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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2022/01/12 12:40:28 UTC

[GitHub] [flink] akalash opened a new pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

akalash opened a new pull request #18341:
URL: https://github.com/apache/flink/pull/18341


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   ## What is the purpose of the change
   
   This  PR introduces the API for duplicating artefacts
   
   
   ## Brief change log
   
   *(for example:)*
     - *Several new interfaces was created*
   
   
   ## Verifying this change
   
   
   
   This change added tests and can be verified as follows:
   
   
     - *New test for CheckpointStateToolset*
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (**yes** / no)
     - The serializers: (yes / **no** / don't know)
     - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't know)
     - The S3 file system connector: (yes / **no** / don't know)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (**yes** / no)
     - If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
   


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] dawidwys commented on a change in pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
dawidwys commented on a change in pull request #18341:
URL: https://github.com/apache/flink/pull/18341#discussion_r783719605



##########
File path: flink-core/src/main/java/org/apache/flink/core/fs/DuplicatingFileSystem.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.core.fs;
+
+import java.io.IOException;
+import java.util.List;
+
+/**
+ * An extension interface for {@link FileSystem FileSystems} that can perform cheap DFS side
+ * duplicate operation. Such an operation can improve the time required for creating cheaply
+ * independent snapshots from incremental snapshots.
+ */
+public interface DuplicatingFileSystem {

Review comment:
       Not sure, if I understand your concern. Do you mind to elaborate?




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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] akalash commented on a change in pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
akalash commented on a change in pull request #18341:
URL: https://github.com/apache/flink/pull/18341#discussion_r783176332



##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/state/CheckpointStreamFactory.java
##########
@@ -39,4 +40,31 @@
      */
     CheckpointStateOutputStream createCheckpointStateOutputStream(CheckpointedStateScope scope)
             throws IOException;
+
+    /**
+     * Tells if we can duplicate the given {@link StreamStateHandle} into the path corresponding to
+     * the given {@link CheckpointedStateScope}.
+     *
+     * <p>This should be a rather cheap operation, preferably not involving any remote accesses.
+     *
+     * @param stateHandle The handle to duplicate
+     * @param scope Scope determining the location to duplicate into
+     * @return true, if we can perform the duplication
+     */
+    boolean canFastDuplicate(StreamStateHandle stateHandle, CheckpointedStateScope scope)
+            throws IOException;
+
+    /**
+     * Duplicates {@link StreamStateHandle} into the path corresponding to * the given {@link
+     * CheckpointedStateScope}.
+     *
+     * <p>You should first check if you can duplicate with {@link
+     * #canFastDuplicate(StreamStateHandle, CheckpointedStateScope)}.
+     *
+     * @param stateHandles The handles to duplicate
+     * @param scope Scope determining the location to duplicate into
+     * @return The duplicated handle
+     */
+    List<StreamStateHandle> duplicate(

Review comment:
       I want to share my concern about matching the names of methods and class. It is not clear why *Factory duplicate something when Factory should only create something. I understand that creating streams and duplicating files are kind of one-level things but maybe we think about renaming the class?

##########
File path: flink-core/src/main/java/org/apache/flink/core/fs/DuplicatingFileSystem.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.core.fs;
+
+import java.io.IOException;
+import java.util.List;
+
+/**
+ * An extension interface for {@link FileSystem FileSystems} that can perform cheap DFS side
+ * duplicate operation. Such an operation can improve the time required for creating cheaply
+ * independent snapshots from incremental snapshots.
+ */
+public interface DuplicatingFileSystem {

Review comment:
       Right now, we get FileSystem from Path#getFileSystem. Do I understand correctly that we will need to rewrite this code as well?




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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] akalash commented on a change in pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
akalash commented on a change in pull request #18341:
URL: https://github.com/apache/flink/pull/18341#discussion_r787004952



##########
File path: flink-core/src/main/java/org/apache/flink/core/fs/DuplicatingFileSystem.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.core.fs;
+
+import java.io.IOException;
+import java.util.List;
+
+/**
+ * An extension interface for {@link FileSystem FileSystems} that can perform cheap DFS side
+ * duplicate operation. Such an operation can improve the time required for creating cheaply
+ * independent snapshots from incremental snapshots.
+ */
+public interface DuplicatingFileSystem {

Review comment:
       My question was how does this interface will be used. I thought that we are using FileSystem implementation from a third-party library but now I understand we have our own implementation as well so it should not be a problem to expand the such implementation with this interface.




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[GitHub] [flink] akalash commented on a change in pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
akalash commented on a change in pull request #18341:
URL: https://github.com/apache/flink/pull/18341#discussion_r787001749



##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/state/CheckpointStreamFactory.java
##########
@@ -39,4 +40,31 @@
      */
     CheckpointStateOutputStream createCheckpointStateOutputStream(CheckpointedStateScope scope)
             throws IOException;
+
+    /**
+     * Tells if we can duplicate the given {@link StreamStateHandle} into the path corresponding to
+     * the given {@link CheckpointedStateScope}.
+     *
+     * <p>This should be a rather cheap operation, preferably not involving any remote accesses.
+     *
+     * @param stateHandle The handle to duplicate
+     * @param scope Scope determining the location to duplicate into
+     * @return true, if we can perform the duplication
+     */
+    boolean canFastDuplicate(StreamStateHandle stateHandle, CheckpointedStateScope scope)
+            throws IOException;
+
+    /**
+     * Duplicates {@link StreamStateHandle} into the path corresponding to * the given {@link
+     * CheckpointedStateScope}.
+     *
+     * <p>You should first check if you can duplicate with {@link
+     * #canFastDuplicate(StreamStateHandle, CheckpointedStateScope)}.
+     *
+     * @param stateHandles The handles to duplicate
+     * @param scope Scope determining the location to duplicate into
+     * @return The duplicated handle
+     */
+    List<StreamStateHandle> duplicate(

Review comment:
       As I understand, this factory is a semi-public interface(it has an implementation in several places). So perhaps, it doesn't make sense to change the name right now. Considering that I don't have the better name in my mind.




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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot commented on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011009459


   Thanks a lot for your contribution to the Apache Flink project. I'm the @flinkbot. I help the community
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   ## Automated Checks
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   <sub>Mention the bot in a comment to re-run the automated checks.</sub>
   ## Review Progress
   
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   Please see the [Pull Request Review Guide](https://flink.apache.org/contributing/reviewing-prs.html) for a full explanation of the review process.<details>
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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot commented on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] dawidwys merged pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
dawidwys merged pull request #18341:
URL: https://github.com/apache/flink/pull/18341


   


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] dawidwys commented on a change in pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
dawidwys commented on a change in pull request #18341:
URL: https://github.com/apache/flink/pull/18341#discussion_r783728042



##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/state/CheckpointStreamFactory.java
##########
@@ -39,4 +40,31 @@
      */
     CheckpointStateOutputStream createCheckpointStateOutputStream(CheckpointedStateScope scope)
             throws IOException;
+
+    /**
+     * Tells if we can duplicate the given {@link StreamStateHandle} into the path corresponding to
+     * the given {@link CheckpointedStateScope}.
+     *
+     * <p>This should be a rather cheap operation, preferably not involving any remote accesses.
+     *
+     * @param stateHandle The handle to duplicate
+     * @param scope Scope determining the location to duplicate into
+     * @return true, if we can perform the duplication
+     */
+    boolean canFastDuplicate(StreamStateHandle stateHandle, CheckpointedStateScope scope)
+            throws IOException;
+
+    /**
+     * Duplicates {@link StreamStateHandle} into the path corresponding to * the given {@link
+     * CheckpointedStateScope}.
+     *
+     * <p>You should first check if you can duplicate with {@link
+     * #canFastDuplicate(StreamStateHandle, CheckpointedStateScope)}.
+     *
+     * @param stateHandles The handles to duplicate
+     * @param scope Scope determining the location to duplicate into
+     * @return The duplicated handle
+     */
+    List<StreamStateHandle> duplicate(

Review comment:
       I agree the name does not fit in here well. Do you have any suggestions?




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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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[GitHub] [flink] flinkbot edited a comment on pull request #18341: [FLINK-25194] Implement an API for duplicating artefacts

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #18341:
URL: https://github.com/apache/flink/pull/18341#issuecomment-1011007519


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