/**
* Copyright 2009 The Apache Software Foundation
*
* 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.hadoop.hbase.io.hfile;
import java.io.IOException;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseTestCase;
import org.apache.hadoop.hbase.util.Bytes;
/**
* Test {@link HFileScanner#seekTo(byte[])} and its variants.
*/
public class TestSeekTo extends HBaseTestCase {
Path makeNewFile() throws IOException {
Path ncTFile = new Path(this.testDir, "basic.hfile");
FSDataOutputStream fout = this.fs.create(ncTFile);
HFile.Writer writer = new HFile.Writer(fout, 40, "none", null);
// 4 bytes * 3 * 2 for each key/value +
// 3 for keys, 15 for values = 42 (woot)
writer.append(Bytes.toBytes("c"), Bytes.toBytes("value"));
writer.append(Bytes.toBytes("e"), Bytes.toBytes("value"));
writer.append(Bytes.toBytes("g"), Bytes.toBytes("value"));
// block transition
writer.append(Bytes.toBytes("i"), Bytes.toBytes("value"));
writer.append(Bytes.toBytes("k"), Bytes.toBytes("value"));
writer.close();
fout.close();
return ncTFile;
}
public void testSeekBefore() throws Exception {
Path p = makeNewFile();
HFile.Reader reader = new HFile.Reader(fs, p, null, false);
reader.loadFileInfo();
HFileScanner scanner = reader.getScanner(false, true);
assertEquals(false, scanner.seekBefore(Bytes.toBytes("a")));
assertEquals(false, scanner.seekBefore(Bytes.toBytes("c")));
assertEquals(true, scanner.seekBefore(Bytes.toBytes("d")));
assertEquals("c", scanner.getKeyString());
assertEquals(true, scanner.seekBefore(Bytes.toBytes("e")));
assertEquals("c", scanner.getKeyString());
assertEquals(true, scanner.seekBefore(Bytes.toBytes("f")));
assertEquals("e", scanner.getKeyString());
assertEquals(true, scanner.seekBefore(Bytes.toBytes("g")));
assertEquals("e", scanner.getKeyString());
assertEquals(true, scanner.seekBefore(Bytes.toBytes("h")));
assertEquals("g", scanner.getKeyString());
assertEquals(true, scanner.seekBefore(Bytes.toBytes("i")));
assertEquals("g", scanner.getKeyString());
assertEquals(true, scanner.seekBefore(Bytes.toBytes("j")));
assertEquals("i", scanner.getKeyString());
assertEquals(true, scanner.seekBefore(Bytes.toBytes("k")));
assertEquals("i", scanner.getKeyString());
assertEquals(true, scanner.seekBefore(Bytes.toBytes("l")));
assertEquals("k", scanner.getKeyString());
}
public void testSeekTo() throws Exception {
Path p = makeNewFile();
HFile.Reader reader = new HFile.Reader(fs, p, null, false);
reader.loadFileInfo();
assertEquals(2, reader.blockIndex.count);
HFileScanner scanner = reader.getScanner(false, true);
// lies before the start of the file.
assertEquals(-1, scanner.seekTo(Bytes.toBytes("a")));
assertEquals(1, scanner.seekTo(Bytes.toBytes("d")));
assertEquals("c", scanner.getKeyString());
// Across a block boundary now.
assertEquals(1, scanner.seekTo(Bytes.toBytes("h")));
assertEquals("g", scanner.getKeyString());
assertEquals(1, scanner.seekTo(Bytes.toBytes("l")));
assertEquals("k", scanner.getKeyString());
}
public void testBlockContainingKey() throws Exception {
Path p = makeNewFile();
HFile.Reader reader = new HFile.Reader(fs, p, null, false);
reader.loadFileInfo();
System.out.println(reader.blockIndex.toString());
// falls before the start of the file.
assertEquals(-1, reader.blockIndex.blockContainingKey(Bytes.toBytes("a"), 0, 1));
assertEquals(0, reader.blockIndex.blockContainingKey(Bytes.toBytes("c"), 0, 1));
assertEquals(0, reader.blockIndex.blockContainingKey(Bytes.toBytes("d"), 0, 1));
assertEquals(0, reader.blockIndex.blockContainingKey(Bytes.toBytes("e"), 0, 1));
assertEquals(0, reader.blockIndex.blockContainingKey(Bytes.toBytes("g"), 0, 1));
assertEquals(0, reader.blockIndex.blockContainingKey(Bytes.toBytes("h"), 0, 1));
assertEquals(1, reader.blockIndex.blockContainingKey(Bytes.toBytes("i"), 0, 1));
assertEquals(1, reader.blockIndex.blockContainingKey(Bytes.toBytes("j"), 0, 1));
assertEquals(1, reader.blockIndex.blockContainingKey(Bytes.toBytes("k"), 0, 1));
assertEquals(1, reader.blockIndex.blockContainingKey(Bytes.toBytes("l"), 0, 1));
}
}