Re: [PR] [FLINK-33450][autoscaler] Support the JDBCAutoScalerStateStore [flink-kubernetes-operator]

["mxm (via GitHub)" <gi...@apache.org>]

mxm commented on code in PR #741:
URL: https://github.com/apache/flink-kubernetes-operator/pull/741#discussion_r1448905911


##########
flink-autoscaler-standalone/src/main/java/org/apache/flink/autoscaler/standalone/config/AutoscalerStandaloneOptions.java:
##########
@@ -59,4 +64,47 @@ private static ConfigOptions.OptionBuilder autoscalerStandaloneConfig(String key
                     .withDeprecatedKeys("flinkClusterPort")
                     .withDescription(
                             "The port of flink cluster when the flink-cluster fetcher is used.");
+
+    public static final ConfigOption<StateStoreType> STATE_STORE_TYPE =
+            autoscalerStandaloneConfig("state-store.type")
+                    .enumType(StateStoreType.class)
+                    .defaultValue(StateStoreType.MEMORY)
+                    .withDescription("The autoscaler state store type.");

Review Comment:
   We should list the options here.



##########
flink-autoscaler-plugin-jdbc/src/main/java/org/apache/flink/autoscaler/jdbc/state/JobStateView.java:
##########
@@ -0,0 +1,262 @@
+/*
+ * 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.autoscaler.jdbc.state;
+
+import org.apache.flink.annotation.VisibleForTesting;
+
+import javax.annotation.Nonnull;
+import javax.annotation.concurrent.NotThreadSafe;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+
+import static org.apache.flink.autoscaler.jdbc.state.JobStateView.State.NEEDS_CREATE;
+import static org.apache.flink.autoscaler.jdbc.state.JobStateView.State.NEEDS_DELETE;
+import static org.apache.flink.autoscaler.jdbc.state.JobStateView.State.NEEDS_UPDATE;
+import static org.apache.flink.autoscaler.jdbc.state.JobStateView.State.NOT_NEEDED;
+import static org.apache.flink.autoscaler.jdbc.state.JobStateView.State.UP_TO_DATE;
+import static org.apache.flink.util.Preconditions.checkState;
+
+/** The view of job state. */
+@NotThreadSafe
+public class JobStateView {
+
+    /**
+     * The state of state type about the cache and database.
+     *
+     * <p>Note: {@link #inLocally} and {@link #inDatabase} are only for understand, we don't use
+     * them.
+     */
+    @SuppressWarnings("unused")
+    enum State {
+
+        /** State doesn't exist at database, and it's not used so far, so it's not needed. */
+        NOT_NEEDED(false, false, false),
+        /** State is only stored locally, not created in JDBC database yet. */
+        NEEDS_CREATE(true, false, true),
+        /** State exists in JDBC database but there are newer local changes. */
+        NEEDS_UPDATE(true, true, true),
+        /** State is stored locally and in database, and they are same. */
+        UP_TO_DATE(true, true, false),
+        /** State is stored in database, but it's deleted in local. */
+        NEEDS_DELETE(false, true, true);

Review Comment:
   This looks conceptually very similar to `ConfigMapView`. I wonder if we could have shared some of that logic.



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