[DO NOT USE] Add data model and initial implementation for backup

.github/dist-management.diff

@@ -0,0 +1,18 @@
+diff --git a/pom.xml b/pom.xml
+index b8c0d9a9d..7c2674e63 100755
+--- a/pom.xml
++++ b/pom.xml
+@@ -920,5 +920,12 @@
+       </plugin>
+     </plugins>
+   </reporting>
+-
++  
++  <distributionManagement>
++    <repository>
++      <id>bintray-linkedin-maven</id>
++      <name>linkedin-maven</name>
++      <url>https://api.bintray.com/maven/linkedin/maven/zookeeper/;publish=1;override=1</url>
++    </repository>
++  </distributionManagement>
+ </project>

.github/workflows/ci-bintray-workflow.yml

@@ -0,0 +1,49 @@
+#
+## 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.
+##
+name: Publish to Bintray
+
+on:
+  release:
+    branches:
+      - 'li-dev/**'
+    types: [published]
+jobs:
+  deploy:
+    name: deploy
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Extract branch name
+      shell: bash
+      run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF##*/})"
+      id: extract_branch
+    - name: Update the version
+      run: |
+        sh .github/workflows/version-upgrade.sh ${{ steps.extract_branch.outputs.branch }}
+    - name: Build with Maven
+      run: |
+        mvn clean deploy -DskipTests -s .github/workflows/settings.xml -DretryFailedDeploymentCount=3
+      env:
+        MVN_DEPLOY_BINTRAY_KEY: ${{ secrets.MVN_DEPLOY_BINTRAY_KEY }}
+        MVN_DEPLOY_BINTRAY_USER: ${{ secrets.MVN_DEPLOY_BINTRAY_USER }}
+

.github/workflows/settings.xml

@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+         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.
+-->
+<settings xsi:schemaLocation='http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd'
+          xmlns='http://maven.apache.org/SETTINGS/1.0.0' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'>
+
+<!-- Resolve arficacts -->
+  <profiles>
+    <profile>
+      <repositories>
+        <repository>
+          <snapshots>
+            <enabled>
+              false
+            </enabled>
+          </snapshots>
+          <id>
+            bintray-linkedin-maven
+          </id>
+          <name>
+            bintray
+          </name>
+          <url>
+            https://linkedin.bintray.com/maven
+          </url>
+        </repository>
+      </repositories>
+      <pluginRepositories>
+        <pluginRepository>
+          <snapshots>
+            <enabled>
+              false
+            </enabled>
+          </snapshots>
+          <id>
+            bintray-linkedin-maven
+          </id>
+          <name>
+            bintray-plugins
+          </name>
+          <url>
+            https://linkedin.bintray.com/maven
+          </url>
+        </pluginRepository>
+      </pluginRepositories>
+      <id>
+        bintray
+      </id>
+    </profile>
+  </profiles>
+  <activeProfiles>
+    <activeProfile>
+      bintray
+    </activeProfile>
+  </activeProfiles>
+
+<!-- Bintray credentials - env vars are secrets that come from linkedin/zookeeper repo secrets -->
+  <servers>
+    <server>
+      <id>bintray-linkedin-maven</id>
+      <username>${env.MVN_DEPLOY_BINTRAY_USER}</username>
+      <password>${env.MVN_DEPLOY_BINTRAY_KEY}</password>
+    </server>
+  </servers>
+</settings>

.github/workflows/version-upgrade.sh

@@ -0,0 +1,52 @@
+#!/bin/sh
+
+#
+# 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.
+#
+
+# Enable below when using locally/manually
+# cd ../../
+
+echo There are $# arguments to $0: $*
+if [ "$#" -eq 2 ]; then
+  version=$1
+  new_version=$2
+else
+  version=`grep -A 4 "<groupId>com.linkedin.zookeeper</groupId>" pom.xml | grep "<version>" | awk 'BEGIN {FS="[<,>]"};{print $3}'`  
+
+# just use the given version as the new version
+  new_version=$1
+
+# Below version upgrade logic is left here just in case
+
+#  minor_version=`echo $version | cut -d'.' -f3`
+#  major_version=`echo $version | cut -d'.' -f1` # should be 0
+#  submajor_version=`echo $version | cut -d'.' -f2`
+
+#  new_minor_version=`expr $minor_version + 1`
+#  new_version=`echo $version | sed -e "s/${minor_version}/${new_minor_version}/g"`
+#  new_version="$major_version.$submajor_version.$new_minor_version"
+fi
+echo "bump up: $version -> $new_version"
+
+for MODULE in $(find . -name 'pom.xml')
+do 
+  echo "bump up $MODULE"
+  sed -i "s/${version}/${new_version}/g" $MODULE
+  grep -C 1 "$new_version" $MODULE
+done

.gitignore

@@ -9,7 +9,6 @@ zookeeper-server/version-2/*
 # SVN
 .svn
 .revision
-git.properties
 
 # Eclipse
 .metadata

Jenkinsfile

@@ -0,0 +1,79 @@
+/*
+ * 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.
+ */
+
+pipeline {
+    agent {
+        label 'Hadoop'
+    }
+
+    options {
+        disableConcurrentBuilds()
+        buildDiscarder(logRotator(daysToKeepStr: '14'))
+        timeout(time: 2, unit: 'HOURS')
+        timestamps()
+    }
+
+    triggers {
+        cron('@daily')
+    }
+
+    stages {
+        stage('Prepare') {
+            matrix {
+                agent any
+                axes {
+                    axis {
+                        name 'JAVA_VERSION'
+                        values 'JDK 1.8 (latest)', 'JDK 11 (latest)'
+                    }
+                }
+
+                tools {
+                    maven "Maven (latest)"
+                    jdk "${JAVA_VERSION}"
+                }
+
+                stages {
+                    stage('BuildAndTest') {
+                        steps {
+                            git 'https://github.com/apache/zookeeper'
+                            sh "git clean -fxd"
+                            sh "mvn verify spotbugs:check checkstyle:check -Pfull-build -Dsurefire-forkcount=4"
+                        }
+                        post {
+                            always {
+                               junit '**/target/surefire-reports/TEST-*.xml'
+                               archiveArtifacts '**/target/*.jar'
+                            }
+                            // Jenkins pipeline jobs fill slaves on PRs without this :(
+                            cleanup() {
+                                script {
+                                    sh label: 'Cleanup workspace', script: '''
+                                        # See HADOOP-13951
+                                        chmod -R u+rxw "${WORKSPACE}"
+                                        '''
+                                    deleteDir()
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

Jenkinsfile-PreCommit

@@ -0,0 +1,63 @@
+/*
+ * 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.
+ */
+
+pipeline {
+    agent {
+        label 'Hadoop'
+    }
+
+    options {
+        disableConcurrentBuilds()
+        buildDiscarder(logRotator(daysToKeepStr: '14'))
+        timeout(time: 2, unit: 'HOURS')
+        timestamps()
+    }
+
+    tools {
+        maven "Maven (latest)"
+        jdk "JDK 1.8 (latest)"
+    }
+
+    stages {
+        stage('BuildAndTest') {
+            steps {
+                git 'https://github.com/apache/zookeeper'
+                sh "git clean -fxd"
+                sh "mvn verify spotbugs:check checkstyle:check -Pfull-build -Dsurefire-forkcount=4"
+            }
+            post {
+                always {
+                   junit '**/target/surefire-reports/TEST-*.xml'
+                }
+            }
+        }
+    }
+
+    post {
+        // Jenkins pipeline jobs fill slaves on PRs without this :(
+        cleanup() {
+            script {
+                sh label: 'Cleanup workspace', script: '''
+                    # See HADOOP-13951
+                    chmod -R u+rxw "${WORKSPACE}"
+                    '''
+                deleteDir()
+            }
+        }
+    }
+}

NOTICE.txt

@@ -1,5 +1,5 @@
 Apache ZooKeeper
-Copyright 2009-2014 The Apache Software Foundation
+Copyright 2009-2020 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

README.md

@@ -35,6 +35,11 @@ is voted on and approved by the Apache ZooKeeper PMC:
 
   https://repo1.maven.org/maven2/org/apache/zookeeper/zookeeper/
 
+## Java 8
+
+If you are going to compile with Java 1.8, you should use a
+recent release at u211 or above.
+
 # Contributing
 We always welcome new contributors to the project! See [How to Contribute](https://cwiki.apache.org/confluence/display/ZOOKEEPER/HowToContribute) for details on how to submit patch through pull request and our contribution workflow.
 

README_packaging.md

@@ -19,11 +19,11 @@ yum install python-setuptools
 yum install openssl openssl-devel
 ```
 
-On Ubuntu:
+On Ubuntu (in case of 16.4+):
 
 ```
-apt-get install cppunit
-apt-get install python-setuptools
+apt-get install libcppunit-dev
+apt-get install python-setuptools python2.7-dev
 apt-get install openssl libssl-dev
 ```