satishd commented on code in PR #13561:
URL: https://github.com/apache/kafka/pull/13561#discussion_r1281672320
##########
core/src/main/java/kafka/log/remote/RemoteLogManager.java:
##########
@@ -618,6 +625,230 @@ public void run() {
}
}
+ public void handleLogStartOffsetUpdate(TopicPartition topicPartition,
long remoteLogStartOffset) {
+ if (isLeader()) {
+ logger.debug("Updating {} with remoteLogStartOffset: {}",
topicPartition, remoteLogStartOffset);
+ updateRemoteLogStartOffset.accept(topicPartition,
remoteLogStartOffset);
+ }
+ }
+
+ class RemoteLogRetentionHandler {
+
+ private final Optional<RetentionSizeData> retentionSizeData;
+ private final Optional<RetentionTimeData> retentionTimeData;
+
+ private long remainingBreachedSize;
+
+ private OptionalLong logStartOffset = OptionalLong.empty();
+
+ public RemoteLogRetentionHandler(Optional<RetentionSizeData>
retentionSizeData, Optional<RetentionTimeData> retentionTimeData) {
+ this.retentionSizeData = retentionSizeData;
+ this.retentionTimeData = retentionTimeData;
+ remainingBreachedSize = retentionSizeData.map(sizeData ->
sizeData.remainingBreachedSize).orElse(0L);
+ }
+
+ private boolean
deleteRetentionSizeBreachedSegments(RemoteLogSegmentMetadata metadata) throws
RemoteStorageException, ExecutionException, InterruptedException {
+ if (!retentionSizeData.isPresent()) {
+ return false;
+ }
+
+ boolean isSegmentDeleted = deleteRemoteLogSegment(metadata, x
-> {
+ // Assumption that segments contain size >= 0
+ if (retentionSizeData.get().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 {} due to
retention size {} breach. Log size after deletion will be {}.",
+ metadata.remoteLogSegmentId(),
retentionSizeData.get().retentionSize, remainingBreachedSize +
retentionSizeData.get().retentionSize);
+ }
+ return isSegmentDeleted;
+ }
+
+ public boolean
deleteRetentionTimeBreachedSegments(RemoteLogSegmentMetadata metadata)
+ throws RemoteStorageException, ExecutionException,
InterruptedException {
+ if (!retentionTimeData.isPresent()) {
+ return false;
+ }
+
+ boolean isSegmentDeleted = deleteRemoteLogSegment(metadata,
+ x -> x.maxTimestampMs() <=
retentionTimeData.get().cleanupUntilMs);
+ 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(),
retentionTimeData.get().retentionMs);
+ }
+ return isSegmentDeleted;
+ }
+
+ private boolean
deleteLogStartOffsetBreachedSegments(RemoteLogSegmentMetadata metadata, long
startOffset)
+ throws RemoteStorageException, ExecutionException,
InterruptedException {
+ boolean isSegmentDeleted = deleteRemoteLogSegment(metadata, x
-> startOffset > x.endOffset());
+ if (isSegmentDeleted && retentionSizeData.isPresent()) {
+ 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;
+ }
+
+ // It removes the segments beyond the current leader's earliest
epoch. Those segments are considered as
+ // unreferenced because they are not part of the current leader
epoch lineage.
+ 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;
+ }
+ }
+
+ }
+
+ private void cleanupExpiredRemoteLogSegments() throws
RemoteStorageException, ExecutionException, InterruptedException {
+ if (isCancelled() || !isLeader()) {
+ logger.info("Returning from remote log segments cleanup as the
task state is changed");
+ 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 retentionSize = log.config().retentionSize;
+ final boolean checkSizeRetention = retentionSize > -1;
+
+ final long retentionMs = log.config().retentionMs;
+ final boolean checkTimestampRetention = retentionMs > -1;
+
+ // 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
+ // iteration. But the logic can become little complex and need to
cover different scenarios to avoid any
+ // leaks. We can have a followup to improve it by maintaining
these values through both copying and deletion.
+ final Set<Integer> epochsSet = new HashSet<>();
+ long totalSizeEarlierToLocalLogStartOffset = 0L;
+ while (segmentMetadataIter.hasNext()) {
+ RemoteLogSegmentMetadata segmentMetadata =
segmentMetadataIter.next();
+
epochsSet.addAll(segmentMetadata.segmentLeaderEpochs().keySet());
+
+ if (checkSizeRetention && segmentMetadata.endOffset() <
log.localLogStartOffset()) {
+ totalSizeEarlierToLocalLogStartOffset +=
segmentMetadata.segmentSizeInBytes();
+ }
+ }
+
+ // All the leader epochs in sorted order that exists in remote
storage
+ final List<Integer> remoteLeaderEpochs = new
ArrayList<>(epochsSet);
+ Collections.sort(remoteLeaderEpochs);
+
+ Optional<RetentionSizeData> retentionSizeData =
buildRetentionSizeData(checkSizeRetention, retentionSize, log,
totalSizeEarlierToLocalLogStartOffset);
+ Optional<RetentionTimeData> retentionTimeData =
checkTimestampRetention
+ ? Optional.of(new RetentionTimeData(retentionMs,
time.milliseconds() - retentionMs))
+ : Optional.empty();
+ RemoteLogRetentionHandler remoteLogRetentionHandler = new
RemoteLogRetentionHandler(retentionSizeData, retentionTimeData);
+
+ LeaderEpochFileCache leaderEpochCache =
leaderEpochCacheOption.get();
+ Iterator<EpochEntry> epochEntryIterator =
leaderEpochCache.epochEntries().iterator();
+ boolean isSegmentDeleted = true;
+ while (isSegmentDeleted && epochEntryIterator.hasNext()) {
+ EpochEntry epochEntry = epochEntryIterator.next();
+ Iterator<RemoteLogSegmentMetadata> segmentsIterator =
remoteLogMetadataManager.listRemoteLogSegments(topicIdPartition,
epochEntry.epoch);
+ while (isSegmentDeleted && segmentsIterator.hasNext()) {
+ if (isCancelled() || !isLeader()) {
+ return;
+ }
+
+ RemoteLogSegmentMetadata metadata =
segmentsIterator.next();
+ isSegmentDeleted =
+
remoteLogRetentionHandler.deleteRetentionTimeBreachedSegments(metadata) ||
+
remoteLogRetentionHandler.deleteRetentionSizeBreachedSegments(metadata) ||
+
remoteLogRetentionHandler.deleteLogStartOffsetBreachedSegments(metadata,
log.logStartOffset());
+ }
+ }
+
+ // Remove the remote log segments whose segment-leader-epochs are
lesser than the earliest-epoch known
Review Comment:
All the size/time/startOffset handlers run based on the current leader’s
leader epochs. Here, we are removing the segments which have leader epochs
earlier to the lowest leader epoch on this broker(partition leader).
##########
core/src/main/java/kafka/log/remote/RemoteLogManager.java:
##########
@@ -618,6 +625,230 @@ public void run() {
}
}
+ public void handleLogStartOffsetUpdate(TopicPartition topicPartition,
long remoteLogStartOffset) {
+ if (isLeader()) {
+ logger.debug("Updating {} with remoteLogStartOffset: {}",
topicPartition, remoteLogStartOffset);
+ updateRemoteLogStartOffset.accept(topicPartition,
remoteLogStartOffset);
+ }
+ }
+
+ class RemoteLogRetentionHandler {
+
+ private final Optional<RetentionSizeData> retentionSizeData;
+ private final Optional<RetentionTimeData> retentionTimeData;
+
+ private long remainingBreachedSize;
+
+ private OptionalLong logStartOffset = OptionalLong.empty();
+
+ public RemoteLogRetentionHandler(Optional<RetentionSizeData>
retentionSizeData, Optional<RetentionTimeData> retentionTimeData) {
+ this.retentionSizeData = retentionSizeData;
+ this.retentionTimeData = retentionTimeData;
+ remainingBreachedSize = retentionSizeData.map(sizeData ->
sizeData.remainingBreachedSize).orElse(0L);
+ }
+
+ private boolean
deleteRetentionSizeBreachedSegments(RemoteLogSegmentMetadata metadata) throws
RemoteStorageException, ExecutionException, InterruptedException {
+ if (!retentionSizeData.isPresent()) {
+ return false;
+ }
+
+ boolean isSegmentDeleted = deleteRemoteLogSegment(metadata, x
-> {
+ // Assumption that segments contain size >= 0
+ if (retentionSizeData.get().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 {} due to
retention size {} breach. Log size after deletion will be {}.",
+ metadata.remoteLogSegmentId(),
retentionSizeData.get().retentionSize, remainingBreachedSize +
retentionSizeData.get().retentionSize);
+ }
+ return isSegmentDeleted;
+ }
+
+ public boolean
deleteRetentionTimeBreachedSegments(RemoteLogSegmentMetadata metadata)
+ throws RemoteStorageException, ExecutionException,
InterruptedException {
+ if (!retentionTimeData.isPresent()) {
+ return false;
+ }
+
+ boolean isSegmentDeleted = deleteRemoteLogSegment(metadata,
+ x -> x.maxTimestampMs() <=
retentionTimeData.get().cleanupUntilMs);
+ 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(),
retentionTimeData.get().retentionMs);
+ }
+ return isSegmentDeleted;
+ }
+
+ private boolean
deleteLogStartOffsetBreachedSegments(RemoteLogSegmentMetadata metadata, long
startOffset)
+ throws RemoteStorageException, ExecutionException,
InterruptedException {
+ boolean isSegmentDeleted = deleteRemoteLogSegment(metadata, x
-> startOffset > x.endOffset());
+ if (isSegmentDeleted && retentionSizeData.isPresent()) {
+ 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;
+ }
+
+ // It removes the segments beyond the current leader's earliest
epoch. Those segments are considered as
+ // unreferenced because they are not part of the current leader
epoch lineage.
+ 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;
+ }
+ }
+
+ }
+
+ private void cleanupExpiredRemoteLogSegments() throws
RemoteStorageException, ExecutionException, InterruptedException {
+ if (isCancelled() || !isLeader()) {
+ logger.info("Returning from remote log segments cleanup as the
task state is changed");
+ 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 retentionSize = log.config().retentionSize;
+ final boolean checkSizeRetention = retentionSize > -1;
+
+ final long retentionMs = log.config().retentionMs;
+ final boolean checkTimestampRetention = retentionMs > -1;
+
+ // 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
+ // iteration. But the logic can become little complex and need to
cover different scenarios to avoid any
+ // leaks. We can have a followup to improve it by maintaining
these values through both copying and deletion.
+ final Set<Integer> epochsSet = new HashSet<>();
+ long totalSizeEarlierToLocalLogStartOffset = 0L;
+ while (segmentMetadataIter.hasNext()) {
+ RemoteLogSegmentMetadata segmentMetadata =
segmentMetadataIter.next();
+
epochsSet.addAll(segmentMetadata.segmentLeaderEpochs().keySet());
+
+ if (checkSizeRetention && segmentMetadata.endOffset() <
log.localLogStartOffset()) {
+ totalSizeEarlierToLocalLogStartOffset +=
segmentMetadata.segmentSizeInBytes();
+ }
+ }
+
+ // All the leader epochs in sorted order that exists in remote
storage
+ final List<Integer> remoteLeaderEpochs = new
ArrayList<>(epochsSet);
+ Collections.sort(remoteLeaderEpochs);
+
+ Optional<RetentionSizeData> retentionSizeData =
buildRetentionSizeData(checkSizeRetention, retentionSize, log,
totalSizeEarlierToLocalLogStartOffset);
+ Optional<RetentionTimeData> retentionTimeData =
checkTimestampRetention
+ ? Optional.of(new RetentionTimeData(retentionMs,
time.milliseconds() - retentionMs))
+ : Optional.empty();
+ RemoteLogRetentionHandler remoteLogRetentionHandler = new
RemoteLogRetentionHandler(retentionSizeData, retentionTimeData);
+
+ LeaderEpochFileCache leaderEpochCache =
leaderEpochCacheOption.get();
+ Iterator<EpochEntry> epochEntryIterator =
leaderEpochCache.epochEntries().iterator();
+ boolean isSegmentDeleted = true;
+ while (isSegmentDeleted && epochEntryIterator.hasNext()) {
+ EpochEntry epochEntry = epochEntryIterator.next();
+ Iterator<RemoteLogSegmentMetadata> segmentsIterator =
remoteLogMetadataManager.listRemoteLogSegments(topicIdPartition,
epochEntry.epoch);
+ while (isSegmentDeleted && segmentsIterator.hasNext()) {
+ if (isCancelled() || !isLeader()) {
+ return;
+ }
+
+ RemoteLogSegmentMetadata metadata =
segmentsIterator.next();
+ isSegmentDeleted =
+
remoteLogRetentionHandler.deleteRetentionTimeBreachedSegments(metadata) ||
+
remoteLogRetentionHandler.deleteRetentionSizeBreachedSegments(metadata) ||
+
remoteLogRetentionHandler.deleteLogStartOffsetBreachedSegments(metadata,
log.logStartOffset());
+ }
+ }
+
+ // Remove the remote log segments whose segment-leader-epochs are
lesser than the earliest-epoch known
Review Comment:
All the size/time/startOffset handlers run based on the current leader’s
leader epochs. Here, we are removing the segments which have leader epochs
earlier to the lowest leader epoch on this broker(partition leader).
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