Add initial HDFS tests (#1225)

* Add initial HDFS tests

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Install Java and libhdfs.so for tests

* Fix kokorun

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

.github/workflows/build.wheel.sh

@@ -29,5 +29,20 @@ if [[ $(uname) == "Linux" ]]; then
   apt-get -y -qq install $PYTHON_VERSION ffmpeg  dnsutils libmp3lame0
   curl -sSOL https://bootstrap.pypa.io/get-pip.py
   $PYTHON_VERSION get-pip.py -q
+
+  # Install Java
+  apt-get -y -qq install openjdk-8-jdk
+  update-alternatives --config java
+  export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
+
+  # Install Hadoop
+  curl -OL https://archive.apache.org/dist/hadoop/common/hadoop-2.7.0/hadoop-2.7.0.tar.gz
+  tar -xzf hadoop-2.7.0.tar.gz -C /usr/local
+  export HADOOP_HOME=/usr/local/hadoop-2.7.0
+
+  # Update environmental variable
+  export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:${JAVA_HOME}/jre/lib/amd64/server:${HADOOP_HOME}/lib/native
+  export CLASSPATH=$(${HADOOP_HOME}/bin/hadoop classpath --glob)
+  export
 fi
 run_test $PYTHON_VERSION

.github/workflows/build.yml

@@ -298,6 +298,7 @@ jobs:
           bash -x -e tests/test_sql/sql_test.sh
           bash -x -e tests/test_gcloud/test_gcs.sh gcs-emulator
           bash -x -e tests/test_pulsar/pulsar_test.sh
+          bash -x -e tests/test_hdfs/hdfs_test.sh
       - name: Test Linux
         run: |
           set -x -e

.kokorun/io_cpu.sh

@@ -81,6 +81,7 @@ bash -x -e tests/test_azure/start_azure.sh
 bash -x -e tests/test_sql/sql_test.sh sql
 bash -x -e tests/test_elasticsearch/elasticsearch_test.sh start
 bash -x -e tests/test_mongodb/mongodb_test.sh start
+bash -x -e tests/test_hdfs/hdfs_test.sh
 
 docker run -i --rm -v $PWD:/v -w /v --net=host \
   buildpack-deps:20.04 bash -x -e .github/workflows/build.wheel.sh python${PYTHON_VERSION}

tests/test_hdfs/hdfs_test.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# Copyright 2020 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed 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 -e
+set -o pipefail
+
+HADOOP_VERSION=2.7.0
+docker pull sequenceiq/hadoop-docker:$HADOOP_VERSION
+docker run -d --rm --net=host --name=tensorflow-io-hdfs sequenceiq/hadoop-docker:$HADOOP_VERSION
+echo "Waiting for 30 secs until hadoop is up and running"
+sleep 30
+docker logs tensorflow-io-hdfs
+echo "Hadoop up"
+exit 0

tests/test_hdfs_eager.py

@@ -0,0 +1,42 @@
+# Copyright 2020 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed 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.
+# ==============================================================================
+"""Tests for HDFS file system"""
+
+import os
+import sys
+import socket
+import time
+import tempfile
+import tensorflow as tf
+import tensorflow_io as tfio
+import pytest
+
+
+@pytest.mark.skipif(
+    sys.platform in ("win32", "darwin"),
+    reason="TODO HDFS not setup properly on macOS/Windows yet",
+)
+def test_read_file():
+    """Test case for reading HDFS"""
+
+    address = socket.gethostbyname(socket.gethostname())
+    print("ADDRESS: {}".format(address))
+
+    body = b"1234567"
+    tf.io.write_file("hdfse://{}:9000/file.txt".format(address), body)
+
+    content = tf.io.read_file("hdfse://{}:9000/file.txt".format(address))
+    print("CONTENT: {}".format(content))
+    assert content == body