divijvaidya commented on code in PR #13535:
URL: https://github.com/apache/kafka/pull/13535#discussion_r1182330923
##########
core/src/main/java/kafka/log/remote/RemoteLogManager.java:
##########
@@ -600,25 +622,208 @@ public String toString() {
}
}
- long findHighestRemoteOffset(TopicIdPartition topicIdPartition) throws
RemoteStorageException {
- Optional<Long> offset = Optional.empty();
- Optional<UnifiedLog> maybeLog =
fetchLog.apply(topicIdPartition.topicPartition());
- if (maybeLog.isPresent()) {
- UnifiedLog log = maybeLog.get();
- Option<LeaderEpochFileCache> maybeLeaderEpochFileCache =
log.leaderEpochCache();
- if (maybeLeaderEpochFileCache.isDefined()) {
- LeaderEpochFileCache cache = maybeLeaderEpochFileCache.get();
- OptionalInt epoch = cache.latestEpoch();
- while (!offset.isPresent() && epoch.isPresent()) {
- offset =
remoteLogMetadataManager.highestOffsetForEpoch(topicIdPartition,
epoch.getAsInt());
- epoch = cache.previousEpoch(epoch.getAsInt());
+ public FetchDataInfo read(RemoteStorageFetchInfo remoteStorageFetchInfo)
throws RemoteStorageException, IOException {
+ int fetchMaxBytes = remoteStorageFetchInfo.fetchMaxBytes;
+ TopicPartition tp = remoteStorageFetchInfo.topicPartition;
+ FetchRequest.PartitionData fetchInfo =
remoteStorageFetchInfo.fetchInfo;
+
+ boolean includeAbortedTxns = remoteStorageFetchInfo.fetchIsolation ==
FetchIsolation.TXN_COMMITTED;
+
+ long offset = fetchInfo.fetchOffset;
+ int maxBytes = Math.min(fetchMaxBytes, fetchInfo.maxBytes);
+
+ Optional<UnifiedLog> logOptional = fetchLog.apply(tp);
+ OptionalInt epoch = OptionalInt.empty();
+
+ if (logOptional.isPresent()) {
+ Option<LeaderEpochFileCache> leaderEpochCache =
logOptional.get().leaderEpochCache();
+ if (leaderEpochCache.isDefined()) {
+ epoch = leaderEpochCache.get().epochForOffset(offset);
+ }
+ }
+
+ Optional<RemoteLogSegmentMetadata> rlsMetadataOptional =
epoch.isPresent()
+ ? fetchRemoteLogSegmentMetadata(tp, epoch.getAsInt(), offset)
+ : Optional.empty();
+
+ if (!rlsMetadataOptional.isPresent()) {
+ String epochStr = (epoch.isPresent()) ?
Integer.toString(epoch.getAsInt()) : "NOT AVAILABLE";
+ throw new OffsetOutOfRangeException("Received request for offset "
+ offset + " for leader epoch "
+ + epochStr + " and partition " + tp + " which does not
exist in remote tier.");
+ }
+
+ RemoteLogSegmentMetadata remoteLogSegmentMetadata =
rlsMetadataOptional.get();
+ int startPos = lookupPositionForOffset(remoteLogSegmentMetadata,
offset);
+ InputStream remoteSegInputStream = null;
+ try {
+ // Search forward for the position of the last offset that is
greater than or equal to the target offset
+ remoteSegInputStream =
remoteLogStorageManager.fetchLogSegment(remoteLogSegmentMetadata, startPos);
+ RemoteLogInputStream remoteLogInputStream = new
RemoteLogInputStream(remoteSegInputStream);
Review Comment:
Thanks, I added a JIRA https://issues.apache.org/jira/browse/KAFKA-14954 to
ensure that we are tracking it and don't forget about it.
I agree that this is not a major blocker from GC perspective as JVMs are
getting more intelligent about allocation/deallocation of byte[] but this adds
up in situations when we have large number of allocation. Another PR where we
removed data copy and allocation resulted in 2% CPU improvement (measured from
flamegraph) with JDK17. JDK 8 will probably have a larger impact.
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