Github user selvaganesang commented on a diff in the pull request:
https://github.com/apache/trafodion/pull/1417#discussion_r165170894
--- Diff: core/sql/src/main/java/org/trafodion/sql/HDFSClient.java ---
@@ -0,0 +1,319 @@
+// @@@ START COPYRIGHT @@@
+//
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you 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.
+//
+// @@@ END COPYRIGHT @@@
+
+package org.trafodion.sql;
+
+import org.apache.log4j.PropertyConfigurator;
+import org.apache.log4j.Logger;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.FileUtil;
+import org.apache.hadoop.fs.FSDataInputStream;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.conf.Configuration;
+import java.nio.ByteBuffer;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.concurrent.Callable;
+import java.util.concurrent.Future;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.hadoop.io.compress.CodecPool;
+import org.apache.hadoop.io.compress.CompressionCodec;
+import org.apache.hadoop.io.compress.Compressor;
+import org.apache.hadoop.io.compress.GzipCodec;
+import org.apache.hadoop.io.SequenceFile.CompressionType;
+import org.apache.hadoop.util.ReflectionUtils;
+
+public class HDFSClient
+{
+ static Logger logger_ = Logger.getLogger(HDFSClient.class.getName());
+ private static Configuration config_ = null;
+ private static ExecutorService executorService_ = null;
+ private static FileSystem defaultFs_ = null;
+ private FileSystem fs_ = null;
+ private int bufNo_;
+ private FSDataInputStream fsdis_;
+ private OutputStream outStream_;
+ private String filename_;
+ private ByteBuffer buf_;
+ private int bufLen_;
+ private int bufOffset_ = 0;
+ private long pos_ = 0;
+ private int len_ = 0;
+ private int lenRemain_ = 0;
+ private int blockSize_;
+ private int bytesRead_;
+ private Future future_ = null;
+
+ static {
+ String confFile = System.getProperty("trafodion.log4j.configFile");
+ System.setProperty("trafodion.root", System.getenv("TRAF_HOME"));
+ if (confFile == null) {
+ confFile = System.getenv("TRAF_CONF") + "/log4j.sql.config";
+ }
+ PropertyConfigurator.configure(confFile);
+ config_ = TrafConfiguration.create(TrafConfiguration.HDFS_CONF);
+ executorService_ = Executors.newCachedThreadPool();
+ try {
+ defaultFs_ = FileSystem.get(config_);
+ }
+ catch (IOException ioe) {
+ throw new RuntimeException("Exception in HDFSClient static
block", ioe);
+ }
+ }
+
+ class HDFSRead implements Callable
--- End diff --
HdfsClient is meant for both read and write to hdfs text files. Need to
check if we can use for other format files too. HdfsClient is also used to
create Hdfs files..
I have made 2nd commit that might help to understand it better with some
comments in ExHdfsScan.h
---
