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https://issues.apache.org/jira/browse/FLINK-9060?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sihua Zhou reassigned FLINK-9060:
---------------------------------
Assignee: Sihua Zhou
> 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
> Assignee: Sihua Zhou
> Priority: Blocker
> 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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