endOffset(), metadata.segmentLeaderEpochs().keySet()); + } + + // No need to update the log-start-offset as these epochs/offsets are earlier to that value. + return isSegmentDeleted; + } + + private boolean deleteRemoteLogSegment(RemoteLogSegmentMetadata segmentMetadata, Predicate<RemoteLogSegmentMetadata> predicate) + throws RemoteStorageException, ExecutionException, InterruptedException { + if (predicate.test(segmentMetadata)) { + // Publish delete segment started event. + remoteLogMetadataManager.updateRemoteLogSegmentMetadata( + new RemoteLogSegmentMetadataUpdate(segmentMetadata.remoteLogSegmentId(), time.milliseconds(), + RemoteLogSegmentState.DELETE_SEGMENT_STARTED, brokerId)).get(); + + // Delete the segment in remote storage. + remoteLogStorageManager.deleteLogSegmentData(segmentMetadata); + + // Publish delete segment finished event. + remoteLogMetadataManager.updateRemoteLogSegmentMetadata( + new RemoteLogSegmentMetadataUpdate(segmentMetadata.remoteLogSegmentId(), time.milliseconds(), + RemoteLogSegmentState.DELETE_SEGMENT_FINISHED, brokerId)).get(); + return true; + } else { + return false; + } + } + + public boolean deleteRetentionTimeBreachedSegments(RemoteLogSegmentMetadata metadata, + boolean checkTimestampRetention, + long cleanupTs, + long retentionMs) + throws RemoteStorageException, ExecutionException, InterruptedException { + boolean isSegmentDeleted = deleteRemoteLogSegment(metadata, + x -> checkTimestampRetention && x.maxTimestampMs() <= cleanupTs); + if (isSegmentDeleted) { + remainingBreachedSize = Math.max(0, remainingBreachedSize - metadata.segmentSizeInBytes()); + // It is fine to have logStartOffset as `metadata.endOffset() + 1` as the segment offset intervals + // are ascending with in an epoch. + logStartOffset = OptionalLong.of(metadata.endOffset() + 1); + logger.info("Deleted remote log segment {} due to retention time " + + "{}ms breach based on the largest record timestamp in the segment", metadata.remoteLogSegmentId(), retentionMs); + } + return isSegmentDeleted; + } + } + + private void cleanupExpiredRemoteLogSegments() throws RemoteStorageException, ExecutionException, InterruptedException { + if (isCancelled()) + return; + + // Cleanup remote log segments and update the log start offset if applicable. + final Iterator<RemoteLogSegmentMetadata> segmentMetadataIter = remoteLogMetadataManager.listRemoteLogSegments(topicIdPartition); + if (!segmentMetadataIter.hasNext()) { + return; + } + + final Optional<UnifiedLog> logOptional = fetchLog.apply(topicIdPartition.topicPartition()); + if (!logOptional.isPresent()) { + return; + } + + final UnifiedLog log = logOptional.get(); + final Option<LeaderEpochFileCache> leaderEpochCacheOption = log.leaderEpochCache(); + if (leaderEpochCacheOption.isEmpty()) { + return; + } + + final long retentionMs = log.config().retentionMs; + + // Iterate once + // - to build the log size of segments with base-offset < local-log-start-offset + // - to collect all the epochs of remote log segments + // These values can be cached and updated in RLMTask for this topic partition without computing in each Review Comment: Sure, let us discuss this out side of this PR. -- This is an automated message from the Apache Git Service. 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