1. Use ubuntu:20.04 base image for Pulsar docker images

2. Build python client by Python3.8

cherry-pick:
1. apache#11026
2. apache#11623
3. apache#11862

docker/pulsar-standalone/Dockerfile

@@ -24,16 +24,21 @@ FROM apachepulsar/pulsar-all:latest as pulsar
 FROM apachepulsar/pulsar-dashboard:latest as dashboard
 
 # Restart from
-FROM openjdk:8-jdk
+FROM ubuntu:20.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update \
+    && apt-get -y install wget gnupg && wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -
+RUN bash -c "echo deb http://apt.postgresql.org/pub/repos/apt/ focal-pgdg main >> /etc/apt/sources.list.d/pgdg.list"
 
 # Note that the libpq-dev package is needed here in order to install
 # the required python psycopg2 package (for postgresql) later
 RUN apt-get update \
-    && apt-get -y install python3.7 python3.7-dev python3-pip postgresql sudo nginx supervisor libpq-dev
+    && apt-get -y install openjdk-11-jdk-headless python3 python3-dev python3-pip postgresql-11 sudo nginx supervisor libpq-dev
 
 RUN update-alternatives --install /usr/bin/python python /usr/bin/python3 10
 RUN update-ca-certificates
-RUN ln -s /usr/bin/pip3 /usr/bin/pip
 
 # Postgres configuration
 COPY --from=dashboard /etc/postgresql/11/main/postgresql.conf /etc/postgresql/11/main/postgresql.conf
@@ -73,7 +78,7 @@ RUN pip install -r /pulsar/django/requirements.txt
 COPY --from=dashboard /pulsar/init-postgres.sh /pulsar/django/init-postgres.sh
 RUN mkdir /data
 RUN /pulsar/django/init-postgres.sh
-RUN sudo -u postgres /etc/init.d/postgresql stop 
+RUN sudo -u postgres /etc/init.d/postgresql stop
 # Add postgresql to supervisord. Redirect logs to stdout
 RUN echo "\n[program:postgresql]\n\
 command = /etc/init.d/postgresql start\n\

docker/pulsar/Dockerfile

@@ -32,13 +32,15 @@ COPY scripts/generate-zookeeper-config.sh /pulsar/bin
 COPY scripts/pulsar-zookeeper-ruok.sh /pulsar/bin
 COPY scripts/watch-znode.py /pulsar/bin
 COPY scripts/set_python_version.sh /pulsar/bin
-COPY scripts/install-pulsar-client-37.sh /pulsar/bin
+COPY scripts/install-pulsar-client.sh /pulsar/bin
 
 
-### Create 2nd stage from OpenJDK image
-### and add Python dependencies (for Pulsar functions)
+### Create 2nd stage from Ubuntu image
+### and add OpenJDK and Python dependencies (for Pulsar functions)
 
-FROM openjdk:8-jdk-slim
+FROM ubuntu:20.04
+
+ARG DEBIAN_FRONTEND=noninteractive
 
 # Install software-properties-common
 RUN apt update \
@@ -47,21 +49,25 @@ RUN apt update \
 
 # Install some utilities
 RUN apt-get update \
-     && apt-get install -y netcat dnsutils less procps iputils-ping \
-                 python3.7 python3.7-dev python3-setuptools python3-yaml python3-kazoo \
+     && apt-get -y dist-upgrade \
+     && apt-get -y install openjdk-11-jdk-headless netcat dnsutils less procps iputils-ping \
+                 python3 python3-dev python3-setuptools python3-yaml python3-kazoo \
                  libreadline-gplv2-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev \
                  curl \
+     && apt-get -y --purge autoremove \
+     && apt-get autoclean \
      && apt-get clean \
      && rm -rf /var/lib/apt/lists/*
 
 RUN curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
-RUN python3.7 get-pip.py
+RUN python3 get-pip.py
 
 RUN update-alternatives --install /usr/bin/python python /usr/bin/python3 10
 
 ADD target/python-client/ /pulsar/pulsar-client
 ADD target/cpp-client/ /pulsar/cpp-client
-RUN echo networkaddress.cache.ttl=1 >> $JAVA_HOME/jre/lib/security/java.security
+ENV JAVA_HOME /usr/lib/jvm/java-11-openjdk-amd64
+RUN echo networkaddress.cache.ttl=1 >> /usr/lib/jvm/java-11-openjdk-amd64/conf/security/java.security
 RUN apt-get update \
      && apt install -y /pulsar/cpp-client/*.deb \
      && apt-get clean \
@@ -75,4 +81,4 @@ ENV PULSAR_ROOT_LOGGER=INFO,CONSOLE
 COPY --from=pulsar /pulsar /pulsar
 WORKDIR /pulsar
 
-RUN /pulsar/bin/install-pulsar-client-37.sh
+RUN /pulsar/bin/install-pulsar-client.sh

docker/pulsar/pom.xml

@@ -63,8 +63,8 @@
                   <workingDirectory>${project.basedir}/target</workingDirectory>
                   <executable>${project.basedir}/../../pulsar-client-cpp/docker/build-wheels.sh</executable>
                   <arguments>
-                    <!-- build python 3.7 -->
-                    <argument>3.7 cp37-cp37m</argument>
+                    <!-- build python 3.8 -->
+                    <argument>3.8 cp38-cp38</argument>
                   </arguments>
                 </configuration>
               </execution>

docker/pulsar/scripts/install-pulsar-client.sh

@@ -0,0 +1,25 @@
+#!/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 -x
+
+PYTHON_MAJOR_MINOR=$(python3 -V | sed -E 's/.* ([[:digit:]]+)\.([[:digit:]]+).*/\1\2/')
+WHEEL_FILE=$(ls /pulsar/pulsar-client | grep "cp${PYTHON_MAJOR_MINOR}")
+pip3 install /pulsar/pulsar-client/${WHEEL_FILE}[all]