diff --git a/assembly/pom.xml b/assembly/pom.xml
index a207dae5a74ff..9608c96fd5369 100644
--- a/assembly/pom.xml
+++ b/assembly/pom.xml
@@ -254,6 +254,14 @@
           <artifactId>spark-hadoop-cloud_${scala.binary.version}</artifactId>
           <version>${project.version}</version>
         </dependency>
+        <!--
+        Redeclare this dependency to force it into the distribution.
+        -->
+        <dependency>
+          <groupId>org.eclipse.jetty</groupId>
+          <artifactId>jetty-util</artifactId>
+          <scope>${hadoop.deps.scope}</scope>
+        </dependency>
       </dependencies>
     </profile>
   </profiles>
diff --git a/core/pom.xml b/core/pom.xml
index 9258a856028a0..093a9869b6dd7 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -95,6 +95,12 @@
       <groupId>org.apache.curator</groupId>
       <artifactId>curator-recipes</artifactId>
     </dependency>
+    <!-- With curator 2.12  SBT/Ivy doesn't get ZK on the build classpath.
+         Explicitly declaring it as a dependency fixes this. -->
+    <dependency>
+      <groupId>org.apache.zookeeper</groupId>
+      <artifactId>zookeeper</artifactId>
+    </dependency>
 
     <!-- Jetty dependencies promoted to compile here so they are shaded
          and inlined into spark-core jar -->
diff --git a/dev/deps/spark-deps-hadoop-3.1 b/dev/deps/spark-deps-hadoop-3.1
new file mode 100644
index 0000000000000..97ad65a4096cb
--- /dev/null
+++ b/dev/deps/spark-deps-hadoop-3.1
@@ -0,0 +1,221 @@
+HikariCP-java7-2.4.12.jar
+JavaEWAH-0.3.2.jar
+RoaringBitmap-0.5.11.jar
+ST4-4.0.4.jar
+accessors-smart-1.2.jar
+activation-1.1.1.jar
+aircompressor-0.8.jar
+antlr-2.7.7.jar
+antlr-runtime-3.4.jar
+antlr4-runtime-4.7.jar
+aopalliance-1.0.jar
+aopalliance-repackaged-2.4.0-b34.jar
+apache-log4j-extras-1.2.17.jar
+arpack_combined_all-0.1.jar
+arrow-format-0.8.0.jar
+arrow-memory-0.8.0.jar
+arrow-vector-0.8.0.jar
+automaton-1.11-8.jar
+avro-1.7.7.jar
+avro-ipc-1.7.7.jar
+avro-mapred-1.7.7-hadoop2.jar
+base64-2.3.8.jar
+bcprov-jdk15on-1.58.jar
+bonecp-0.8.0.RELEASE.jar
+breeze-macros_2.11-0.13.2.jar
+breeze_2.11-0.13.2.jar
+calcite-avatica-1.2.0-incubating.jar
+calcite-core-1.2.0-incubating.jar
+calcite-linq4j-1.2.0-incubating.jar
+chill-java-0.8.4.jar
+chill_2.11-0.8.4.jar
+commons-beanutils-1.9.3.jar
+commons-cli-1.2.jar
+commons-codec-1.10.jar
+commons-collections-3.2.2.jar
+commons-compiler-3.0.8.jar
+commons-compress-1.4.1.jar
+commons-configuration2-2.1.1.jar
+commons-crypto-1.0.0.jar
+commons-daemon-1.0.13.jar
+commons-dbcp-1.4.jar
+commons-httpclient-3.1.jar
+commons-io-2.4.jar
+commons-lang-2.6.jar
+commons-lang3-3.5.jar
+commons-logging-1.1.3.jar
+commons-math3-3.4.1.jar
+commons-net-3.1.jar
+commons-pool-1.5.4.jar
+compress-lzf-1.0.3.jar
+core-1.1.2.jar
+curator-client-2.12.0.jar
+curator-framework-2.12.0.jar
+curator-recipes-2.12.0.jar
+datanucleus-api-jdo-3.2.6.jar
+datanucleus-core-3.2.10.jar
+datanucleus-rdbms-3.2.9.jar
+derby-10.12.1.1.jar
+dnsjava-2.1.7.jar
+ehcache-3.3.1.jar
+eigenbase-properties-1.1.5.jar
+flatbuffers-1.2.0-3f79e055.jar
+generex-1.0.1.jar
+geronimo-jcache_1.0_spec-1.0-alpha-1.jar
+gson-2.2.4.jar
+guava-14.0.1.jar
+guice-4.0.jar
+guice-servlet-4.0.jar
+hadoop-annotations-3.1.0.jar
+hadoop-auth-3.1.0.jar
+hadoop-client-3.1.0.jar
+hadoop-common-3.1.0.jar
+hadoop-hdfs-client-3.1.0.jar
+hadoop-mapreduce-client-common-3.1.0.jar
+hadoop-mapreduce-client-core-3.1.0.jar
+hadoop-mapreduce-client-jobclient-3.1.0.jar
+hadoop-yarn-api-3.1.0.jar
+hadoop-yarn-client-3.1.0.jar
+hadoop-yarn-common-3.1.0.jar
+hadoop-yarn-registry-3.1.0.jar
+hadoop-yarn-server-common-3.1.0.jar
+hadoop-yarn-server-web-proxy-3.1.0.jar
+hk2-api-2.4.0-b34.jar
+hk2-locator-2.4.0-b34.jar
+hk2-utils-2.4.0-b34.jar
+hppc-0.7.2.jar
+htrace-core4-4.1.0-incubating.jar
+httpclient-4.5.4.jar
+httpcore-4.4.8.jar
+ivy-2.4.0.jar
+jackson-annotations-2.6.7.jar
+jackson-core-2.6.7.jar
+jackson-core-asl-1.9.13.jar
+jackson-databind-2.6.7.1.jar
+jackson-dataformat-yaml-2.6.7.jar
+jackson-jaxrs-base-2.7.8.jar
+jackson-jaxrs-json-provider-2.7.8.jar
+jackson-mapper-asl-1.9.13.jar
+jackson-module-jaxb-annotations-2.6.7.jar
+jackson-module-paranamer-2.7.9.jar
+jackson-module-scala_2.11-2.6.7.1.jar
+janino-3.0.8.jar
+java-xmlbuilder-1.1.jar
+javassist-3.18.1-GA.jar
+javax.annotation-api-1.2.jar
+javax.inject-1.jar
+javax.inject-2.4.0-b34.jar
+javax.servlet-api-3.1.0.jar
+javax.ws.rs-api-2.0.1.jar
+javolution-5.5.1.jar
+jaxb-api-2.2.11.jar
+jcip-annotations-1.0-1.jar
+jcl-over-slf4j-1.7.16.jar
+jdo-api-3.0.1.jar
+jersey-client-2.22.2.jar
+jersey-common-2.22.2.jar
+jersey-container-servlet-2.22.2.jar
+jersey-container-servlet-core-2.22.2.jar
+jersey-guava-2.22.2.jar
+jersey-media-jaxb-2.22.2.jar
+jersey-server-2.22.2.jar
+jets3t-0.9.4.jar
+jetty-webapp-9.3.20.v20170531.jar
+jetty-xml-9.3.20.v20170531.jar
+jline-2.12.1.jar
+joda-time-2.9.3.jar
+jodd-core-3.5.2.jar
+jpam-1.1.jar
+json-smart-2.3.jar
+json4s-ast_2.11-3.5.3.jar
+json4s-core_2.11-3.5.3.jar
+json4s-jackson_2.11-3.5.3.jar
+json4s-scalap_2.11-3.5.3.jar
+jsp-api-2.1.jar
+jsr305-1.3.9.jar
+jta-1.1.jar
+jtransforms-2.4.0.jar
+jul-to-slf4j-1.7.16.jar
+kerb-admin-1.0.1.jar
+kerb-client-1.0.1.jar
+kerb-common-1.0.1.jar
+kerb-core-1.0.1.jar
+kerb-crypto-1.0.1.jar
+kerb-identity-1.0.1.jar
+kerb-server-1.0.1.jar
+kerb-simplekdc-1.0.1.jar
+kerb-util-1.0.1.jar
+kerby-asn1-1.0.1.jar
+kerby-config-1.0.1.jar
+kerby-pkix-1.0.1.jar
+kerby-util-1.0.1.jar
+kerby-xdr-1.0.1.jar
+kryo-shaded-3.0.3.jar
+kubernetes-client-3.0.0.jar
+kubernetes-model-2.0.0.jar
+leveldbjni-all-1.8.jar
+libfb303-0.9.3.jar
+libthrift-0.9.3.jar
+log4j-1.2.17.jar
+logging-interceptor-3.8.1.jar
+lz4-java-1.4.0.jar
+machinist_2.11-0.6.1.jar
+macro-compat_2.11-1.1.1.jar
+mesos-1.4.0-shaded-protobuf.jar
+metrics-core-3.1.5.jar
+metrics-graphite-3.1.5.jar
+metrics-json-3.1.5.jar
+metrics-jvm-3.1.5.jar
+minlog-1.3.0.jar
+mssql-jdbc-6.2.1.jre7.jar
+netty-3.9.9.Final.jar
+netty-all-4.1.17.Final.jar
+nimbus-jose-jwt-4.41.1.jar
+objenesis-2.1.jar
+okhttp-2.7.5.jar
+okhttp-3.8.1.jar
+okio-1.13.0.jar
+opencsv-2.3.jar
+orc-core-1.4.3-nohive.jar
+orc-mapreduce-1.4.3-nohive.jar
+oro-2.0.8.jar
+osgi-resource-locator-1.0.1.jar
+paranamer-2.8.jar
+parquet-column-1.8.2.jar
+parquet-common-1.8.2.jar
+parquet-encoding-1.8.2.jar
+parquet-format-2.3.1.jar
+parquet-hadoop-1.8.2.jar
+parquet-hadoop-bundle-1.6.0.jar
+parquet-jackson-1.8.2.jar
+protobuf-java-2.5.0.jar
+py4j-0.10.6.jar
+pyrolite-4.13.jar
+re2j-1.1.jar
+scala-compiler-2.11.8.jar
+scala-library-2.11.8.jar
+scala-parser-combinators_2.11-1.0.4.jar
+scala-reflect-2.11.8.jar
+scala-xml_2.11-1.0.5.jar
+shapeless_2.11-2.3.2.jar
+slf4j-api-1.7.16.jar
+slf4j-log4j12-1.7.16.jar
+snakeyaml-1.15.jar
+snappy-0.2.jar
+snappy-java-1.1.7.1.jar
+spire-macros_2.11-0.13.0.jar
+spire_2.11-0.13.0.jar
+stax-api-1.0.1.jar
+stax2-api-3.1.4.jar
+stream-2.7.0.jar
+stringtemplate-3.2.1.jar
+super-csv-2.2.0.jar
+token-provider-1.0.1.jar
+univocity-parsers-2.5.9.jar
+validation-api-1.1.0.Final.jar
+woodstox-core-5.0.3.jar
+xbean-asm5-shaded-4.4.jar
+xz-1.0.jar
+zjsonpatch-0.3.0.jar
+zookeeper-3.4.9.jar
+zstd-jni-1.3.2-2.jar
diff --git a/dev/test-dependencies.sh b/dev/test-dependencies.sh
index 3bf7618e1ea96..2fbd6b5e98f7f 100755
--- a/dev/test-dependencies.sh
+++ b/dev/test-dependencies.sh
@@ -34,6 +34,7 @@ MVN="build/mvn"
 HADOOP_PROFILES=(
     hadoop-2.6
     hadoop-2.7
+    hadoop-3.1
 )
 
 # We'll switch the version to a temp. one, publish POMs using that new version, then switch back to
diff --git a/hadoop-cloud/pom.xml b/hadoop-cloud/pom.xml
index 8e424b1c50236..2c39a7df0146e 100644
--- a/hadoop-cloud/pom.xml
+++ b/hadoop-cloud/pom.xml
@@ -38,7 +38,32 @@
     <sbt.project.name>hadoop-cloud</sbt.project.name>
   </properties>
 
+  <build>
+    <outputDirectory>target/scala-${scala.binary.version}/classes</outputDirectory>
+    <testOutputDirectory>target/scala-${scala.binary.version}/test-classes</testOutputDirectory>
+  </build>
+
   <dependencies>
+    <!--used during compilation but not exported as transitive dependencies-->
+    <dependency>
+      <groupId>org.apache.spark</groupId>
+      <artifactId>spark-sql_${scala.binary.version}</artifactId>
+      <version>${project.version}</version>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.spark</groupId>
+      <artifactId>spark-core_${scala.binary.version}</artifactId>
+      <version>${project.version}</version>
+      <type>test-jar</type>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-client</artifactId>
+      <version>${hadoop.version}</version>
+      <scope>provided</scope>
+    </dependency>
     <!--
       the AWS module pulls in jackson; its transitive dependencies can create
       intra-jackson-module version problems.
@@ -147,7 +172,7 @@
 
     <profile>
       <id>hadoop-2.7</id>
-      <!-- Hadoop Azure is a new Jar with -->
+      <!-- 2.7+ adds the azure Jar to the set of dependencies -->
       <dependencies>
 
         <!--
@@ -180,6 +205,62 @@
       </dependencies>
     </profile>
 
+    <!--
+     Hadoop 3 simplifies the classpath, and adds a new committer base class which
+     enables store-specific committers.
+    -->
+    <profile>
+      <id>hadoop-3.1</id>
+      <dependencies>
+        <!--
+        There's now a hadoop-cloud-storage which transitively pulls in the store JARs,
+        but it still needs some selective exclusion across versions, especially 3.0.x.
+        -->
+        <dependency>
+          <groupId>org.apache.hadoop</groupId>
+          <artifactId>hadoop-cloud-storage</artifactId>
+          <version>${hadoop.version}</version>
+          <scope>${hadoop.deps.scope}</scope>
+          <exclusions>
+            <exclusion>
+              <groupId>org.apache.hadoop</groupId>
+              <artifactId>hadoop-common</artifactId>
+            </exclusion>
+            <exclusion>
+              <groupId>org.codehaus.jackson</groupId>
+              <artifactId>jackson-mapper-asl</artifactId>
+            </exclusion>
+            <exclusion>
+              <groupId>com.fasterxml.jackson.core</groupId>
+              <artifactId>jackson-core</artifactId>
+            </exclusion>
+            <exclusion>
+              <groupId>com.google.guava</groupId>
+              <artifactId>guava</artifactId>
+            </exclusion>
+          </exclusions>
+        </dependency>
+        <!--
+        The jetty declarations are made
+        (a) to keep that jetty-util-ajax version in sync with the rest of Spark.
+        (b) to minimise the effects which Spark's jetty shading has on the
+            availability of the jetty JARs on for hadoop-azure, which depends
+            on them.
+         -->
+        <dependency>
+          <groupId>org.eclipse.jetty</groupId>
+          <artifactId>jetty-util</artifactId>
+          <scope>${hadoop.deps.scope}</scope>
+        </dependency>
+        <dependency>
+          <groupId>org.eclipse.jetty</groupId>
+          <artifactId>jetty-util-ajax</artifactId>
+          <version>${jetty.version}</version>
+          <scope>${hadoop.deps.scope}</scope>
+        </dependency>
+      </dependencies>
+    </profile>
+
   </profiles>
 
 </project>
diff --git a/pom.xml b/pom.xml
index 0a711f287a53f..88e77ff874748 100644
--- a/pom.xml
+++ b/pom.xml
@@ -2671,6 +2671,15 @@
       </properties>
     </profile>
 
+    <profile>
+      <id>hadoop-3.1</id>
+      <properties>
+        <hadoop.version>3.1.0</hadoop.version>
+        <curator.version>2.12.0</curator.version>
+        <zookeeper.version>3.4.9</zookeeper.version>
+      </properties>
+    </profile>
+
     <profile>
       <id>yarn</id>
       <modules>