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https://issues.apache.org/jira/browse/FLINK-4844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15582784#comment-15582784
]
ASF GitHub Bot commented on FLINK-4844:
---------------------------------------
Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/2648#discussion_r83676027
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/AbstractPartitionedCheckpointOutputStream.java
---
@@ -0,0 +1,79 @@
+/*
+ * 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 org.apache.flink.util.Preconditions;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * Output stream that allows to write state into several partitions.
+ * @param <T> type of the returned state handle.
+ */
+public abstract class AbstractPartitionedCheckpointOutputStream<T extends
StreamStateHandle> extends OutputStream {
--- End diff --
I think the javadoc and class name don't accurately describe what this does
(possibly due to some refactoring). Now it should probably be called something
like `NonClosingCheckpointOutputStream`.
> Partitionable Raw Keyed/Operator State
> --------------------------------------
>
> Key: FLINK-4844
> URL: https://issues.apache.org/jira/browse/FLINK-4844
> Project: Flink
> Issue Type: New Feature
> Reporter: Stefan Richter
> Assignee: Stefan Richter
>
> Partitionable operator and keyed state are currently only available by using
> backends. However, the serialization code for many operators is build around
> reading/writing their state to a stream for checkpointing. We want to provide
> partitionable states also through streams, so that migrating existing
> operators becomes more easy.
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