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https://issues.apache.org/jira/browse/FLINK-7643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16192021#comment-16192021
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ASF GitHub Bot commented on FLINK-7643:
---------------------------------------
Github user bowenli86 commented on a diff in the pull request:
https://github.com/apache/flink/pull/4776#discussion_r142789177
--- Diff:
flink-core/src/main/java/org/apache/flink/core/fs/factories/UnsupportedSchemeFactory.java
---
@@ -0,0 +1,65 @@
+/*
+ * 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.factories;
+
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.core.fs.FileSystem;
+import org.apache.flink.core.fs.FileSystemFactory;
+import org.apache.flink.core.fs.UnsupportedFileSystemSchemeException;
+
+import javax.annotation.Nullable;
+import java.io.IOException;
+import java.net.URI;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * A file system factory to throw an UnsupportedFileSystemSchemeException
when called.
+ */
+public class UnsupportedSchemeFactory implements FileSystemFactory {
--- End diff --
I feel this is unnecessary. We can fail Flink faster and earlier, instead
of having a wait until `create()` is called
> Configure FileSystems only once
> -------------------------------
>
> Key: FLINK-7643
> URL: https://issues.apache.org/jira/browse/FLINK-7643
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Affects Versions: 1.4.0
> Reporter: Ufuk Celebi
> Assignee: Stephan Ewen
>
> HadoopFileSystem always reloads GlobalConfiguration, which potentially leads
> to a lot of noise in the logs, because this happens on each checkpoint.
> Instead, file systems should be configured once upon process startup, when
> the configuration is loaded.
> This will also increase efficiency of checkpoints, as it avoids redundant
> parsing for each data chunk.
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