| /** |
| * 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. |
| */ |
| |
| package org.apache.hcatalog.data; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hive.metastore.api.MetaException; |
| import org.apache.hadoop.hive.ql.CommandNeedRetryException; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hcatalog.common.HCatException; |
| import org.apache.hcatalog.data.transfer.DataTransferFactory; |
| import org.apache.hcatalog.data.transfer.HCatReader; |
| import org.apache.hcatalog.data.transfer.HCatWriter; |
| import org.apache.hcatalog.data.transfer.ReadEntity; |
| import org.apache.hcatalog.data.transfer.ReaderContext; |
| import org.apache.hcatalog.data.transfer.WriteEntity; |
| import org.apache.hcatalog.data.transfer.WriterContext; |
| import org.apache.hcatalog.mapreduce.HCatBaseTest; |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| public class TestReaderWriter extends HCatBaseTest { |
| |
| @Test |
| public void test() throws MetaException, CommandNeedRetryException, |
| IOException, ClassNotFoundException { |
| |
| driver.run("drop table mytbl"); |
| driver.run("create table mytbl (a string, b int)"); |
| Iterator<Entry<String, String>> itr = hiveConf.iterator(); |
| Map<String, String> map = new HashMap<String, String>(); |
| while (itr.hasNext()) { |
| Entry<String, String> kv = itr.next(); |
| map.put(kv.getKey(), kv.getValue()); |
| } |
| |
| WriterContext cntxt = runsInMaster(map); |
| |
| File writeCntxtFile = File.createTempFile("hcat-write", "temp"); |
| writeCntxtFile.deleteOnExit(); |
| |
| // Serialize context. |
| ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(writeCntxtFile)); |
| oos.writeObject(cntxt); |
| oos.flush(); |
| oos.close(); |
| |
| // Now, deserialize it. |
| ObjectInputStream ois = new ObjectInputStream(new FileInputStream(writeCntxtFile)); |
| cntxt = (WriterContext) ois.readObject(); |
| ois.close(); |
| |
| runsInSlave(cntxt); |
| commit(map, true, cntxt); |
| |
| ReaderContext readCntxt = runsInMaster(map, false); |
| |
| File readCntxtFile = File.createTempFile("hcat-read", "temp"); |
| readCntxtFile.deleteOnExit(); |
| oos = new ObjectOutputStream(new FileOutputStream(readCntxtFile)); |
| oos.writeObject(readCntxt); |
| oos.flush(); |
| oos.close(); |
| |
| ois = new ObjectInputStream(new FileInputStream(readCntxtFile)); |
| readCntxt = (ReaderContext) ois.readObject(); |
| ois.close(); |
| |
| for (InputSplit split : readCntxt.getSplits()) { |
| runsInSlave(split, readCntxt.getConf()); |
| } |
| } |
| |
| private WriterContext runsInMaster(Map<String, String> config) throws HCatException { |
| |
| WriteEntity.Builder builder = new WriteEntity.Builder(); |
| WriteEntity entity = builder.withTable("mytbl").build(); |
| HCatWriter writer = DataTransferFactory.getHCatWriter(entity, config); |
| WriterContext info = writer.prepareWrite(); |
| return info; |
| } |
| |
| private ReaderContext runsInMaster(Map<String, String> config, boolean bogus) |
| throws HCatException { |
| ReadEntity entity = new ReadEntity.Builder().withTable("mytbl").build(); |
| HCatReader reader = DataTransferFactory.getHCatReader(entity, config); |
| ReaderContext cntxt = reader.prepareRead(); |
| return cntxt; |
| } |
| |
| private void runsInSlave(InputSplit split, Configuration config) throws HCatException { |
| |
| HCatReader reader = DataTransferFactory.getHCatReader(split, config); |
| Iterator<HCatRecord> itr = reader.read(); |
| int i = 1; |
| while (itr.hasNext()) { |
| HCatRecord read = itr.next(); |
| HCatRecord written = getRecord(i++); |
| // Argh, HCatRecord doesnt implement equals() |
| Assert.assertTrue("Read: " + read.get(0) + "Written: " + written.get(0), |
| written.get(0).equals(read.get(0))); |
| Assert.assertTrue("Read: " + read.get(1) + "Written: " + written.get(1), |
| written.get(1).equals(read.get(1))); |
| Assert.assertEquals(2, read.size()); |
| } |
| //Assert.assertFalse(itr.hasNext()); |
| } |
| |
| private void runsInSlave(WriterContext context) throws HCatException { |
| |
| HCatWriter writer = DataTransferFactory.getHCatWriter(context); |
| writer.write(new HCatRecordItr()); |
| } |
| |
| private void commit(Map<String, String> config, boolean status, |
| WriterContext context) throws IOException { |
| |
| WriteEntity.Builder builder = new WriteEntity.Builder(); |
| WriteEntity entity = builder.withTable("mytbl").build(); |
| HCatWriter writer = DataTransferFactory.getHCatWriter(entity, config); |
| if (status) { |
| writer.commit(context); |
| } else { |
| writer.abort(context); |
| } |
| } |
| |
| private static HCatRecord getRecord(int i) { |
| List<Object> list = new ArrayList<Object>(2); |
| list.add("Row #: " + i); |
| list.add(i); |
| return new DefaultHCatRecord(list); |
| } |
| |
| private static class HCatRecordItr implements Iterator<HCatRecord> { |
| |
| int i = 0; |
| |
| @Override |
| public boolean hasNext() { |
| return i++ < 100 ? true : false; |
| } |
| |
| @Override |
| public HCatRecord next() { |
| return getRecord(i); |
| } |
| |
| @Override |
| public void remove() { |
| throw new RuntimeException(); |
| } |
| } |
| } |