Add a fallback repository as GCS

Author: HyukjinKwon

.github/workflows/master.yml

@@ -66,14 +66,6 @@ jobs:
         export MAVEN_OPTS="-Xmx2g -XX:ReservedCodeCacheSize=1g -Dorg.slf4j.simpleLogger.defaultLogLevel=WARN"
         export MAVEN_CLI_OPTS="--no-transfer-progress"
         mkdir -p ~/.m2
-        # `Maven Central` is too flaky in terms of downloading artifacts in `GitHub Action` environment.
-        # `Google Maven Central Mirror` is too slow in terms of sycing upstream. To get the best combination,
-        #   1) we set `Google Maven Central` as a mirror of `central` in `GitHub Action` environment only.
-        #   2) we duplicates `Maven Central` in pom.xml with ID `central_without_mirror`.
-        # In other words, in GitHub Action environment, `central` is mirrored by `Google Maven Central` first.
-        # If `Google Maven Central` doesn't provide the artifact due to its slowness, `central_without_mirror` will be used.
-        # Note that we aim to achieve the above while keeping the existing behavior of non-`GitHub Action` environment unchanged.
-        echo "<settings><mirrors><mirror><id>google-maven-central</id><name>GCS Maven Central mirror</name><url>https://maven-central.storage-download.googleapis.com/repos/central/data/</url><mirrorOf>central</mirrorOf></mirror></mirrors></settings>" > ~/.m2/settings.xml
         ./build/mvn $MAVEN_CLI_OPTS -DskipTests -Pyarn -Pmesos -Pkubernetes -Phive -P${{ matrix.hive }} -Phive-thriftserver -P${{ matrix.hadoop }} -Phadoop-cloud -Djava.version=${{ matrix.java }} install
         rm -rf ~/.m2/repository/org/apache/spark
 

pom.xml

@@ -258,14 +258,12 @@
       </snapshots>
     </repository>
     <repository>
-      <id>central_without_mirror</id>
+      <id>google-maven-central</id>
       <!--
         This is used as a fallback when a mirror to `central` fail.
-        For example, when we use Google Maven Central in GitHub Action as a mirror of `central`,
-        this will be used when Google Maven Central is out of sync due to its late sync cycle.
       -->
-      <name>Maven Repository</name>
-      <url>https://repo.maven.apache.org/maven2</url>
+      <name>GCS Maven Central mirror</name>
+      <url>https://maven-central.storage-download.googleapis.com/repos/central/data</url>
       <releases>
         <enabled>true</enabled>
       </releases>
@@ -285,6 +283,17 @@
         <enabled>false</enabled>
       </snapshots>
     </pluginRepository>
+    <pluginRepository>
+      <id>google-maven-central</id>
+      <name>GCS Maven Central mirror</name>
+      <url>https://maven-central.storage-download.googleapis.com/repos/central/data</url>
+      <releases>
+        <enabled>true</enabled>
+      </releases>
+      <snapshots>
+        <enabled>false</enabled>
+      </snapshots>
+    </pluginRepository>
   </pluginRepositories>
   <dependencies>
     <!--