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KAFKA-14260: add `synchronized` to `prefixScan` method (#12893) 

As a result of "14260: InMemoryKeyValueStore iterator still throws ConcurrentModificationException", I'm adding synchronized to prefixScan as an alternative to going back to the ConcurrentSkipList.

Reviewers: Anna Sophie Blee-Goldman <ableegoldman@apache.org>
This commit is contained in:
Lucia Cerchie 2022-12-06 20:39:32 -07:00 committed by GitHub
parent 96b1db510a
commit 923fea583b
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2 changed files with 23 additions and 2 deletions
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2
streams/src/main/java/org/apache/kafka/streams/state/internals/InMemoryKeyValueStore.java
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@ -169,7 +169,7 @@ public class InMemoryKeyValueStore implements KeyValueStore<Bytes, byte[]> {
}
@Override
public <PS extends Serializer<P>, P> KeyValueIterator<Bytes, byte[]> prefixScan(final P prefix, final PS prefixKeySerializer) {
public synchronized <PS extends Serializer<P>, P> KeyValueIterator<Bytes, byte[]> prefixScan(final P prefix, final PS prefixKeySerializer) {
final Bytes from = Bytes.wrap(prefixKeySerializer.serialize(null, prefix));
final Bytes to = Bytes.increment(from);

23
streams/src/test/java/org/apache/kafka/streams/state/internals/AbstractKeyValueStoreTest.java
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@ -16,6 +16,7 @@
*/
package org.apache.kafka.streams.state.internals;
import org.apache.kafka.common.serialization.IntegerSerializer;
import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.common.serialization.StringDeserializer;
@ -55,7 +56,6 @@ import static org.junit.Assert.fail;
public abstract class AbstractKeyValueStoreTest {
protected abstract <K, V> KeyValueStore<K, V> createKeyValueStore(final StateStoreContext context);
protected InternalMockProcessorContext context;
protected KeyValueStore<Integer, String> store;
protected KeyValueStoreTestDriver<Integer, String> driver;
@ -648,4 +648,25 @@ public abstract class AbstractKeyValueStoreTest {
);
}
}
@Test
public void prefixScanShouldNotThrowConcurrentModificationException() {
store.put(0, "zero");
store.put(1, "one");
store.put(222, "two-hundred-twenty-two");
store.put(2, "two");
store.put(22, "twenty-two");
store.put(3, "three");
try (final KeyValueIterator<Integer, String> iter = store.prefixScan(2, new IntegerSerializer())) {
store.delete(22);
while (iter.hasNext()) {
iter.next();
}
}
}
}