Add GCS to supported filesystems

docs/configurations.md

@@ -81,4 +81,7 @@ summary: "Here we list all possible configurations and what they mean"
     - [S3Configs](s3_hoodie.html) (Hoodie S3 Configs) <br/>
     <span style="color:grey">Configurations required for S3 and Hoodie co-operability.</span>
 
+    - [GCSConfigs](gcs_hoodie.html) (Hoodie GCS Configs) <br/>
+    <span style="color:grey">Configurations required for GCS and Hoodie co-operability.</span>
+
 {% include callout.html content="Hoodie is a young project. A lot of pluggable interfaces and configurations to support diverse workloads need to be created. Get involved [here](https://github.com/uber/hoodie)" type="info" %}

docs/gcs_filesystem.md

@@ -0,0 +1,62 @@
+---
+title: GCS Filesystem (experimental)
+keywords: sql hive gcs spark presto
+sidebar: mydoc_sidebar
+permalink: gcs_hoodie.html
+toc: false
+summary: In this page, we go over how to configure hoodie with Google Cloud Storage.
+---
+Hoodie works with HDFS by default and GCS **regional** buckets provide an HDFS API with strong consistency.
+
+## GCS Configs
+
+There are two configurations required for Hoodie GCS compatibility:
+
+- Adding GCS Credentials for Hoodie
+- Adding required jars to classpath
+
+### GCS Credentials
+
+Add the required configs in your core-site.xml from where Hoodie can fetch them. Replace the `fs.defaultFS` with your GCS bucket name and Hoodie should be able to read/write from the bucket.
+
+```xml
+  <property>
+    <name>fs.defaultFS</name>
+    <value>gs://hoodie-bucket</value>
+  </property>
+
+  <property>
+    <name>fs.gs.impl</name>
+    <value>com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystem</value>
+    <description>The FileSystem for gs: (GCS) uris.</description>
+  </property>
+
+  <property>
+    <name>fs.AbstractFileSystem.gs.impl</name>
+    <value>com.google.cloud.hadoop.fs.gcs.GoogleHadoopFS</value>
+    <description>The AbstractFileSystem for gs: (GCS) uris.</description>
+  </property>
+
+  <property>
+    <name>fs.gs.project.id</name>
+    <value>GCS_PROJECT_ID</value>
+  </property>
+  <property>
+    <name>google.cloud.auth.service.account.enable</name>
+    <value>true</value>
+  </property>
+  <property>
+    <name>google.cloud.auth.service.account.email</name>
+    <value>GCS_SERVICE_ACCOUNT_EMAIL</value>
+  </property>
+  <property>
+    <name>google.cloud.auth.service.account.keyfile</name>
+    <value>GCS_SERVICE_ACCOUNT_KEYFILE</value>
+  </property>
+```
+
+### GCS Libs
+
+GCS hadoop libraries to add to our classpath
+
+- com.google.cloud.bigdataoss:gcs-connector:1.6.0-hadoop2

hoodie-client/src/main/java/com/uber/hoodie/io/storage/HoodieWrapperFileSystem.java

@@ -53,6 +53,10 @@ public class HoodieWrapperFileSystem extends FileSystem {
         SUPPORT_SCHEMES.add("file");
         SUPPORT_SCHEMES.add("hdfs");
         SUPPORT_SCHEMES.add("s3");
+
+        // Hoodie currently relies on underlying object store being fully
+        // consistent so only regional buckets should be used.
+        SUPPORT_SCHEMES.add("gs");
     }
 
     private ConcurrentMap<String, SizeAwareFSDataOutputStream> openStreams =