vvcephei commented on a change in pull request #9543:
URL: https://github.com/apache/kafka/pull/9543#discussion_r517539432
##########
File path: streams/src/main/java/org/apache/kafka/streams/KafkaStreams.java
##########
@@ -719,8 +718,7 @@ private KafkaStreams(final InternalTopologyBuilder
internalTopologyBuilder,
}
// create the stream thread, global update thread, and cleanup thread
- threads = new StreamThread[numStreamThreads];
-
+ threads = new LinkedList<>();
Review comment:
Should this collection be threadsafe? (or are all accesses inside
synchronized blocks anyway?)
##########
File path: streams/src/main/java/org/apache/kafka/streams/KafkaStreams.java
##########
@@ -783,12 +781,13 @@ private KafkaStreams(final InternalTopologyBuilder
internalTopologyBuilder,
stateDirectory,
delegatingStateRestoreListener,
i + 1);
- threadState.put(threads[i].getId(), threads[i].state());
- storeProviders.add(new StreamThreadStateStoreProvider(threads[i]));
+ threads.add(i, streamThread);
+ threadState.put(streamThread.getId(), streamThread.state());
+ storeProviders.add(new
StreamThreadStateStoreProvider(threads.get(i)));
Review comment:
```suggestion
storeProviders.add(new
StreamThreadStateStoreProvider(streamThread));
```
`get(i)` is also O(n) for a linked list. Again, this is admittedly a nit,
since the list is small.
##########
File path: streams/src/main/java/org/apache/kafka/streams/KafkaStreams.java
##########
@@ -783,12 +781,13 @@ private KafkaStreams(final InternalTopologyBuilder
internalTopologyBuilder,
stateDirectory,
delegatingStateRestoreListener,
i + 1);
- threadState.put(threads[i].getId(), threads[i].state());
- storeProviders.add(new StreamThreadStateStoreProvider(threads[i]));
+ threads.add(i, streamThread);
Review comment:
A bit of a nitpick, but this operation is O(n) for LinkedList. Better to
just `add(streamThread)` if you want to use LinkedList.
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