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https://issues.apache.org/jira/browse/FLINK-9938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16565238#comment-16565238
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ASF GitHub Bot commented on FLINK-9938:
---------------------------------------
StefanRRichter commented on a change in pull request #6460: [FLINK-9938] Clean
up full snapshot from expired state with TTL
URL: https://github.com/apache/flink/pull/6460#discussion_r206853713
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/state/StateSnapshotFilter.java
##########
@@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.state;
+
+import javax.annotation.Nonnull;
+
+import java.util.Optional;
+
+/**
+ * Filter of snapshot state values.
+ *
+ * <p>This filter can be applied to state values
+ * to decide which entries should be included into the snapshot (can be
modified before),
+ * others should be dropped (returns {@code Optional.empty()}).
+ */
+public interface StateSnapshotFilter<T> {
+ StateSnapshotFilter<?> SNAPSHOT_ALL = createSnapshotAll();
+
+ @SuppressWarnings("unchecked")
+ @Nonnull
+ static <T> StateSnapshotFilter<T> snapshotAll() {
+ return (StateSnapshotFilter<T>) SNAPSHOT_ALL;
Review comment:
Maybe `noFilter`or `unfiltered` is a better name?
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> State TTL cleanup during full state scan upon checkpointing
> -----------------------------------------------------------
>
> Key: FLINK-9938
> URL: https://issues.apache.org/jira/browse/FLINK-9938
> Project: Flink
> Issue Type: Improvement
> Components: State Backends, Checkpointing
> Affects Versions: 1.6.0
> Reporter: Andrey Zagrebin
> Assignee: Andrey Zagrebin
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.6.0
>
>
> We can try to piggyback full state scan during certain checkpoint processes
> in backends, check TTL expiration for every entry and evict expired to speed
> up cleanup.
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