diff --git a/dev-support/README.md b/dev-support/README.md
new file mode 100644
index 00000000000..b2e34768387
--- /dev/null
+++ b/dev-support/README.md
@@ -0,0 +1,57 @@
+<!--
+  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.
+-->
+
+This directory contains tools to help in the development and release of Apache Hadoop.
+
+* bin
+
+  * releasedocmaker
+
+    Build release notes for a given Hadoop project or subproject.  This is called from Maven when -Preleasedocs is used.  See BUILDING.txt for more information.
+
+  * shelldocs
+
+    Create documentation for the Unix Shell API.  This is called from Maven when -Pshelldocs is used.
+
+  * smart-apply-patch
+
+    Intelligently apply a patch file to a source tree.
+
+  * test-patch
+
+    Test a patch against a source tree.
+
+* create-release.sh
+
+  Helps REs create a release of Apache Hadoop for distribution.
+
+* determine-flaky-tests-hadoop.py
+
+  Given a jenkins test job, this script examines all runs of the job done within specified period of time (number of days prior to the execution time of this script), and reports all failed tests.
+
+* docker
+
+  Various helpers for the start-build-env.sh script, including the Dockerfile itself. See parent BUILDING.txt for more information.
+
+* findHangingTest.sh
+
+  Finds hanging test from Jenkins build output.
+
+
+Previously, the scripts test-patch.sh, smart-apply-patch.sh, releasedocmaker.py, and shelldocs.py were in this directory.  They have been moved to the Apache Yetus project (https://yetus.apache.org).  These scripts have been replaced with wrapper scripts located in the bin directory. Command line options are generally different than the previous versions that shipped with older versions of Apache Hadoop.
+
+The wrapper scripts will download, verify (if GPG is installed), and cache a local copy of Apache Yetus in the hadoop/patchprocess directory. The version that is used may be overridden by setting the HADOOP\_YETUS\_VERSION environment variable.  The cache directory may be overwritten by setting the HADOOP\_PATCHPROCESS directory.  If a local version of Apache Yetus is already installed, it may be used instead by setting the YETUS\_HOME environment variable to point to that directory.
\ No newline at end of file
diff --git a/dev-support/bin/releasedocmaker b/dev-support/bin/releasedocmaker
new file mode 100755
index 00000000000..16e4c7efb94
--- /dev/null
+++ b/dev-support/bin/releasedocmaker
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# 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.
+
+BINDIR=$(cd -P -- "$(dirname -- "${BASH_SOURCE-0}")" >/dev/null && pwd -P)
+exec "${BINDIR}/yetus-wrapper" releasedocmaker "$@"
diff --git a/dev-support/bin/shelldocs b/dev-support/bin/shelldocs
new file mode 100755
index 00000000000..18eda4d9c46
--- /dev/null
+++ b/dev-support/bin/shelldocs
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+BINDIR=$(cd -P -- "$(dirname -- "${BASH_SOURCE-0}")" >/dev/null && pwd -P)
+exec "${BINDIR}/yetus-wrapper" shelldocs "$@"
diff --git a/dev-support/bin/smart-apply-patch b/dev-support/bin/smart-apply-patch
new file mode 100755
index 00000000000..3fd469f3879
--- /dev/null
+++ b/dev-support/bin/smart-apply-patch
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# 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.
+
+BINDIR=$(cd -P -- "$(dirname -- "${BASH_SOURCE-0}")" >/dev/null && pwd -P)
+exec "${BINDIR}/yetus-wrapper" smart-apply-patch --project=hadoop "$@"
diff --git a/dev-support/bin/test-patch b/dev-support/bin/test-patch
new file mode 100755
index 00000000000..8ff8119b3e0
--- /dev/null
+++ b/dev-support/bin/test-patch
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+BINDIR=$(cd -P -- "$(dirname -- "${BASH_SOURCE-0}")" >/dev/null && pwd -P)
+exec "${BINDIR}/yetus-wrapper" test-patch --project=hadoop --skip-dir=dev-support "$@"
diff --git a/dev-support/bin/yetus-wrapper b/dev-support/bin/yetus-wrapper
new file mode 100755
index 00000000000..37082d894ac
--- /dev/null
+++ b/dev-support/bin/yetus-wrapper
@@ -0,0 +1,175 @@
+#!/usr/bin/env bash
+# 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.
+
+set -o pipefail
+
+## @description  Print a message to stderr
+## @audience     public
+## @stability    stable
+## @replaceable  no
+## @param        string
+function yetus_error
+{
+  echo "$*" 1>&2
+}
+
+## @description  Given a filename or dir, return the absolute version of it
+## @audience     public
+## @stability    stable
+## @param        directory
+## @replaceable  no
+## @return       0 success
+## @return       1 failure
+## @return       stdout abspath
+function yetus_abs
+{
+  declare obj=$1
+  declare dir
+  declare fn
+
+  if [[ ! -e ${obj} ]]; then
+    return 1
+  elif [[ -d ${obj} ]]; then
+    dir=${obj}
+  else
+    dir=$(dirname -- "${obj}")
+    fn=$(basename -- "${obj}")
+    fn="/${fn}"
+  fi
+
+  dir=$(cd -P -- "${dir}" >/dev/null 2>/dev/null && pwd -P)
+  if [[ $? = 0 ]]; then
+    echo "${dir}${fn}"
+    return 0
+  fi
+  return 1
+}
+
+
+WANTED="$1"
+shift
+ARGV=("$@")
+
+HADOOP_YETUS_VERSION=${HADOOP_YETUS_VERSION:-0.1.0}
+BIN=$(yetus_abs "${BASH_SOURCE-$0}")
+BINDIR=$(dirname "${BIN}")
+
+###
+###  if YETUS_HOME is set, then try to use it
+###
+if [[ -n "${YETUS_HOME}"
+   && -x "${YETUS_HOME}/bin/${WANTED}" ]]; then
+  exec "${YETUS_HOME}/bin/${WANTED}" "${ARGV[@]}"
+fi
+
+#
+# this directory is ignored by git and maven
+#
+HADOOP_PATCHPROCESS=${HADOOP_PATCHPROCESS:-"${BINDIR}/../../patchprocess"}
+
+if [[ ! -d "${HADOOP_PATCHPROCESS}" ]]; then
+  mkdir -p "${HADOOP_PATCHPROCESS}"
+fi
+
+mytmpdir=$(yetus_abs "${HADOOP_PATCHPROCESS}")
+if [[ $? != 0 ]]; then
+  yetus_error "yetus-dl: Unable to cwd to ${HADOOP_PATCHPROCESS}"
+  exit 1
+fi
+HADOOP_PATCHPROCESS=${mytmpdir}
+
+##
+## if we've already DL'd it, then short cut
+##
+if [[ -x "${HADOOP_PATCHPROCESS}/yetus-${HADOOP_YETUS_VERSION}/bin/${WANTED}" ]]; then
+  exec "${HADOOP_PATCHPROCESS}/yetus-${HADOOP_YETUS_VERSION}/bin/${WANTED}" "${ARGV[@]}"
+fi
+
+##
+## need to DL, etc
+##
+
+BASEURL="https://dist.apache.org/repos/dist/release/yetus/${HADOOP_YETUS_VERSION}/"
+TARBALL="yetus-${HADOOP_YETUS_VERSION}-bin.tar"
+
+GPGBIN=$(command -v gpg)
+CURLBIN=$(command -v curl)
+
+pushd "${HADOOP_PATCHPROCESS}" >/dev/null
+if [[ $? != 0 ]]; then
+  yetus_error "ERROR: yetus-dl: Cannot pushd to ${HADOOP_PATCHPROCESS}"
+  exit 1
+fi
+
+if [[ -n "${CURLBIN}" ]]; then
+  "${CURLBIN}" -s -L -O "${BASEURL}/${TARBALL}.gz"
+  if [[ $? != 0 ]]; then
+    yetus_error "ERROR: yetus-dl: unable to download ${BASEURL}/${TARBALL}.gz"
+    exit 1
+  fi
+else
+  yetus_error "ERROR: yetus-dl requires curl."
+  exit 1
+fi
+
+if [[ -n "${GPGBIN}" ]]; then
+  mkdir -p .gpg
+  if [[ $? != 0 ]]; then
+    yetus_error "ERROR: yetus-dl: Unable to create ${HADOOP_PATCHPROCESS}/.gpg"
+    exit 1
+  fi
+  chmod -R 700 .gpg
+  if [[ $? != 0 ]]; then
+    yetus_error "ERROR: yetus-dl: Unable to chmod ${HADOOP_PATCHPROCESS}/.gpg"
+    exit 1
+  fi
+  "${CURLBIN}" -s -L -o KEYS_YETUS https://dist.apache.org/repos/dist/release/yetus/KEYS
+  if [[ $? != 0 ]]; then
+    yetus_error "ERROR: yetus-dl: unable to fetch https://dist.apache.org/repos/dist/release/yetus/KEYS"
+    exit 1
+  fi
+  "${CURLBIN}" -s -L -O "${BASEURL}/${TARBALL}.gz.asc"
+  if [[ $? != 0 ]]; then
+    yetus_error "ERROR: yetus-dl: unable to fetch ${BASEURL}/${TARBALL}.gz.asc"
+    exit 1
+  fi
+  "${GPGBIN}" --homedir "${HADOOP_PATCHPROCESS}/.gpg" --import "${HADOOP_PATCHPROCESS}/KEYS_YETUS" >/dev/null 2>&1
+  if [[ $? != 0 ]]; then
+    yetus_error "ERROR: yetus-dl: gpg unable to import ${HADOOP_PATCHPROCESS}/KEYS_YETUS"
+    exit 1
+  fi
+  "${GPGBIN}" --homedir "${HADOOP_PATCHPROCESS}/.gpg" --verify "${TARBALL}.gz.asc" >/dev/null 2>&1
+   if [[ $? != 0 ]]; then
+     yetus_error "ERROR: yetus-dl: gpg verify of tarball in ${HADOOP_PATCHPROCESS} failed"
+     exit 1
+   fi
+fi
+
+gunzip -c "${TARBALL}.gz" | tar xpf -
+if [[ $? != 0 ]]; then
+  yetus_error "ERROR: ${TARBALL}.gz is corrupt. Investigate and then remove ${HADOOP_PATCHPROCESS} to try again."
+  exit 1
+fi
+
+if [[ -x "${HADOOP_PATCHPROCESS}/yetus-${HADOOP_YETUS_VERSION}/bin/${WANTED}" ]]; then
+  exec "${HADOOP_PATCHPROCESS}/yetus-${HADOOP_YETUS_VERSION}/bin/${WANTED}" "${ARGV[@]}"
+fi
+
+##
+## give up
+##
+yetus_error "ERROR: ${WANTED} is not part of Apache Yetus ${HADOOP_YETUS_VERSION}"
+exit 1