gharris1727 commented on code in PR #15910:
URL: https://github.com/apache/kafka/pull/15910#discussion_r1602156155
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connect/mirror/src/main/java/org/apache/kafka/connect/mirror/MirrorCheckpointTask.java:
##########
@@ -103,10 +113,11 @@ public void start(Map<String, String> props) {
targetAdminClient =
config.forwardingAdmin(config.targetAdminConfig("checkpoint-target-admin"));
metrics = config.metrics();
idleConsumerGroupsOffset = new HashMap<>();
- checkpointsPerConsumerGroup = new HashMap<>();
+ Optional<Map<String, Map<TopicPartition, Checkpoint>>> checkpoints =
readCheckpoints(config);
Review Comment:
This is a potentially long blocking operation, and those should be avoided
in start() methods because while the task is starting, it can't be stopped, and
if the task can't be stopped within `task.shutdown.graceful.timeout.ms` it is
aggressively cancelled.
Since the main thread needs the result from readCheckpoints, I think it
would be fine to check if it's been loaded and if not, just return an empty
poll().
##########
connect/mirror/src/main/java/org/apache/kafka/connect/mirror/MirrorCheckpointTask.java:
##########
@@ -116,6 +127,73 @@ public void start(Map<String, String> props) {
consumerGroups.size(), sourceClusterAlias,
config.targetClusterAlias(), consumerGroups);
}
+ // read the checkpoints topic to initialize the
checkpointsPerConsumerGroup state of this task
+ // the callback may only handle errors thrown by consumer.poll in
KafkaBasedLog
+ // e.g. unauthorized to read from topic (non-retriable)
+ // if any are encountered, treat the loading of Checkpoints as failed.
+ Optional<Map<String, Map<TopicPartition, Checkpoint>>>
readCheckpoints(MirrorCheckpointTaskConfig config) {
+ AtomicBoolean successful = new AtomicBoolean(true);
+ Map<String, Map<TopicPartition, Checkpoint>> checkpoints = new
HashMap<>();
+ Callback<ConsumerRecord<byte[], byte[]>> consumedCallback = new
Callback<ConsumerRecord<byte[], byte[]>>() {
+ @Override
+ public void onCompletion(Throwable error, ConsumerRecord<byte[],
byte[]> cpRecord) {
+ if (error != null && successful.getAndSet(false)) {
+ log.error("Error loading Checkpoint topic", error);
Review Comment:
I'm on the fence whether this should be error or warn. It it something that
the user _must_ address? I'm not so sure.
I do think that this should have an actionable recommendation, or an
explanation that the task is gracefully degrading because of this.
##########
connect/mirror/src/main/java/org/apache/kafka/connect/mirror/OffsetSyncStore.java:
##########
@@ -105,7 +106,13 @@ private KafkaBasedLog<byte[], byte[]>
createBackingStore(MirrorCheckpointConfig
/**
* Start the OffsetSyncStore, blocking until all previous Offset Syncs
have been read from backing storage.
*/
- public void start() {
+ public void start(boolean initializationMustReadToEnd) {
+ this.initializationMustReadToEnd = initializationMustReadToEnd;
+ if (initializationMustReadToEnd) {
+ log.warn("OffsetSyncStore initializationMustReadToEnd = {}",
initializationMustReadToEnd);
Review Comment:
debug level, this is not worth warning about.
:+1: for the variable name
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