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https://issues.apache.org/jira/browse/FLINK-5788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15865603#comment-15865603
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ASF GitHub Bot commented on FLINK-5788:
---------------------------------------
Github user alpinegizmo commented on a diff in the pull request:
https://github.com/apache/flink/pull/3301#discussion_r101010804
--- Diff: docs/internals/filesystems.md ---
@@ -0,0 +1,138 @@
+---
+title: "File Systems"
+nav-parent_id: internals
+nav-pos: 10
+---
+<!--
+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.
+-->
+
+* Replaced by the TOC
+{:toc}
+
+Flink has its own file system abstraction via the
`org.apache.flink.core.fs.FileSystem` class.
+This abstraction provides a common set of operations and minimal
guarantees across various types
+of file system implementations.
+
+The `FileSystem`'s set of available operations is quite limited, in order
to suport a wide
--- End diff --
support
> Document assumptions about File Systems and persistence
> -------------------------------------------------------
>
> Key: FLINK-5788
> URL: https://issues.apache.org/jira/browse/FLINK-5788
> Project: Flink
> Issue Type: Improvement
> Components: Documentation
> Reporter: Stephan Ewen
> Assignee: Stephan Ewen
> Fix For: 1.3.0
>
>
> We should add some description about the assumptions we make for the behavior
> of {{FileSystem}} implementations to support proper checkpointing and
> recovery operations.
> This is especially critical for file systems like {{S3}} with a somewhat
> tricky contract.
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