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+<!---
+  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.
+-->
+
+# Conda Forge recipes
+
+This directory must be migrated periodically with the upstrem updates of
+[arrow-cpp-feedstock][arrow-cpp-feedstock],
+[parquet-cpp-feedstock][parquet-cpp-feedstock].
+conda-forge repositories because of multiple vendored files.
+
+## Keeping the recipes synchronized
+
+The recipes here are tested on nightly basis, so they follow the development
+versions of arrow instead of the upstream recipes, which are suitable for the
+latest releases.
+
+### Backporting from the upstream feedstocks
+
+In most of the cases these recipes are more accurate, then the upstream
+feedstocks. Although the upstream feedstocks regularly receive automatic updates
+by the conda-forge team so we need to backport those changes to the crossbow
+recipes. Most of these updates are touching the version pinning files
+(under `.ci_support`) and other CI related configuration files.
+
+Because all three recipes must be built in the same continuous integration
+job prefer porting from the [arrpw-cpp feedstock][arrow-cpp-feedstock].
+
+#### Updating the variants:
+
+Copy the configuration files from `arrow-cpp-feedstock/.ci_support` to the
+`.ci_support` folder.
+
+#### Updating the CI configurations:
+
+The `.azure-pipelines/azure-pipelines-[linux|osx|win].yml` should be ported
+to the local counterparts under `.azure-pipelines` with keeping the crossbow
+related parts (the cloning of arrow and the jinja templated variables) and
+moving the matrix definitions like [this][matrix-definition] to the crossbow
+[tasks.yml][../tasks.yml] config file.
+
+
+### Porting recipes from crossbow to the upstream feedstocks
+
+Theoretically these recipes should be up to date with the actual version of
+Arrow, so during the release procedure the content of these recipes should be
+copied to the upstream feedstocks.
+
+
+[arrow-cpp-feedstock]: https://github.com/conda-forge/arrow-cpp-feedstock
+[parquet-cpp-feedstock]: https://github.com/conda-forge/parquet-cpp-feedstock
+[matrix-definition]: https://github.com/conda-forge/arrow-cpp-feedstock/blob/master/.azure-pipelines/azure-pipelines-linux.yml#L12