Aljoscha Krettek created FLINK-9060:
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Summary: Deleting state using KeyedStateBackend.getKeys() throws Exception
Key: FLINK-9060
URL:
https://issues.apache.org/jira/browse/FLINK-9060 Project: Flink
Issue Type: Bug
Components: State Backends, Checkpointing
Reporter: Aljoscha Krettek
Fix For: 1.5.0
Adding this test to {{StateBackendTestBase}} showcases the problem:
{code}
@Test
public void testConcurrentModificationWithGetKeys() throws Exception {
AbstractKeyedStateBackend<Integer> backend = createKeyedBackend(IntSerializer.INSTANCE);
try {
ListStateDescriptor<String> listStateDescriptor =
new ListStateDescriptor<>("foo", StringSerializer.INSTANCE);
backend.setCurrentKey(1);
backend
.getPartitionedState(VoidNamespace.INSTANCE, VoidNamespaceSerializer.INSTANCE, listStateDescriptor)
.add("Hello");
backend.setCurrentKey(2);
backend
.getPartitionedState(VoidNamespace.INSTANCE, VoidNamespaceSerializer.INSTANCE, listStateDescriptor)
.add("Ciao");
Stream<Integer> keys = backend
.getKeys(listStateDescriptor.getName(), VoidNamespace.INSTANCE);
keys.forEach((key) -> {
backend.setCurrentKey(key);
try {
backend
.getPartitionedState(
VoidNamespace.INSTANCE,
VoidNamespaceSerializer.INSTANCE,
listStateDescriptor)
.clear();
} catch (Exception e) {
e.printStackTrace();
}
});
}
finally {
IOUtils.closeQuietly(backend);
backend.dispose();
}
}
{code}
This should work because one of the use cases of {{getKeys()}} and {{applyToAllKeys()}} is to do stuff for every key, which includes deleting them.
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