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new 263cf4e910b [FLINK-38567][state/forst] Adapt ForStFileSystem to dummy
mkdir() implementation (#27223)
263cf4e910b is described below
commit 263cf4e910ba6c958dfd32d4bcf5330178d67c55
Author: AlexYinHan <[email protected]>
AuthorDate: Tue Nov 11 19:01:11 2025 +0800
[FLINK-38567][state/forst] Adapt ForStFileSystem to dummy mkdir()
implementation (#27223)
(cherry picked from commit 498954941b2fc1502fad2c85423b39d0e36649f6)
---
...ForStFileSystemTrackingCreatedDirDecorator.java | 59 ++++++++++++
.../flink/state/forst/fs/ForStFileSystemUtils.java | 84 +++++++++++++++++
.../flink/state/forst/fs/ForStFlinkFileSystem.java | 8 ++
.../state/forst/fs/StringifiedForStFileSystem.java | 2 +-
.../forst/fs/filemapping/FileMappingManager.java | 20 +---
...tFileSystemTrackingCreatedDirDecoratorTest.java | 103 +++++++++++++++++++++
6 files changed, 257 insertions(+), 19 deletions(-)
diff --git
a/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/ForStFileSystemTrackingCreatedDirDecorator.java
b/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/ForStFileSystemTrackingCreatedDirDecorator.java
new file mode 100644
index 00000000000..7d7ba568b2d
--- /dev/null
+++
b/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/ForStFileSystemTrackingCreatedDirDecorator.java
@@ -0,0 +1,59 @@
+/*
+ * 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.state.forst.fs;
+
+import org.apache.flink.core.fs.Path;
+
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * A decorator of {@link ForStFlinkFileSystem} to adapt ForSt to the
underlying FileSystems which
+ * are implemented with incomplete mkdir(), i.e., such FileSystem
implementation does not actually
+ * create the directory when mkdir() completes. This can lead to unexpected
behavior when ForSt
+ * tries to assert the existence of directories by calling exists().
Therefore, we track the paths
+ * of the should-be-created directories and subsequently return true for
existence checks.
+ */
+public class ForStFileSystemTrackingCreatedDirDecorator extends
ForStFlinkFileSystem {
+ private final Set<Path> createdDirPaths = new HashSet<>();
+
+ ForStFileSystemTrackingCreatedDirDecorator(ForStFlinkFileSystem
fileSystem) {
+ super(fileSystem);
+ }
+
+ @Override
+ public synchronized boolean mkdirs(Path path) throws IOException {
+ boolean mkdirSucceed = super.mkdirs(path);
+ if (!mkdirSucceed) {
+ return false;
+ }
+
+ createdDirPaths.add(path);
+ return true;
+ }
+
+ @Override
+ public synchronized boolean exists(final Path f) throws IOException {
+ if (createdDirPaths.contains(f)) {
+ return true;
+ }
+ return super.exists(f);
+ }
+}
diff --git
a/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/ForStFileSystemUtils.java
b/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/ForStFileSystemUtils.java
new file mode 100644
index 00000000000..0674dd56777
--- /dev/null
+++
b/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/ForStFileSystemUtils.java
@@ -0,0 +1,84 @@
+/*
+ * 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.state.forst.fs;
+
+import org.apache.flink.core.fs.Path;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.Nullable;
+
+import java.io.IOException;
+import java.util.UUID;
+
+/** Utils for ForStFileSystem. */
+public class ForStFileSystemUtils {
+ private static final Logger LOG =
LoggerFactory.getLogger(ForStFileSystemUtils.class);
+
+ private static final String DUMMY_DIR_NAME = "_dummy_dir_";
+
+ public static boolean isParentDir(@Nullable Path path, String dir) {
+ if (path == null) {
+ return false;
+ }
+ return isParentDir(path.toString(), dir);
+ }
+
+ public static boolean isParentDir(String path, String dir) {
+ if (dir.isEmpty()) {
+ return false;
+ }
+ if (dir.charAt(dir.length() - 1) == '/') {
+ return path.startsWith(dir);
+ } else {
+ return (path.startsWith(dir + "/"));
+ }
+ }
+
+ public static ForStFlinkFileSystem tryDecorate(ForStFlinkFileSystem
fileSystem) {
+ try {
+ return isIncompleteMkdirEnabled(fileSystem)
+ ? new
ForStFileSystemTrackingCreatedDirDecorator(fileSystem)
+ : fileSystem;
+ } catch (IOException e) {
+ LOG.info("Cannot decorate ForStFlinkFileSystem", e);
+ }
+ return fileSystem;
+ }
+
+ private static boolean isIncompleteMkdirEnabled(ForStFlinkFileSystem
fileSystem)
+ throws IOException {
+ // check if the underlying FileSystem uses an incomplete mkdir
implementation
+ Path dummyDir = new Path(fileSystem.getRemoteBase(), DUMMY_DIR_NAME +
UUID.randomUUID());
+ if (fileSystem.mkdirs(dummyDir)) {
+ if (!fileSystem.exists(dummyDir)) {
+ return true;
+ }
+ fileSystem.delete(new Path(DUMMY_DIR_NAME), true);
+ return false;
+ } else {
+ LOG.info(
+ "Cannot to mkdir for "
+ + DUMMY_DIR_NAME
+ + ", skip decoration of ForStFlinkFileSystem");
+ }
+ return false;
+ }
+}
diff --git
a/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/ForStFlinkFileSystem.java
b/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/ForStFlinkFileSystem.java
index afbc5a71505..1e662a509be 100644
---
a/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/ForStFlinkFileSystem.java
+++
b/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/ForStFlinkFileSystem.java
@@ -89,6 +89,14 @@ public class ForStFlinkFileSystem extends FileSystem
implements Closeable {
this.fileMappingManager = new FileMappingManager(delegateFS,
remoteBase, localBase);
}
+ protected ForStFlinkFileSystem(ForStFlinkFileSystem forStFlinkFileSystem) {
+ this.localFS = forStFlinkFileSystem.localFS;
+ this.delegateFS = forStFlinkFileSystem.delegateFS;
+ this.remoteBase = forStFlinkFileSystem.remoteBase;
+ this.fileBasedCache = forStFlinkFileSystem.fileBasedCache;
+ this.fileMappingManager = forStFlinkFileSystem.fileMappingManager;
+ }
+
/**
* Returns a reference to the {@link FileSystem} instance for accessing
the file system
* identified by the given {@link URI}.
diff --git
a/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/StringifiedForStFileSystem.java
b/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/StringifiedForStFileSystem.java
index 1031a76e735..f0969117827 100644
---
a/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/StringifiedForStFileSystem.java
+++
b/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/StringifiedForStFileSystem.java
@@ -33,7 +33,7 @@ public class StringifiedForStFileSystem {
private ForStFlinkFileSystem fileSystem;
public StringifiedForStFileSystem(ForStFlinkFileSystem fileSystem) {
- this.fileSystem = fileSystem;
+ this.fileSystem = ForStFileSystemUtils.tryDecorate(fileSystem);
}
public static StringifiedForStFileSystem get(String uri) throws
IOException {
diff --git
a/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/filemapping/FileMappingManager.java
b/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/filemapping/FileMappingManager.java
index ca2ff8dbec4..95cbdbdc1a3 100644
---
a/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/filemapping/FileMappingManager.java
+++
b/flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/fs/filemapping/FileMappingManager.java
@@ -37,6 +37,8 @@ import java.util.List;
import java.util.Map;
import java.util.UUID;
+import static org.apache.flink.state.forst.fs.ForStFileSystemUtils.isParentDir;
+
/**
* A manager to manage file mapping of forst file system, including misc file
mapping (remote file
* -> local file) and linked mapping (remote file -> remote file). Note, the
key/value of mapping
@@ -309,24 +311,6 @@ public class FileMappingManager {
return mappingTable.getOrDefault(path, null);
}
- private boolean isParentDir(@Nullable Path path, String dir) {
- if (path == null) {
- return false;
- }
- return isParentDir(path.toString(), dir);
- }
-
- private boolean isParentDir(String path, String dir) {
- if (dir.isEmpty()) {
- return false;
- }
- if (dir.charAt(dir.length() - 1) == '/') {
- return path.startsWith(dir);
- } else {
- return (path.startsWith(dir + "/"));
- }
- }
-
public void giveUpOwnership(Path path, StreamStateHandle stateHandle) {
MappingEntry mappingEntry = mappingTable.getOrDefault(path.toString(),
null);
Preconditions.checkArgument(
diff --git
a/flink-state-backends/flink-statebackend-forst/src/test/java/org/apache/flink/state/forst/fs/ForStFileSystemTrackingCreatedDirDecoratorTest.java
b/flink-state-backends/flink-statebackend-forst/src/test/java/org/apache/flink/state/forst/fs/ForStFileSystemTrackingCreatedDirDecoratorTest.java
new file mode 100644
index 00000000000..20b3bee3afe
--- /dev/null
+++
b/flink-state-backends/flink-statebackend-forst/src/test/java/org/apache/flink/state/forst/fs/ForStFileSystemTrackingCreatedDirDecoratorTest.java
@@ -0,0 +1,103 @@
+/*
+ * 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.state.forst.fs;
+
+import org.apache.flink.core.fs.local.LocalFileSystem;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/** Tests for {@link ForStFileSystemTrackingCreatedDirDecorator}. */
+public class ForStFileSystemTrackingCreatedDirDecoratorTest {
+ @TempDir static Path tempDir;
+
+ private static class MockLocalFileSystem extends LocalFileSystem {
+ private final boolean dummyMkdirEnabled;
+
+ public MockLocalFileSystem(boolean dummyMkdirEnabled) {
+ super();
+ this.dummyMkdirEnabled = dummyMkdirEnabled;
+ }
+
+ @Override
+ public synchronized boolean mkdirs(org.apache.flink.core.fs.Path path)
throws IOException {
+ if (dummyMkdirEnabled) {
+ return true;
+ } else {
+ return super.mkdirs(path);
+ }
+ }
+ }
+
+ @Test
+ public void testMkdirAndCheck() throws IOException {
+ mkdirAndCheck(false);
+ }
+
+ @Test
+ public void testDummyMkdirAndCheck() throws IOException {
+ mkdirAndCheck(true);
+ }
+
+ void mkdirAndCheck(boolean enableDummyMkdir) throws IOException {
+ org.apache.flink.core.fs.Path remotePath =
+ new org.apache.flink.core.fs.Path(tempDir.toString() +
"/remote");
+ org.apache.flink.core.fs.Path localPath =
+ new org.apache.flink.core.fs.Path(tempDir.toString() +
"/local");
+
+ MockLocalFileSystem mockLocalFileSystem = new
MockLocalFileSystem(enableDummyMkdir);
+ ForStFlinkFileSystem fileSystem =
+ ForStFileSystemUtils.tryDecorate(
+ new ForStFlinkFileSystem(
+ mockLocalFileSystem,
+ remotePath.toString(),
+ localPath.toString(),
+ null));
+ if (enableDummyMkdir) {
+
assertThat(fileSystem).isInstanceOf(ForStFileSystemTrackingCreatedDirDecorator.class);
+ }
+
+ // create a directory
+ String dirPathStr = genRandomFilePathStr();
+ org.apache.flink.core.fs.Path testMkdirPath = new
org.apache.flink.core.fs.Path(dirPathStr);
+ fileSystem.mkdirs(testMkdirPath);
+
assertThat(mockLocalFileSystem.exists(testMkdirPath)).isEqualTo(!enableDummyMkdir);
+ assertThat(fileSystem.exists(testMkdirPath)).isTrue();
+
+ // create sub directories
+ for (int i = 0; i < 10; i++) {
+ String subDirName = UUID.randomUUID().toString();
+ org.apache.flink.core.fs.Path testSubMkdirPath =
+ new org.apache.flink.core.fs.Path(dirPathStr, subDirName);
+ fileSystem.mkdirs(testSubMkdirPath);
+
assertThat(mockLocalFileSystem.exists(testSubMkdirPath)).isEqualTo(!enableDummyMkdir);
+ assertThat(fileSystem.exists(testSubMkdirPath)).isTrue();
+ }
+ }
+
+ private String genRandomFilePathStr() {
+ return tempDir.toString() + "/" + UUID.randomUUID();
+ }
+}
