HADOOP-17402. Add GCS config to the core-site (#2638)

Contributed by Rafal Wojdyla

hadoop-common-project/hadoop-common/src/main/resources/core-default.xml

@@ -685,6 +685,9 @@
       fs.azure.account.key.*
       fs.azure.oauth2.*
       fs.adl.oauth2.*
+      fs.gs.encryption.*
+      fs.gs.proxy.*
+      fs.gs.auth.*
       credential$
       oauth.*secret
       oauth.*password
@@ -1071,6 +1074,15 @@
   </description>
 </property>
 
+<property>
+  <name>fs.viewfs.overload.scheme.target.gs.impl</name>
+  <value>com.google.cloud.hadoop.fs.gcs.GoogleHadoopFS</value>
+  <description>The GoogleHadoopFS/Google Cloud Storage file system for view
+   file system overload scheme when child file system and ViewFSOverloadScheme's
+   schemes are gs.
+  </description>
+</property>
+
 <property>
   <name>fs.viewfs.overload.scheme.target.https.impl</name>
   <value>org.apache.hadoop.fs.http.HttpsFileSystem</value>
@@ -2264,6 +2276,13 @@
     This setting provides better performance compared to blob-specific saskeys.
   </description>
 </property>
+
+<property>
+  <name>fs.AbstractFileSystem.gs.impl</name>
+  <value>com.google.cloud.hadoop.fs.gcs.GoogleHadoopFS</value>
+  <description>The AbstractFileSystem for gs: uris.</description>
+</property>
+
 <property>
   <name>io.seqfile.compress.blocksize</name>
   <value>1000000</value>

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestCommonConfigurationFields.java

@@ -117,7 +117,6 @@ public class TestCommonConfigurationFields extends TestConfigurationFieldsBase {
     xmlPrefixToSkipCompare.add("fs.abfs.impl");
     xmlPrefixToSkipCompare.add("fs.abfss.impl");
 
-
     // ADL properties are in a different subtree
     // - org.apache.hadoop.hdfs.web.ADLConfKeys
     xmlPrefixToSkipCompare.add("adl.");
@@ -130,6 +129,7 @@ public class TestCommonConfigurationFields extends TestConfigurationFieldsBase {
     xmlPropsToSkipCompare.add("fs.viewfs.overload.scheme.target.abfss.impl");
     xmlPropsToSkipCompare.add("fs.viewfs.overload.scheme.target.file.impl");
     xmlPropsToSkipCompare.add("fs.viewfs.overload.scheme.target.ftp.impl");
+    xmlPropsToSkipCompare.add("fs.viewfs.overload.scheme.target.gs.impl");
     xmlPropsToSkipCompare.add("fs.viewfs.overload.scheme.target.hdfs.impl");
     xmlPropsToSkipCompare.add("fs.viewfs.overload.scheme.target.http.impl");
     xmlPropsToSkipCompare.add("fs.viewfs.overload.scheme.target.https.impl");
@@ -139,9 +139,9 @@ public class TestCommonConfigurationFields extends TestConfigurationFieldsBase {
     xmlPropsToSkipCompare.add("fs.viewfs.overload.scheme.target.s3a.impl");
     xmlPropsToSkipCompare.
         add("fs.viewfs.overload.scheme.target.swebhdfs.impl");
+    xmlPropsToSkipCompare.add("fs.viewfs.overload.scheme.target.swift.impl");
     xmlPropsToSkipCompare.add("fs.viewfs.overload.scheme.target.webhdfs.impl");
     xmlPropsToSkipCompare.add("fs.viewfs.overload.scheme.target.wasb.impl");
-    xmlPropsToSkipCompare.add("fs.viewfs.overload.scheme.target.swift.impl");
 
     // Azure properties are in a different class
     // - org.apache.hadoop.fs.azure.AzureNativeFileSystemStore