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apache / hbase / 1726160839368df14602da1618e3538955b25f74 / . / hbase-common / src / main / java / org / apache / hadoop / hbase / KeyValue.java
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/**
* Copyright 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;
import static org.apache.hadoop.hbase.util.Bytes.len;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.hbase.util.ByteBufferUtils;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.ClassSize;
import org.apache.hadoop.io.RawComparator;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An HBase Key/Value. This is the fundamental HBase Type.
* <p>
* HBase applications and users should use the Cell interface and avoid directly using KeyValue and
* member functions not defined in Cell.
* <p>
* If being used client-side, the primary methods to access individual fields are
* {@link #getRowArray()}, {@link #getFamilyArray()}, {@link #getQualifierArray()},
* {@link #getTimestamp()}, and {@link #getValueArray()}. These methods allocate new byte arrays
* and return copies. Avoid their use server-side.
* <p>
* Instances of this class are immutable. They do not implement Comparable but Comparators are
* provided. Comparators change with context, whether user table or a catalog table comparison. Its
* critical you use the appropriate comparator. There are Comparators for normal HFiles, Meta's
* Hfiles, and bloom filter keys.
* <p>
* KeyValue wraps a byte array and takes offsets and lengths into passed array at where to start
* interpreting the content as KeyValue. The KeyValue format inside a byte array is:
* <code>&lt;keylength&gt; &lt;valuelength&gt; &lt;key&gt; &lt;value&gt;</code> Key is further
* decomposed as: <code>&lt;rowlength&gt; &lt;row&gt; &lt;columnfamilylength&gt;
* &lt;columnfamily&gt; &lt;columnqualifier&gt;
* &lt;timestamp&gt; &lt;keytype&gt;</code> The <code>rowlength</code> maximum is
* <code>Short.MAX_SIZE</code>, column family length maximum is <code>Byte.MAX_SIZE</code>, and
* column qualifier + key length must be &lt; <code>Integer.MAX_SIZE</code>. The column does not
* contain the family/qualifier delimiter, {@link #COLUMN_FAMILY_DELIMITER}<br>
* KeyValue can optionally contain Tags. When it contains tags, it is added in the byte array after
* the value part. The format for this part is: <code>&lt;tagslength&gt;&lt;tagsbytes&gt;</code>.
* <code>tagslength</code> maximum is <code>Short.MAX_SIZE</code>. The <code>tagsbytes</code>
* contain one or more tags where as each tag is of the form
* <code>&lt;taglength&gt;&lt;tagtype&gt;&lt;tagbytes&gt;</code>. <code>tagtype</code> is one byte
* and <code>taglength</code> maximum is <code>Short.MAX_SIZE</code> and it includes 1 byte type
* length and actual tag bytes length.
*/
@InterfaceAudience.Private
public class KeyValue implements ExtendedCell, Cloneable {
private static final ArrayList<Tag> EMPTY_ARRAY_LIST = new ArrayList<>();
private static final Logger LOG = LoggerFactory.getLogger(KeyValue.class);
public static final int FIXED_OVERHEAD = ClassSize.OBJECT + // the KeyValue object itself
ClassSize.REFERENCE + // pointer to "bytes"
2 * Bytes.SIZEOF_INT + // offset, length
Bytes.SIZEOF_LONG;// memstoreTS
/**
* Colon character in UTF-8
*/
public static final char COLUMN_FAMILY_DELIMITER = ':';
public static final byte[] COLUMN_FAMILY_DELIM_ARRAY =
new byte[]{COLUMN_FAMILY_DELIMITER};
/**
* Comparator for plain key/values; i.e. non-catalog table key/values. Works on Key portion
* of KeyValue only.
* @deprecated Use {@link CellComparator#getInstance()} instead. Deprecated for hbase 2.0, remove for hbase 3.0.
*/
@Deprecated
public static final KVComparator COMPARATOR = new KVComparator();
/**
* A {@link KVComparator} for <code>hbase:meta</code> catalog table
* {@link KeyValue}s.
* @deprecated Use {@link MetaCellComparator#META_COMPARATOR} instead.
* Deprecated for hbase 2.0, remove for hbase 3.0.
*/
@Deprecated
public static final KVComparator META_COMPARATOR = new MetaComparator();
/** Size of the key length field in bytes*/
public static final int KEY_LENGTH_SIZE = Bytes.SIZEOF_INT;
/** Size of the key type field in bytes */
public static final int TYPE_SIZE = Bytes.SIZEOF_BYTE;
/** Size of the row length field in bytes */
public static final int ROW_LENGTH_SIZE = Bytes.SIZEOF_SHORT;
/** Size of the family length field in bytes */
public static final int FAMILY_LENGTH_SIZE = Bytes.SIZEOF_BYTE;
/** Size of the timestamp field in bytes */
public static final int TIMESTAMP_SIZE = Bytes.SIZEOF_LONG;
// Size of the timestamp and type byte on end of a key -- a long + a byte.
public static final int TIMESTAMP_TYPE_SIZE = TIMESTAMP_SIZE + TYPE_SIZE;
// Size of the length shorts and bytes in key.
public static final int KEY_INFRASTRUCTURE_SIZE = ROW_LENGTH_SIZE
+ FAMILY_LENGTH_SIZE + TIMESTAMP_TYPE_SIZE;
// How far into the key the row starts at. First thing to read is the short
// that says how long the row is.
public static final int ROW_OFFSET =
Bytes.SIZEOF_INT /*keylength*/ +
Bytes.SIZEOF_INT /*valuelength*/;
public static final int ROW_KEY_OFFSET = ROW_OFFSET + ROW_LENGTH_SIZE;
// Size of the length ints in a KeyValue datastructure.
public static final int KEYVALUE_INFRASTRUCTURE_SIZE = ROW_OFFSET;
/** Size of the tags length field in bytes */
public static final int TAGS_LENGTH_SIZE = Bytes.SIZEOF_SHORT;
public static final int KEYVALUE_WITH_TAGS_INFRASTRUCTURE_SIZE = ROW_OFFSET + TAGS_LENGTH_SIZE;
/**
* Computes the number of bytes that a <code>KeyValue</code> instance with the provided
* characteristics would take up for its underlying data structure.
*
* @param rlength row length
* @param flength family length
* @param qlength qualifier length
* @param vlength value length
*
* @return the <code>KeyValue</code> data structure length
*/
public static long getKeyValueDataStructureSize(int rlength,
int flength, int qlength, int vlength) {
return KeyValue.KEYVALUE_INFRASTRUCTURE_SIZE
+ getKeyDataStructureSize(rlength, flength, qlength) + vlength;
}
/**
* Computes the number of bytes that a <code>KeyValue</code> instance with the provided
* characteristics would take up for its underlying data structure.
*
* @param rlength row length
* @param flength family length
* @param qlength qualifier length
* @param vlength value length
* @param tagsLength total length of the tags
*
* @return the <code>KeyValue</code> data structure length
*/
public static long getKeyValueDataStructureSize(int rlength, int flength, int qlength,
int vlength, int tagsLength) {
if (tagsLength == 0) {
return getKeyValueDataStructureSize(rlength, flength, qlength, vlength);
}
return KeyValue.KEYVALUE_WITH_TAGS_INFRASTRUCTURE_SIZE
+ getKeyDataStructureSize(rlength, flength, qlength) + vlength + tagsLength;
}
/**
* Computes the number of bytes that a <code>KeyValue</code> instance with the provided
* characteristics would take up for its underlying data structure.
*
* @param klength key length
* @param vlength value length
* @param tagsLength total length of the tags
*
* @return the <code>KeyValue</code> data structure length
*/
public static long getKeyValueDataStructureSize(int klength, int vlength, int tagsLength) {
if (tagsLength == 0) {
return (long) KeyValue.KEYVALUE_INFRASTRUCTURE_SIZE + klength + vlength;
}
return (long) KeyValue.KEYVALUE_WITH_TAGS_INFRASTRUCTURE_SIZE + klength + vlength + tagsLength;
}
/**
* Computes the number of bytes that a <code>KeyValue</code> instance with the provided
* characteristics would take up in its underlying data structure for the key.
*
* @param rlength row length
* @param flength family length
* @param qlength qualifier length
*
* @return the key data structure length
*/
public static long getKeyDataStructureSize(int rlength, int flength, int qlength) {
return (long) KeyValue.KEY_INFRASTRUCTURE_SIZE + rlength + flength + qlength;
}
/**
* Key type.
* Has space for other key types to be added later. Cannot rely on
* enum ordinals . They change if item is removed or moved. Do our own codes.
*/
public static enum Type {
Minimum((byte)0),
Put((byte)4),
Delete((byte)8),
DeleteFamilyVersion((byte)10),
DeleteColumn((byte)12),
DeleteFamily((byte)14),
// Maximum is used when searching; you look from maximum on down.
Maximum((byte)255);
private final byte code;
Type(final byte c) {
this.code = c;
}
public byte getCode() {
return this.code;
}
private static Type[] codeArray = new Type[256];
static {
for (Type t : Type.values()) {
codeArray[t.code & 0xff] = t;
}
}
/**
* True to indicate that the byte b is a valid type.
* @param b byte to check
* @return true or false
*/
static boolean isValidType(byte b) {
return codeArray[b & 0xff] != null;
}
/**
* Cannot rely on enum ordinals . They change if item is removed or moved.
* Do our own codes.
* @param b
* @return Type associated with passed code.
*/
public static Type codeToType(final byte b) {
Type t = codeArray[b & 0xff];
if (t != null) {
return t;
}
throw new RuntimeException("Unknown code " + b);
}
}
/**
* Lowest possible key.
* Makes a Key with highest possible Timestamp, empty row and column. No
* key can be equal or lower than this one in memstore or in store file.
*/
public static final KeyValue LOWESTKEY =
new KeyValue(HConstants.EMPTY_BYTE_ARRAY, HConstants.LATEST_TIMESTAMP);
////
// KeyValue core instance fields.
protected byte [] bytes = null; // an immutable byte array that contains the KV
protected int offset = 0; // offset into bytes buffer KV starts at
protected int length = 0; // length of the KV starting from offset.
/** Here be dragons **/
/**
* used to achieve atomic operations in the memstore.
*/
@Override
public long getSequenceId() {
return seqId;
}
@Override
public void setSequenceId(long seqId) {
this.seqId = seqId;
}
// multi-version concurrency control version. default value is 0, aka do not care.
private long seqId = 0;
/** Dragon time over, return to normal business */
/** Writable Constructor -- DO NOT USE */
public KeyValue() {}
/**
* Creates a KeyValue from the start of the specified byte array.
* Presumes <code>bytes</code> content is formatted as a KeyValue blob.
* @param bytes byte array
*/
public KeyValue(final byte [] bytes) {
this(bytes, 0);
}
/**
* Creates a KeyValue from the specified byte array and offset.
* Presumes <code>bytes</code> content starting at <code>offset</code> is
* formatted as a KeyValue blob.
* @param bytes byte array
* @param offset offset to start of KeyValue
*/
public KeyValue(final byte [] bytes, final int offset) {
this(bytes, offset, getLength(bytes, offset));
}
/**
* Creates a KeyValue from the specified byte array, starting at offset, and
* for length <code>length</code>.
* @param bytes byte array
* @param offset offset to start of the KeyValue
* @param length length of the KeyValue
*/
public KeyValue(final byte[] bytes, final int offset, final int length) {
KeyValueUtil.checkKeyValueBytes(bytes, offset, length, true);
this.bytes = bytes;
this.offset = offset;
this.length = length;
}
/**
* Creates a KeyValue from the specified byte array, starting at offset, and
* for length <code>length</code>.
*
* @param bytes byte array
* @param offset offset to start of the KeyValue
* @param length length of the KeyValue
* @param ts
*/
public KeyValue(final byte[] bytes, final int offset, final int length, long ts) {
this(bytes, offset, length, null, 0, 0, null, 0, 0, ts, Type.Maximum, null, 0, 0, null);
}
/** Constructors that build a new backing byte array from fields */
/**
* Constructs KeyValue structure filled with null value.
* Sets type to {@link KeyValue.Type#Maximum}
* @param row - row key (arbitrary byte array)
* @param timestamp
*/
public KeyValue(final byte [] row, final long timestamp) {
this(row, null, null, timestamp, Type.Maximum, null);
}
/**
* Constructs KeyValue structure filled with null value.
* @param row - row key (arbitrary byte array)
* @param timestamp
*/
public KeyValue(final byte [] row, final long timestamp, Type type) {
this(row, null, null, timestamp, type, null);
}
/**
* Constructs KeyValue structure filled with null value.
* Sets type to {@link KeyValue.Type#Maximum}
* @param row - row key (arbitrary byte array)
* @param family family name
* @param qualifier column qualifier
*/
public KeyValue(final byte [] row, final byte [] family,
final byte [] qualifier) {
this(row, family, qualifier, HConstants.LATEST_TIMESTAMP, Type.Maximum);
}
/**
* Constructs KeyValue structure as a put filled with specified values and
* LATEST_TIMESTAMP.
* @param row - row key (arbitrary byte array)
* @param family family name
* @param qualifier column qualifier
*/
public KeyValue(final byte [] row, final byte [] family,
final byte [] qualifier, final byte [] value) {
this(row, family, qualifier, HConstants.LATEST_TIMESTAMP, Type.Put, value);
}
/**
* Constructs KeyValue structure filled with specified values.
* @param row row key
* @param family family name
* @param qualifier column qualifier
* @param timestamp version timestamp
* @param type key type
* @throws IllegalArgumentException
*/
public KeyValue(final byte[] row, final byte[] family,
final byte[] qualifier, final long timestamp, Type type) {
this(row, family, qualifier, timestamp, type, null);
}
/**
* Constructs KeyValue structure filled with specified values.
* @param row row key
* @param family family name
* @param qualifier column qualifier
* @param timestamp version timestamp
* @param value column value
* @throws IllegalArgumentException
*/
public KeyValue(final byte[] row, final byte[] family,
final byte[] qualifier, final long timestamp, final byte[] value) {
this(row, family, qualifier, timestamp, Type.Put, value);
}
/**
* Constructs KeyValue structure filled with specified values.
* @param row row key
* @param family family name
* @param qualifier column qualifier
* @param timestamp version timestamp
* @param value column value
* @param tags tags
* @throws IllegalArgumentException
*/
public KeyValue(final byte[] row, final byte[] family,
final byte[] qualifier, final long timestamp, final byte[] value,
final Tag[] tags) {
this(row, family, qualifier, timestamp, value, tags != null ? Arrays.asList(tags) : null);
}
/**
* Constructs KeyValue structure filled with specified values.
* @param row row key
* @param family family name
* @param qualifier column qualifier
* @param timestamp version timestamp
* @param value column value
* @param tags tags non-empty list of tags or null
* @throws IllegalArgumentException
*/
public KeyValue(final byte[] row, final byte[] family,
final byte[] qualifier, final long timestamp, final byte[] value,
final List<Tag> tags) {
this(row, 0, row==null ? 0 : row.length,
family, 0, family==null ? 0 : family.length,
qualifier, 0, qualifier==null ? 0 : qualifier.length,
timestamp, Type.Put,
value, 0, value==null ? 0 : value.length, tags);
}
/**
* Constructs KeyValue structure filled with specified values.
* @param row row key
* @param family family name
* @param qualifier column qualifier
* @param timestamp version timestamp
* @param type key type
* @param value column value
* @throws IllegalArgumentException
*/
public KeyValue(final byte[] row, final byte[] family,
final byte[] qualifier, final long timestamp, Type type,
final byte[] value) {
this(row, 0, len(row), family, 0, len(family), qualifier, 0, len(qualifier),
timestamp, type, value, 0, len(value));
}
/**
* Constructs KeyValue structure filled with specified values.
* <p>
* Column is split into two fields, family and qualifier.
* @param row row key
* @param family family name
* @param qualifier column qualifier
* @param timestamp version timestamp
* @param type key type
* @param value column value
* @throws IllegalArgumentException
*/
public KeyValue(final byte[] row, final byte[] family,
final byte[] qualifier, final long timestamp, Type type,
final byte[] value, final List<Tag> tags) {
this(row, family, qualifier, 0, qualifier==null ? 0 : qualifier.length,
timestamp, type, value, 0, value==null ? 0 : value.length, tags);
}
/**
* Constructs KeyValue structure filled with specified values.
* @param row row key
* @param family family name
* @param qualifier column qualifier
* @param timestamp version timestamp
* @param type key type
* @param value column value
* @throws IllegalArgumentException
*/
public KeyValue(final byte[] row, final byte[] family,
final byte[] qualifier, final long timestamp, Type type,
final byte[] value, final byte[] tags) {
this(row, family, qualifier, 0, qualifier==null ? 0 : qualifier.length,
timestamp, type, value, 0, value==null ? 0 : value.length, tags);
}
/**
* Constructs KeyValue structure filled with specified values.
* @param row row key
* @param family family name
* @param qualifier column qualifier
* @param qoffset qualifier offset
* @param qlength qualifier length
* @param timestamp version timestamp
* @param type key type
* @param value column value
* @param voffset value offset
* @param vlength value length
* @throws IllegalArgumentException
*/
public KeyValue(byte [] row, byte [] family,
byte [] qualifier, int qoffset, int qlength, long timestamp, Type type,
byte [] value, int voffset, int vlength, List<Tag> tags) {
this(row, 0, row==null ? 0 : row.length,
family, 0, family==null ? 0 : family.length,
qualifier, qoffset, qlength, timestamp, type,
value, voffset, vlength, tags);
}
/**
* @param row
* @param family
* @param qualifier
* @param qoffset
* @param qlength
* @param timestamp
* @param type
* @param value
* @param voffset
* @param vlength
* @param tags
*/
public KeyValue(byte [] row, byte [] family,
byte [] qualifier, int qoffset, int qlength, long timestamp, Type type,
byte [] value, int voffset, int vlength, byte[] tags) {
this(row, 0, row==null ? 0 : row.length,
family, 0, family==null ? 0 : family.length,
qualifier, qoffset, qlength, timestamp, type,
value, voffset, vlength, tags, 0, tags==null ? 0 : tags.length);
}
/**
* Constructs KeyValue structure filled with specified values.
* <p>
* Column is split into two fields, family and qualifier.
* @param row row key
* @throws IllegalArgumentException
*/
public KeyValue(final byte [] row, final int roffset, final int rlength,
final byte [] family, final int foffset, final int flength,
final byte [] qualifier, final int qoffset, final int qlength,
final long timestamp, final Type type,
final byte [] value, final int voffset, final int vlength) {
this(row, roffset, rlength, family, foffset, flength, qualifier, qoffset,
qlength, timestamp, type, value, voffset, vlength, null);
}
/**
* Constructs KeyValue structure filled with specified values. Uses the provided buffer as the
* data buffer.
* <p>
* Column is split into two fields, family and qualifier.
*
* @param buffer the bytes buffer to use
* @param boffset buffer offset
* @param row row key
* @param roffset row offset
* @param rlength row length
* @param family family name
* @param foffset family offset
* @param flength family length
* @param qualifier column qualifier
* @param qoffset qualifier offset
* @param qlength qualifier length
* @param timestamp version timestamp
* @param type key type
* @param value column value
* @param voffset value offset
* @param vlength value length
* @param tags non-empty list of tags or null
* @throws IllegalArgumentException an illegal value was passed or there is insufficient space
* remaining in the buffer
*/
public KeyValue(byte [] buffer, final int boffset,
final byte [] row, final int roffset, final int rlength,
final byte [] family, final int foffset, final int flength,
final byte [] qualifier, final int qoffset, final int qlength,
final long timestamp, final Type type,
final byte [] value, final int voffset, final int vlength,
final Tag[] tags) {
this.bytes = buffer;
this.length = writeByteArray(buffer, boffset,
row, roffset, rlength,
family, foffset, flength, qualifier, qoffset, qlength,
timestamp, type, value, voffset, vlength, tags);
this.offset = boffset;
}
/**
* Constructs KeyValue structure filled with specified values.
* <p>
* Column is split into two fields, family and qualifier.
* @param row row key
* @param roffset row offset
* @param rlength row length
* @param family family name
* @param foffset family offset
* @param flength family length
* @param qualifier column qualifier
* @param qoffset qualifier offset
* @param qlength qualifier length
* @param timestamp version timestamp
* @param type key type
* @param value column value
* @param voffset value offset
* @param vlength value length
* @param tags tags
* @throws IllegalArgumentException
*/
public KeyValue(final byte [] row, final int roffset, final int rlength,
final byte [] family, final int foffset, final int flength,
final byte [] qualifier, final int qoffset, final int qlength,
final long timestamp, final Type type,
final byte [] value, final int voffset, final int vlength,
final List<Tag> tags) {
this.bytes = createByteArray(row, roffset, rlength,
family, foffset, flength, qualifier, qoffset, qlength,
timestamp, type, value, voffset, vlength, tags);
this.length = bytes.length;
this.offset = 0;
}
/**
* @param row
* @param roffset
* @param rlength
* @param family
* @param foffset
* @param flength
* @param qualifier
* @param qoffset
* @param qlength
* @param timestamp
* @param type
* @param value
* @param voffset
* @param vlength
* @param tags
*/
public KeyValue(final byte [] row, final int roffset, final int rlength,
final byte [] family, final int foffset, final int flength,
final byte [] qualifier, final int qoffset, final int qlength,
final long timestamp, final Type type,
final byte [] value, final int voffset, final int vlength,
final byte[] tags, final int tagsOffset, final int tagsLength) {
this.bytes = createByteArray(row, roffset, rlength,
family, foffset, flength, qualifier, qoffset, qlength,
timestamp, type, value, voffset, vlength, tags, tagsOffset, tagsLength);
this.length = bytes.length;
this.offset = 0;
}
/**
* Constructs an empty KeyValue structure, with specified sizes.
* This can be used to partially fill up KeyValues.
* <p>
* Column is split into two fields, family and qualifier.
* @param rlength row length
* @param flength family length
* @param qlength qualifier length
* @param timestamp version timestamp
* @param type key type
* @param vlength value length
* @throws IllegalArgumentException
*/
public KeyValue(final int rlength,
final int flength,
final int qlength,
final long timestamp, final Type type,
final int vlength) {
this(rlength, flength, qlength, timestamp, type, vlength, 0);
}
/**
* Constructs an empty KeyValue structure, with specified sizes.
* This can be used to partially fill up KeyValues.
* <p>
* Column is split into two fields, family and qualifier.
* @param rlength row length
* @param flength family length
* @param qlength qualifier length
* @param timestamp version timestamp
* @param type key type
* @param vlength value length
* @param tagsLength
* @throws IllegalArgumentException
*/
public KeyValue(final int rlength,
final int flength,
final int qlength,
final long timestamp, final Type type,
final int vlength, final int tagsLength) {
this.bytes = createEmptyByteArray(rlength, flength, qlength, timestamp, type, vlength,
tagsLength);
this.length = bytes.length;
this.offset = 0;
}
public KeyValue(byte[] row, int roffset, int rlength,
byte[] family, int foffset, int flength,
ByteBuffer qualifier, long ts, Type type, ByteBuffer value, List<Tag> tags) {
this.bytes = createByteArray(row, roffset, rlength, family, foffset, flength,
qualifier, 0, qualifier == null ? 0 : qualifier.remaining(), ts, type,
value, 0, value == null ? 0 : value.remaining(), tags);
this.length = bytes.length;
this.offset = 0;
}
public KeyValue(Cell c) {
this(c.getRowArray(), c.getRowOffset(), c.getRowLength(),
c.getFamilyArray(), c.getFamilyOffset(), c.getFamilyLength(),
c.getQualifierArray(), c.getQualifierOffset(), c.getQualifierLength(),
c.getTimestamp(), Type.codeToType(c.getTypeByte()), c.getValueArray(), c.getValueOffset(),
c.getValueLength(), c.getTagsArray(), c.getTagsOffset(), c.getTagsLength());
this.seqId = c.getSequenceId();
}
/**
* Create an empty byte[] representing a KeyValue
* All lengths are preset and can be filled in later.
* @param rlength
* @param flength
* @param qlength
* @param timestamp
* @param type
* @param vlength
* @return The newly created byte array.
*/
private static byte[] createEmptyByteArray(final int rlength, int flength,
int qlength, final long timestamp, final Type type, int vlength, int tagsLength) {
if (rlength > Short.MAX_VALUE) {
throw new IllegalArgumentException("Row > " + Short.MAX_VALUE);
}
if (flength > Byte.MAX_VALUE) {
throw new IllegalArgumentException("Family > " + Byte.MAX_VALUE);
}
// Qualifier length
if (qlength > Integer.MAX_VALUE - rlength - flength) {
throw new IllegalArgumentException("Qualifier > " + Integer.MAX_VALUE);
}
RawCell.checkForTagsLength(tagsLength);
// Key length
long longkeylength = getKeyDataStructureSize(rlength, flength, qlength);
if (longkeylength > Integer.MAX_VALUE) {
throw new IllegalArgumentException("keylength " + longkeylength + " > " +
Integer.MAX_VALUE);
}
int keylength = (int)longkeylength;
// Value length
if (vlength > HConstants.MAXIMUM_VALUE_LENGTH) { // FindBugs INT_VACUOUS_COMPARISON
throw new IllegalArgumentException("Valuer > " +
HConstants.MAXIMUM_VALUE_LENGTH);
}
// Allocate right-sized byte array.
byte[] bytes= new byte[(int) getKeyValueDataStructureSize(rlength, flength, qlength, vlength,
tagsLength)];
// Write the correct size markers
int pos = 0;
pos = Bytes.putInt(bytes, pos, keylength);
pos = Bytes.putInt(bytes, pos, vlength);
pos = Bytes.putShort(bytes, pos, (short)(rlength & 0x0000ffff));
pos += rlength;
pos = Bytes.putByte(bytes, pos, (byte)(flength & 0x0000ff));
pos += flength + qlength;
pos = Bytes.putLong(bytes, pos, timestamp);
pos = Bytes.putByte(bytes, pos, type.getCode());
pos += vlength;
if (tagsLength > 0) {
pos = Bytes.putAsShort(bytes, pos, tagsLength);
}
return bytes;
}
/**
* Checks the parameters passed to a constructor.
*
* @param row row key
* @param rlength row length
* @param family family name
* @param flength family length
* @param qlength qualifier length
* @param vlength value length
*
* @throws IllegalArgumentException an illegal value was passed
*/
static void checkParameters(final byte [] row, final int rlength,
final byte [] family, int flength, int qlength, int vlength)
throws IllegalArgumentException {
if (rlength > Short.MAX_VALUE) {
throw new IllegalArgumentException("Row > " + Short.MAX_VALUE);
}
if (row == null) {
throw new IllegalArgumentException("Row is null");
}
// Family length
flength = family == null ? 0 : flength;
if (flength > Byte.MAX_VALUE) {
throw new IllegalArgumentException("Family > " + Byte.MAX_VALUE);
}
// Qualifier length
if (qlength > Integer.MAX_VALUE - rlength - flength) {
throw new IllegalArgumentException("Qualifier > " + Integer.MAX_VALUE);
}
// Key length
long longKeyLength = getKeyDataStructureSize(rlength, flength, qlength);
if (longKeyLength > Integer.MAX_VALUE) {
throw new IllegalArgumentException("keylength " + longKeyLength + " > " +
Integer.MAX_VALUE);
}
// Value length
if (vlength > HConstants.MAXIMUM_VALUE_LENGTH) { // FindBugs INT_VACUOUS_COMPARISON
throw new IllegalArgumentException("Value length " + vlength + " > " +
HConstants.MAXIMUM_VALUE_LENGTH);
}
}
/**
* Write KeyValue format into the provided byte array.
*
* @param buffer the bytes buffer to use
* @param boffset buffer offset
* @param row row key
* @param roffset row offset
* @param rlength row length
* @param family family name
* @param foffset family offset
* @param flength family length
* @param qualifier column qualifier
* @param qoffset qualifier offset
* @param qlength qualifier length
* @param timestamp version timestamp
* @param type key type
* @param value column value
* @param voffset value offset
* @param vlength value length
*
* @return The number of useful bytes in the buffer.
*
* @throws IllegalArgumentException an illegal value was passed or there is insufficient space
* remaining in the buffer
*/
public static int writeByteArray(byte [] buffer, final int boffset,
final byte [] row, final int roffset, final int rlength,
final byte [] family, final int foffset, int flength,
final byte [] qualifier, final int qoffset, int qlength,
final long timestamp, final Type type,
final byte [] value, final int voffset, int vlength, Tag[] tags) {
checkParameters(row, rlength, family, flength, qlength, vlength);
// Calculate length of tags area
int tagsLength = 0;
if (tags != null && tags.length > 0) {
for (Tag t: tags) {
tagsLength += t.getValueLength() + Tag.INFRASTRUCTURE_SIZE;
}
}
RawCell.checkForTagsLength(tagsLength);
int keyLength = (int) getKeyDataStructureSize(rlength, flength, qlength);
int keyValueLength = (int) getKeyValueDataStructureSize(rlength, flength, qlength, vlength,
tagsLength);
if (keyValueLength > buffer.length - boffset) {
throw new IllegalArgumentException("Buffer size " + (buffer.length - boffset) + " < " +
keyValueLength);
}
// Write key, value and key row length.
int pos = boffset;
pos = Bytes.putInt(buffer, pos, keyLength);
pos = Bytes.putInt(buffer, pos, vlength);
pos = Bytes.putShort(buffer, pos, (short)(rlength & 0x0000ffff));
pos = Bytes.putBytes(buffer, pos, row, roffset, rlength);
pos = Bytes.putByte(buffer, pos, (byte) (flength & 0x0000ff));
if (flength != 0) {
pos = Bytes.putBytes(buffer, pos, family, foffset, flength);
}
if (qlength != 0) {
pos = Bytes.putBytes(buffer, pos, qualifier, qoffset, qlength);
}
pos = Bytes.putLong(buffer, pos, timestamp);
pos = Bytes.putByte(buffer, pos, type.getCode());
if (value != null && value.length > 0) {
pos = Bytes.putBytes(buffer, pos, value, voffset, vlength);
}
// Write the number of tags. If it is 0 then it means there are no tags.
if (tagsLength > 0) {
pos = Bytes.putAsShort(buffer, pos, tagsLength);
for (Tag t : tags) {
int tlen = t.getValueLength();
pos = Bytes.putAsShort(buffer, pos, tlen + Tag.TYPE_LENGTH_SIZE);
pos = Bytes.putByte(buffer, pos, t.getType());
Tag.copyValueTo(t, buffer, pos);
pos += tlen;
}
}
return keyValueLength;
}
/**
* Write KeyValue format into a byte array.
* @param row row key
* @param roffset row offset
* @param rlength row length
* @param family family name
* @param foffset family offset
* @param flength family length
* @param qualifier column qualifier
* @param qoffset qualifier offset
* @param qlength qualifier length
* @param timestamp version timestamp
* @param type key type
* @param value column value
* @param voffset value offset
* @param vlength value length
* @return The newly created byte array.
*/
private static byte [] createByteArray(final byte [] row, final int roffset,
final int rlength, final byte [] family, final int foffset, int flength,
final byte [] qualifier, final int qoffset, int qlength,
final long timestamp, final Type type,
final byte [] value, final int voffset,
int vlength, byte[] tags, int tagsOffset, int tagsLength) {
checkParameters(row, rlength, family, flength, qlength, vlength);
RawCell.checkForTagsLength(tagsLength);
// Allocate right-sized byte array.
int keyLength = (int) getKeyDataStructureSize(rlength, flength, qlength);
byte[] bytes = new byte[(int) getKeyValueDataStructureSize(rlength, flength, qlength, vlength,
tagsLength)];
// Write key, value and key row length.
int pos = 0;
pos = Bytes.putInt(bytes, pos, keyLength);
pos = Bytes.putInt(bytes, pos, vlength);
pos = Bytes.putShort(bytes, pos, (short)(rlength & 0x0000ffff));
pos = Bytes.putBytes(bytes, pos, row, roffset, rlength);
pos = Bytes.putByte(bytes, pos, (byte)(flength & 0x0000ff));
if(flength != 0) {
pos = Bytes.putBytes(bytes, pos, family, foffset, flength);
}
if(qlength != 0) {
pos = Bytes.putBytes(bytes, pos, qualifier, qoffset, qlength);
}
pos = Bytes.putLong(bytes, pos, timestamp);
pos = Bytes.putByte(bytes, pos, type.getCode());
if (value != null && value.length > 0) {
pos = Bytes.putBytes(bytes, pos, value, voffset, vlength);
}
// Add the tags after the value part
if (tagsLength > 0) {
pos = Bytes.putAsShort(bytes, pos, tagsLength);
pos = Bytes.putBytes(bytes, pos, tags, tagsOffset, tagsLength);
}
return bytes;
}
/**
* @param qualifier can be a ByteBuffer or a byte[], or null.
* @param value can be a ByteBuffer or a byte[], or null.
*/
private static byte [] createByteArray(final byte [] row, final int roffset,
final int rlength, final byte [] family, final int foffset, int flength,
final Object qualifier, final int qoffset, int qlength,
final long timestamp, final Type type,
final Object value, final int voffset, int vlength, List<Tag> tags) {
checkParameters(row, rlength, family, flength, qlength, vlength);
// Calculate length of tags area
int tagsLength = 0;
if (tags != null && !tags.isEmpty()) {
for (Tag t : tags) {
tagsLength += t.getValueLength() + Tag.INFRASTRUCTURE_SIZE;
}
}
RawCell.checkForTagsLength(tagsLength);
// Allocate right-sized byte array.
int keyLength = (int) getKeyDataStructureSize(rlength, flength, qlength);
byte[] bytes = new byte[(int) getKeyValueDataStructureSize(rlength, flength, qlength, vlength,
tagsLength)];
// Write key, value and key row length.
int pos = 0;
pos = Bytes.putInt(bytes, pos, keyLength);
pos = Bytes.putInt(bytes, pos, vlength);
pos = Bytes.putShort(bytes, pos, (short)(rlength & 0x0000ffff));
pos = Bytes.putBytes(bytes, pos, row, roffset, rlength);
pos = Bytes.putByte(bytes, pos, (byte)(flength & 0x0000ff));
if(flength != 0) {
pos = Bytes.putBytes(bytes, pos, family, foffset, flength);
}
if (qlength > 0) {
if (qualifier instanceof ByteBuffer) {
pos = Bytes.putByteBuffer(bytes, pos, (ByteBuffer) qualifier);
} else {
pos = Bytes.putBytes(bytes, pos, (byte[]) qualifier, qoffset, qlength);
}
}
pos = Bytes.putLong(bytes, pos, timestamp);
pos = Bytes.putByte(bytes, pos, type.getCode());
if (vlength > 0) {
if (value instanceof ByteBuffer) {
pos = Bytes.putByteBuffer(bytes, pos, (ByteBuffer) value);
} else {
pos = Bytes.putBytes(bytes, pos, (byte[]) value, voffset, vlength);
}
}
// Add the tags after the value part
if (tagsLength > 0) {
pos = Bytes.putAsShort(bytes, pos, tagsLength);
for (Tag t : tags) {
int tlen = t.getValueLength();
pos = Bytes.putAsShort(bytes, pos, tlen + Tag.TYPE_LENGTH_SIZE);
pos = Bytes.putByte(bytes, pos, t.getType());
Tag.copyValueTo(t, bytes, pos);
pos += tlen;
}
}
return bytes;
}
/**
* Needed doing 'contains' on List. Only compares the key portion, not the value.
*/
@Override
public boolean equals(Object other) {
if (!(other instanceof Cell)) {
return false;
}
return CellUtil.equals(this, (Cell)other);
}
/**
* In line with {@link #equals(Object)}, only uses the key portion, not the value.
*/
@Override
public int hashCode() {
return calculateHashForKey(this);
}
private int calculateHashForKey(Cell cell) {
// pre-calculate the 3 hashes made of byte ranges
int rowHash = Bytes.hashCode(cell.getRowArray(), cell.getRowOffset(), cell.getRowLength());
int familyHash = Bytes.hashCode(cell.getFamilyArray(), cell.getFamilyOffset(),
cell.getFamilyLength());
int qualifierHash = Bytes.hashCode(cell.getQualifierArray(), cell.getQualifierOffset(),
cell.getQualifierLength());
// combine the 6 sub-hashes
int hash = 31 * rowHash + familyHash;
hash = 31 * hash + qualifierHash;
hash = 31 * hash + (int) cell.getTimestamp();
hash = 31 * hash + cell.getTypeByte();
return hash;
}
//---------------------------------------------------------------------------
//
// KeyValue cloning
//
//---------------------------------------------------------------------------
/**
* Clones a KeyValue. This creates a copy, re-allocating the buffer.
* @return Fully copied clone of this KeyValue
* @throws CloneNotSupportedException
*/
@Override
public KeyValue clone() throws CloneNotSupportedException {
super.clone();
byte [] b = new byte[this.length];
System.arraycopy(this.bytes, this.offset, b, 0, this.length);
KeyValue ret = new KeyValue(b, 0, b.length);
// Important to clone the memstoreTS as well - otherwise memstore's
// update-in-place methods (eg increment) will end up creating
// new entries
ret.setSequenceId(seqId);
return ret;
}
/**
* Creates a shallow copy of this KeyValue, reusing the data byte buffer.
* http://en.wikipedia.org/wiki/Object_copy
* @return Shallow copy of this KeyValue
*/
public KeyValue shallowCopy() {
KeyValue shallowCopy = new KeyValue(this.bytes, this.offset, this.length);
shallowCopy.setSequenceId(this.seqId);
return shallowCopy;
}
//---------------------------------------------------------------------------
//
// String representation
//
//---------------------------------------------------------------------------
@Override
public String toString() {
if (this.bytes == null || this.bytes.length == 0) {
return "empty";
}
return keyToString(this.bytes, this.offset + ROW_OFFSET, getKeyLength()) + "/vlen="
+ getValueLength() + "/seqid=" + seqId;
}
/**
* @param k Key portion of a KeyValue.
* @return Key as a String, empty string if k is null.
*/
public static String keyToString(final byte [] k) {
if (k == null) {
return "";
}
return keyToString(k, 0, k.length);
}
/**
* Produces a string map for this key/value pair. Useful for programmatic use
* and manipulation of the data stored in an WALKey, for example, printing
* as JSON. Values are left out due to their tendency to be large. If needed,
* they can be added manually.
*
* @return the Map&lt;String,?&gt; containing data from this key
*/
public Map<String, Object> toStringMap() {
Map<String, Object> stringMap = new HashMap<>();
stringMap.put("row", Bytes.toStringBinary(getRowArray(), getRowOffset(), getRowLength()));
stringMap.put("family",
Bytes.toStringBinary(getFamilyArray(), getFamilyOffset(), getFamilyLength()));
stringMap.put("qualifier",
Bytes.toStringBinary(getQualifierArray(), getQualifierOffset(), getQualifierLength()));
stringMap.put("timestamp", getTimestamp());
stringMap.put("vlen", getValueLength());
Iterator<Tag> tags = getTags();
if (tags != null) {
List<String> tagsString = new ArrayList<String>();
while (tags.hasNext()) {
tagsString.add(tags.next().toString());
}
stringMap.put("tag", tagsString);
}
return stringMap;
}
/**
* Use for logging.
* @param b Key portion of a KeyValue.
* @param o Offset to start of key
* @param l Length of key.
* @return Key as a String.
*/
public static String keyToString(final byte [] b, final int o, final int l) {
if (b == null) return "";
int rowlength = Bytes.toShort(b, o);
String row = Bytes.toStringBinary(b, o + Bytes.SIZEOF_SHORT, rowlength);
int columnoffset = o + Bytes.SIZEOF_SHORT + 1 + rowlength;
int familylength = b[columnoffset - 1];
int columnlength = l - ((columnoffset - o) + TIMESTAMP_TYPE_SIZE);
String family = familylength == 0? "":
Bytes.toStringBinary(b, columnoffset, familylength);
String qualifier = columnlength == 0? "":
Bytes.toStringBinary(b, columnoffset + familylength,
columnlength - familylength);
long timestamp = Bytes.toLong(b, o + (l - TIMESTAMP_TYPE_SIZE));
String timestampStr = humanReadableTimestamp(timestamp);
byte type = b[o + l - 1];
return row + "/" + family +
(family != null && family.length() > 0? ":" :"") +
qualifier + "/" + timestampStr + "/" + Type.codeToType(type);
}
public static String humanReadableTimestamp(final long timestamp) {
if (timestamp == HConstants.LATEST_TIMESTAMP) {
return "LATEST_TIMESTAMP";
}
if (timestamp == HConstants.OLDEST_TIMESTAMP) {
return "OLDEST_TIMESTAMP";
}
return String.valueOf(timestamp);
}
//---------------------------------------------------------------------------
//
// Public Member Accessors
//
//---------------------------------------------------------------------------
/**
* To be used only in tests where the Cells are clearly assumed to be of type KeyValue
* and that we need access to the backing array to do some test case related assertions.
* @return The byte array backing this KeyValue.
*/
public byte [] getBuffer() {
return this.bytes;
}
/**
* @return Offset into {@link #getBuffer()} at which this KeyValue starts.
*/
public int getOffset() {
return this.offset;
}
/**
* @return Length of bytes this KeyValue occupies in {@link #getBuffer()}.
*/
public int getLength() {
return length;
}
//---------------------------------------------------------------------------
//
// Length and Offset Calculators
//
//---------------------------------------------------------------------------
/**
* Determines the total length of the KeyValue stored in the specified
* byte array and offset. Includes all headers.
* @param bytes byte array
* @param offset offset to start of the KeyValue
* @return length of entire KeyValue, in bytes
*/
private static int getLength(byte [] bytes, int offset) {
int klength = ROW_OFFSET + Bytes.toInt(bytes, offset);
int vlength = Bytes.toInt(bytes, offset + Bytes.SIZEOF_INT);
return klength + vlength;
}
/**
* @return Key offset in backing buffer..
*/
public int getKeyOffset() {
return this.offset + ROW_OFFSET;
}
public String getKeyString() {
return Bytes.toStringBinary(getBuffer(), getKeyOffset(), getKeyLength());
}
/**
* @return Length of key portion.
*/
public int getKeyLength() {
return Bytes.toInt(this.bytes, this.offset);
}
/**
* @return the backing array of the entire KeyValue (all KeyValue fields are in a single array)
*/
@Override
public byte[] getValueArray() {
return bytes;
}
/**
* @return the value offset
*/
@Override
public int getValueOffset() {
int voffset = getKeyOffset() + getKeyLength();
return voffset;
}
/**
* @return Value length
*/
@Override
public int getValueLength() {
int vlength = Bytes.toInt(this.bytes, this.offset + Bytes.SIZEOF_INT);
return vlength;
}
/**
* @return the backing array of the entire KeyValue (all KeyValue fields are in a single array)
*/
@Override
public byte[] getRowArray() {
return bytes;
}
/**
* @return Row offset
*/
@Override
public int getRowOffset() {
return this.offset + ROW_KEY_OFFSET;
}
/**
* @return Row length
*/
@Override
public short getRowLength() {
return Bytes.toShort(this.bytes, getKeyOffset());
}
/**
* @return the backing array of the entire KeyValue (all KeyValue fields are in a single array)
*/
@Override
public byte[] getFamilyArray() {
return bytes;
}
/**
* @return Family offset
*/
@Override
public int getFamilyOffset() {
return getFamilyOffset(getRowLength());
}
/**
* @return Family offset
*/
private int getFamilyOffset(int rlength) {
return this.offset + ROW_KEY_OFFSET + rlength + Bytes.SIZEOF_BYTE;
}
/**
* @return Family length
*/
@Override
public byte getFamilyLength() {
return getFamilyLength(getFamilyOffset());
}
/**
* @return Family length
*/
public byte getFamilyLength(int foffset) {
return this.bytes[foffset-1];
}
/**
* @return the backing array of the entire KeyValue (all KeyValue fields are in a single array)
*/
@Override
public byte[] getQualifierArray() {
return bytes;
}
/**
* @return Qualifier offset
*/
@Override
public int getQualifierOffset() {
return getQualifierOffset(getFamilyOffset());
}
/**
* @return Qualifier offset
*/
private int getQualifierOffset(int foffset) {
return foffset + getFamilyLength(foffset);
}
/**
* @return Qualifier length
*/
@Override
public int getQualifierLength() {
return getQualifierLength(getRowLength(),getFamilyLength());
}
/**
* @return Qualifier length
*/
private int getQualifierLength(int rlength, int flength) {
return getKeyLength() - (int) getKeyDataStructureSize(rlength, flength, 0);
}
/**
* @return Timestamp offset
*/
public int getTimestampOffset() {
return getTimestampOffset(getKeyLength());
}
/**
* @param keylength Pass if you have it to save on a int creation.
* @return Timestamp offset
*/
private int getTimestampOffset(final int keylength) {
return getKeyOffset() + keylength - TIMESTAMP_TYPE_SIZE;
}
/**
* @return True if this KeyValue has a LATEST_TIMESTAMP timestamp.
*/
public boolean isLatestTimestamp() {
return Bytes.equals(getBuffer(), getTimestampOffset(), Bytes.SIZEOF_LONG,
HConstants.LATEST_TIMESTAMP_BYTES, 0, Bytes.SIZEOF_LONG);
}
/**
* @param now Time to set into <code>this</code> IFF timestamp ==
* {@link HConstants#LATEST_TIMESTAMP} (else, its a noop).
* @return True is we modified this.
*/
public boolean updateLatestStamp(final byte [] now) {
if (this.isLatestTimestamp()) {
int tsOffset = getTimestampOffset();
System.arraycopy(now, 0, this.bytes, tsOffset, Bytes.SIZEOF_LONG);
// clear cache or else getTimestamp() possibly returns an old value
return true;
}
return false;
}
@Override
public void setTimestamp(long ts) {
Bytes.putBytes(this.bytes, this.getTimestampOffset(), Bytes.toBytes(ts), 0, Bytes.SIZEOF_LONG);
}
@Override
public void setTimestamp(byte[] ts) {
Bytes.putBytes(this.bytes, this.getTimestampOffset(), ts, 0, Bytes.SIZEOF_LONG);
}
//---------------------------------------------------------------------------
//
// Methods that return copies of fields
//
//---------------------------------------------------------------------------
/**
* Do not use unless you have to. Used internally for compacting and testing. Use
* {@link #getRowArray()}, {@link #getFamilyArray()}, {@link #getQualifierArray()}, and
* {@link #getValueArray()} if accessing a KeyValue client-side.
* @return Copy of the key portion only.
*/
public byte [] getKey() {
int keylength = getKeyLength();
byte [] key = new byte[keylength];
System.arraycopy(getBuffer(), getKeyOffset(), key, 0, keylength);
return key;
}
/**
*
* @return Timestamp
*/
@Override
public long getTimestamp() {
return getTimestamp(getKeyLength());
}
/**
* @param keylength Pass if you have it to save on a int creation.
* @return Timestamp
*/
long getTimestamp(final int keylength) {
int tsOffset = getTimestampOffset(keylength);
return Bytes.toLong(this.bytes, tsOffset);
}
/**
* @return KeyValue.TYPE byte representation
*/
@Override
public byte getTypeByte() {
return this.bytes[this.offset + getKeyLength() - 1 + ROW_OFFSET];
}
/**
* This returns the offset where the tag actually starts.
*/
@Override
public int getTagsOffset() {
int tagsLen = getTagsLength();
if (tagsLen == 0) {
return this.offset + this.length;
}
return this.offset + this.length - tagsLen;
}
/**
* This returns the total length of the tag bytes
*/
@Override
public int getTagsLength() {
int tagsLen = this.length - (getKeyLength() + getValueLength() + KEYVALUE_INFRASTRUCTURE_SIZE);
if (tagsLen > 0) {
// There are some Tag bytes in the byte[]. So reduce 2 bytes which is added to denote the tags
// length
tagsLen -= TAGS_LENGTH_SIZE;
}
return tagsLen;
}
/**
* @return the backing array of the entire KeyValue (all KeyValue fields are in a single array)
*/
@Override
public byte[] getTagsArray() {
return bytes;
}
/**
* Creates a new KeyValue that only contains the key portion (the value is
* set to be null).
*
* TODO only used by KeyOnlyFilter -- move there.
* @param lenAsVal replace value with the actual value length (false=empty)
*/
public KeyValue createKeyOnly(boolean lenAsVal) {
// KV format: <keylen:4><valuelen:4><key:keylen><value:valuelen>
// Rebuild as: <keylen:4><0:4><key:keylen>
int dataLen = lenAsVal? Bytes.SIZEOF_INT : 0;
byte [] newBuffer = new byte[getKeyLength() + ROW_OFFSET + dataLen];
System.arraycopy(this.bytes, this.offset, newBuffer, 0,
Math.min(newBuffer.length,this.length));
Bytes.putInt(newBuffer, Bytes.SIZEOF_INT, dataLen);
if (lenAsVal) {
Bytes.putInt(newBuffer, newBuffer.length - dataLen, this.getValueLength());
}
return new KeyValue(newBuffer);
}
/**
* @param b
* @param delimiter
* @return Index of delimiter having started from start of <code>b</code>
* moving rightward.
*/
public static int getDelimiter(final byte [] b, int offset, final int length,
final int delimiter) {
if (b == null) {
throw new IllegalArgumentException("Passed buffer is null");
}
int result = -1;
for (int i = offset; i < length + offset; i++) {
if (b[i] == delimiter) {
result = i;
break;
}
}
return result;
}
/**
* Find index of passed delimiter walking from end of buffer backwards.
* @param b
* @param delimiter
* @return Index of delimiter
*/
public static int getDelimiterInReverse(final byte [] b, final int offset,
final int length, final int delimiter) {
if (b == null) {
throw new IllegalArgumentException("Passed buffer is null");
}
int result = -1;
for (int i = (offset + length) - 1; i >= offset; i--) {
if (b[i] == delimiter) {
result = i;
break;
}
}
return result;
}
/**
* A {@link KVComparator} for <code>hbase:meta</code> catalog table
* {@link KeyValue}s.
* @deprecated : {@link MetaCellComparator#META_COMPARATOR} to be used.
* Deprecated for hbase 2.0, remove for hbase 3.0.
*/
@Deprecated
public static class MetaComparator extends KVComparator {
/**
* Compare key portion of a {@link KeyValue} for keys in <code>hbase:meta</code>
* table.
*/
@Override
public int compare(final Cell left, final Cell right) {
return PrivateCellUtil.compareKeyIgnoresMvcc(MetaCellComparator.META_COMPARATOR, left,
right);
}
@Override
public int compareOnlyKeyPortion(Cell left, Cell right) {
return compare(left, right);
}
@Override
public int compareRows(byte [] left, int loffset, int llength,
byte [] right, int roffset, int rlength) {
int leftDelimiter = getDelimiter(left, loffset, llength,
HConstants.DELIMITER);
int rightDelimiter = getDelimiter(right, roffset, rlength,
HConstants.DELIMITER);
// Compare up to the delimiter
int lpart = (leftDelimiter < 0 ? llength :leftDelimiter - loffset);
int rpart = (rightDelimiter < 0 ? rlength :rightDelimiter - roffset);
int result = Bytes.compareTo(left, loffset, lpart, right, roffset, rpart);
if (result != 0) {
return result;
} else {
if (leftDelimiter < 0 && rightDelimiter >= 0) {
return -1;
} else if (rightDelimiter < 0 && leftDelimiter >= 0) {
return 1;
} else if (leftDelimiter < 0 && rightDelimiter < 0) {
return 0;
}
}
// Compare middle bit of the row.
// Move past delimiter
leftDelimiter++;
rightDelimiter++;
int leftFarDelimiter = getDelimiterInReverse(left, leftDelimiter,
llength - (leftDelimiter - loffset), HConstants.DELIMITER);
int rightFarDelimiter = getDelimiterInReverse(right,
rightDelimiter, rlength - (rightDelimiter - roffset),
HConstants.DELIMITER);
// Now compare middlesection of row.
lpart = (leftFarDelimiter < 0 ? llength + loffset: leftFarDelimiter) - leftDelimiter;
rpart = (rightFarDelimiter < 0 ? rlength + roffset: rightFarDelimiter)- rightDelimiter;
result = super.compareRows(left, leftDelimiter, lpart, right, rightDelimiter, rpart);
if (result != 0) {
return result;
} else {
if (leftDelimiter < 0 && rightDelimiter >= 0) {
return -1;
} else if (rightDelimiter < 0 && leftDelimiter >= 0) {
return 1;
} else if (leftDelimiter < 0 && rightDelimiter < 0) {
return 0;
}
}
// Compare last part of row, the rowid.
leftFarDelimiter++;
rightFarDelimiter++;
result = Bytes.compareTo(left, leftFarDelimiter, llength - (leftFarDelimiter - loffset),
right, rightFarDelimiter, rlength - (rightFarDelimiter - roffset));
return result;
}
/**
* Don't do any fancy Block Index splitting tricks.
*/
@Override
public byte[] getShortMidpointKey(final byte[] leftKey, final byte[] rightKey) {
return Arrays.copyOf(rightKey, rightKey.length);
}
/**
* The HFileV2 file format's trailer contains this class name. We reinterpret this and
* instantiate the appropriate comparator.
* TODO: With V3 consider removing this.
* @return legacy class name for FileFileTrailer#comparatorClassName
*/
@Override
public String getLegacyKeyComparatorName() {
return "org.apache.hadoop.hbase.KeyValue$MetaKeyComparator";
}
@Override
protected Object clone() throws CloneNotSupportedException {
return new MetaComparator();
}
/**
* Override the row key comparison to parse and compare the meta row key parts.
*/
@Override
protected int compareRowKey(final Cell l, final Cell r) {
byte[] left = l.getRowArray();
int loffset = l.getRowOffset();
int llength = l.getRowLength();
byte[] right = r.getRowArray();
int roffset = r.getRowOffset();
int rlength = r.getRowLength();
return compareRows(left, loffset, llength, right, roffset, rlength);
}
}
/**
* Compare KeyValues. When we compare KeyValues, we only compare the Key
* portion. This means two KeyValues with same Key but different Values are
* considered the same as far as this Comparator is concerned.
* @deprecated : Use {@link CellComparatorImpl}. Deprecated for hbase 2.0, remove for hbase 3.0.
*/
@Deprecated
public static class KVComparator implements RawComparator<Cell>, SamePrefixComparator<byte[]> {
/**
* The HFileV2 file format's trailer contains this class name. We reinterpret this and
* instantiate the appropriate comparator.
* TODO: With V3 consider removing this.
* @return legacy class name for FileFileTrailer#comparatorClassName
*/
public String getLegacyKeyComparatorName() {
return "org.apache.hadoop.hbase.KeyValue$KeyComparator";
}
@Override // RawComparator
public int compare(byte[] l, int loff, int llen, byte[] r, int roff, int rlen) {
return compareFlatKey(l,loff,llen, r,roff,rlen);
}
/**
* Compares the only the user specified portion of a Key. This is overridden by MetaComparator.
* @param left
* @param right
* @return 0 if equal, &lt;0 if left smaller, &gt;0 if right smaller
*/
protected int compareRowKey(final Cell left, final Cell right) {
return CellComparatorImpl.COMPARATOR.compareRows(left, right);
}
/**
* Compares left to right assuming that left,loffset,llength and right,roffset,rlength are
* full KVs laid out in a flat byte[]s.
* @param left
* @param loffset
* @param llength
* @param right
* @param roffset
* @param rlength
* @return 0 if equal, &lt;0 if left smaller, &gt;0 if right smaller
*/
public int compareFlatKey(byte[] left, int loffset, int llength,
byte[] right, int roffset, int rlength) {
// Compare row
short lrowlength = Bytes.toShort(left, loffset);
short rrowlength = Bytes.toShort(right, roffset);
int compare = compareRows(left, loffset + Bytes.SIZEOF_SHORT,
lrowlength, right, roffset + Bytes.SIZEOF_SHORT, rrowlength);
if (compare != 0) {
return compare;
}
// Compare the rest of the two KVs without making any assumptions about
// the common prefix. This function will not compare rows anyway, so we
// don't need to tell it that the common prefix includes the row.
return compareWithoutRow(0, left, loffset, llength, right, roffset,
rlength, rrowlength);
}
public int compareFlatKey(byte[] left, byte[] right) {
return compareFlatKey(left, 0, left.length, right, 0, right.length);
}
// compare a key against row/fam/qual/ts/type
public int compareKey(Cell cell,
byte[] row, int roff, int rlen,
byte[] fam, int foff, int flen,
byte[] col, int coff, int clen,
long ts, byte type) {
int compare = compareRows(
cell.getRowArray(), cell.getRowOffset(), cell.getRowLength(),
row, roff, rlen);
if (compare != 0) {
return compare;
}
// If the column is not specified, the "minimum" key type appears the
// latest in the sorted order, regardless of the timestamp. This is used
// for specifying the last key/value in a given row, because there is no
// "lexicographically last column" (it would be infinitely long). The
// "maximum" key type does not need this behavior.
if (cell.getFamilyLength() + cell.getQualifierLength() == 0
&& cell.getTypeByte() == Type.Minimum.getCode()) {
// left is "bigger", i.e. it appears later in the sorted order
return 1;
}
if (flen+clen == 0 && type == Type.Minimum.getCode()) {
return -1;
}
compare = compareFamilies(
cell.getFamilyArray(), cell.getFamilyOffset(), cell.getFamilyLength(),
fam, foff, flen);
if (compare != 0) {
return compare;
}
compare = compareColumns(
cell.getQualifierArray(), cell.getQualifierOffset(), cell.getQualifierLength(),
col, coff, clen);
if (compare != 0) {
return compare;
}
// Next compare timestamps.
compare = compareTimestamps(cell.getTimestamp(), ts);
if (compare != 0) {
return compare;
}
// Compare types. Let the delete types sort ahead of puts; i.e. types
// of higher numbers sort before those of lesser numbers. Maximum (255)
// appears ahead of everything, and minimum (0) appears after
// everything.
return (0xff & type) - (0xff & cell.getTypeByte());
}
public int compareOnlyKeyPortion(Cell left, Cell right) {
return PrivateCellUtil.compareKeyIgnoresMvcc(CellComparatorImpl.COMPARATOR, left, right);
}
/**
* Compares the Key of a cell -- with fields being more significant in this order:
* rowkey, colfam/qual, timestamp, type, mvcc
*/
@Override
public int compare(final Cell left, final Cell right) {
int compare = CellComparatorImpl.COMPARATOR.compare(left, right);
return compare;
}
public int compareTimestamps(final Cell left, final Cell right) {
return CellComparatorImpl.COMPARATOR.compareTimestamps(left, right);
}
/**
* @param left
* @param right
* @return Result comparing rows.
*/
public int compareRows(final Cell left, final Cell right) {
return compareRows(left.getRowArray(),left.getRowOffset(), left.getRowLength(),
right.getRowArray(), right.getRowOffset(), right.getRowLength());
}
/**
* Get the b[],o,l for left and right rowkey portions and compare.
* @param left
* @param loffset
* @param llength
* @param right
* @param roffset
* @param rlength
* @return 0 if equal, &lt;0 if left smaller, &gt;0 if right smaller
*/
public int compareRows(byte [] left, int loffset, int llength,
byte [] right, int roffset, int rlength) {
return Bytes.compareTo(left, loffset, llength, right, roffset, rlength);
}
int compareColumns(final Cell left, final short lrowlength, final Cell right,
final short rrowlength) {
return CellComparatorImpl.COMPARATOR.compareColumns(left, right);
}
protected int compareColumns(
byte [] left, int loffset, int llength, final int lfamilylength,
byte [] right, int roffset, int rlength, final int rfamilylength) {
// Compare family portion first.
int diff = Bytes.compareTo(left, loffset, lfamilylength,
right, roffset, rfamilylength);
if (diff != 0) {
return diff;
}
// Compare qualifier portion
return Bytes.compareTo(left, loffset + lfamilylength,
llength - lfamilylength,
right, roffset + rfamilylength, rlength - rfamilylength);
}
static int compareTimestamps(final long ltimestamp, final long rtimestamp) {
// The below older timestamps sorting ahead of newer timestamps looks
// wrong but it is intentional. This way, newer timestamps are first
// found when we iterate over a memstore and newer versions are the
// first we trip over when reading from a store file.
if (ltimestamp < rtimestamp) {
return 1;
} else if (ltimestamp > rtimestamp) {
return -1;
}
return 0;
}
/**
* Overridden
* @param commonPrefix
* @param left
* @param loffset
* @param llength
* @param right
* @param roffset
* @param rlength
* @return 0 if equal, &lt;0 if left smaller, &gt;0 if right smaller
*/
@Override // SamePrefixComparator
public int compareIgnoringPrefix(int commonPrefix, byte[] left,
int loffset, int llength, byte[] right, int roffset, int rlength) {
// Compare row
short lrowlength = Bytes.toShort(left, loffset);
short rrowlength;
int comparisonResult = 0;
if (commonPrefix < ROW_LENGTH_SIZE) {
// almost nothing in common
rrowlength = Bytes.toShort(right, roffset);
comparisonResult = compareRows(left, loffset + ROW_LENGTH_SIZE,
lrowlength, right, roffset + ROW_LENGTH_SIZE, rrowlength);
} else { // the row length is the same
rrowlength = lrowlength;
if (commonPrefix < ROW_LENGTH_SIZE + rrowlength) {
// The rows are not the same. Exclude the common prefix and compare
// the rest of the two rows.
int common = commonPrefix - ROW_LENGTH_SIZE;
comparisonResult = compareRows(
left, loffset + common + ROW_LENGTH_SIZE, lrowlength - common,
right, roffset + common + ROW_LENGTH_SIZE, rrowlength - common);
}
}
if (comparisonResult != 0) {
return comparisonResult;
}
assert lrowlength == rrowlength;
return compareWithoutRow(commonPrefix, left, loffset, llength, right,
roffset, rlength, lrowlength);
}
/**
* Compare columnFamily, qualifier, timestamp, and key type (everything
* except the row). This method is used both in the normal comparator and
* the "same-prefix" comparator. Note that we are assuming that row portions
* of both KVs have already been parsed and found identical, and we don't
* validate that assumption here.
* @param commonPrefix
* the length of the common prefix of the two key-values being
* compared, including row length and row
*/
private int compareWithoutRow(int commonPrefix, byte[] left, int loffset,
int llength, byte[] right, int roffset, int rlength, short rowlength) {
/***
* KeyValue Format and commonLength:
* |_keyLen_|_valLen_|_rowLen_|_rowKey_|_famiLen_|_fami_|_Quali_|....
* ------------------|-------commonLength--------|--------------
*/
int commonLength = ROW_LENGTH_SIZE + FAMILY_LENGTH_SIZE + rowlength;
// commonLength + TIMESTAMP_TYPE_SIZE
int commonLengthWithTSAndType = TIMESTAMP_TYPE_SIZE + commonLength;
// ColumnFamily + Qualifier length.
int lcolumnlength = llength - commonLengthWithTSAndType;
int rcolumnlength = rlength - commonLengthWithTSAndType;
byte ltype = left[loffset + (llength - 1)];
byte rtype = right[roffset + (rlength - 1)];
// If the column is not specified, the "minimum" key type appears the
// latest in the sorted order, regardless of the timestamp. This is used
// for specifying the last key/value in a given row, because there is no
// "lexicographically last column" (it would be infinitely long). The
// "maximum" key type does not need this behavior.
if (lcolumnlength == 0 && ltype == Type.Minimum.getCode()) {
// left is "bigger", i.e. it appears later in the sorted order
return 1;
}
if (rcolumnlength == 0 && rtype == Type.Minimum.getCode()) {
return -1;
}
int lfamilyoffset = commonLength + loffset;
int rfamilyoffset = commonLength + roffset;
// Column family length.
int lfamilylength = left[lfamilyoffset - 1];
int rfamilylength = right[rfamilyoffset - 1];
// If left family size is not equal to right family size, we need not
// compare the qualifiers.
boolean sameFamilySize = (lfamilylength == rfamilylength);
int common = 0;
if (commonPrefix > 0) {
common = Math.max(0, commonPrefix - commonLength);
if (!sameFamilySize) {
// Common should not be larger than Math.min(lfamilylength,
// rfamilylength).
common = Math.min(common, Math.min(lfamilylength, rfamilylength));
} else {
common = Math.min(common, Math.min(lcolumnlength, rcolumnlength));
}
}
if (!sameFamilySize) {
// comparing column family is enough.
return Bytes.compareTo(left, lfamilyoffset + common, lfamilylength
- common, right, rfamilyoffset + common, rfamilylength - common);
}
// Compare family & qualifier together.
final int comparison = Bytes.compareTo(left, lfamilyoffset + common,
lcolumnlength - common, right, rfamilyoffset + common,
rcolumnlength - common);
if (comparison != 0) {
return comparison;
}
////
// Next compare timestamps.
long ltimestamp = Bytes.toLong(left,
loffset + (llength - TIMESTAMP_TYPE_SIZE));
long rtimestamp = Bytes.toLong(right,
roffset + (rlength - TIMESTAMP_TYPE_SIZE));
int compare = compareTimestamps(ltimestamp, rtimestamp);
if (compare != 0) {
return compare;
}
// Compare types. Let the delete types sort ahead of puts; i.e. types
// of higher numbers sort before those of lesser numbers. Maximum (255)
// appears ahead of everything, and minimum (0) appears after
// everything.
return (0xff & rtype) - (0xff & ltype);
}
protected int compareFamilies(final byte[] left, final int loffset, final int lfamilylength,
final byte[] right, final int roffset, final int rfamilylength) {
int diff = Bytes.compareTo(left, loffset, lfamilylength, right, roffset, rfamilylength);
return diff;
}
protected int compareColumns(final byte[] left, final int loffset, final int lquallength,
final byte[] right, final int roffset, final int rquallength) {
int diff = Bytes.compareTo(left, loffset, lquallength, right, roffset, rquallength);
return diff;
}
/**
* Compares the row and column of two keyvalues for equality
* @param left
* @param right
* @return True if same row and column.
*/
public boolean matchingRowColumn(final Cell left,
final Cell right) {
short lrowlength = left.getRowLength();
short rrowlength = right.getRowLength();
// TsOffset = end of column data. just comparing Row+CF length of each
if ((left.getRowLength() + left.getFamilyLength() + left.getQualifierLength()) != (right
.getRowLength() + right.getFamilyLength() + right.getQualifierLength())) {
return false;
}
if (!matchingRows(left, lrowlength, right, rrowlength)) {
return false;
}
int lfoffset = left.getFamilyOffset();
int rfoffset = right.getFamilyOffset();
int lclength = left.getQualifierLength();
int rclength = right.getQualifierLength();
int lfamilylength = left.getFamilyLength();
int rfamilylength = right.getFamilyLength();
int diff = compareFamilies(left.getFamilyArray(), lfoffset, lfamilylength,
right.getFamilyArray(), rfoffset, rfamilylength);
if (diff != 0) {
return false;
} else {
diff = compareColumns(left.getQualifierArray(), left.getQualifierOffset(), lclength,
right.getQualifierArray(), right.getQualifierOffset(), rclength);
return diff == 0;
}
}
/**
* Compares the row of two keyvalues for equality
* @param left
* @param right
* @return True if rows match.
*/
public boolean matchingRows(final Cell left, final Cell right) {
short lrowlength = left.getRowLength();
short rrowlength = right.getRowLength();
return matchingRows(left, lrowlength, right, rrowlength);
}
/**
* @param left
* @param lrowlength
* @param right
* @param rrowlength
* @return True if rows match.
*/
private boolean matchingRows(final Cell left, final short lrowlength,
final Cell right, final short rrowlength) {
return lrowlength == rrowlength &&
matchingRows(left.getRowArray(), left.getRowOffset(), lrowlength,
right.getRowArray(), right.getRowOffset(), rrowlength);
}
/**
* Compare rows. Just calls Bytes.equals, but it's good to have this encapsulated.
* @param left Left row array.
* @param loffset Left row offset.
* @param llength Left row length.
* @param right Right row array.
* @param roffset Right row offset.
* @param rlength Right row length.
* @return Whether rows are the same row.
*/
public boolean matchingRows(final byte [] left, final int loffset, final int llength,
final byte [] right, final int roffset, final int rlength) {
return Bytes.equals(left, loffset, llength, right, roffset, rlength);
}
public byte[] calcIndexKey(byte[] lastKeyOfPreviousBlock, byte[] firstKeyInBlock) {
byte[] fakeKey = getShortMidpointKey(lastKeyOfPreviousBlock, firstKeyInBlock);
if (compareFlatKey(fakeKey, firstKeyInBlock) > 0) {
LOG.error("Unexpected getShortMidpointKey result, fakeKey:"
+ Bytes.toStringBinary(fakeKey) + ", firstKeyInBlock:"
+ Bytes.toStringBinary(firstKeyInBlock));
return firstKeyInBlock;
}
if (lastKeyOfPreviousBlock != null && compareFlatKey(lastKeyOfPreviousBlock, fakeKey) >= 0) {
LOG.error("Unexpected getShortMidpointKey result, lastKeyOfPreviousBlock:" +
Bytes.toStringBinary(lastKeyOfPreviousBlock) + ", fakeKey:" +
Bytes.toStringBinary(fakeKey));
return firstKeyInBlock;
}
return fakeKey;
}
/**
* This is a HFile block index key optimization.
* @param leftKey
* @param rightKey
* @return 0 if equal, &lt;0 if left smaller, &gt;0 if right smaller
* @deprecated Since 0.99.2;
*/
@Deprecated
public byte[] getShortMidpointKey(final byte[] leftKey, final byte[] rightKey) {
if (rightKey == null) {
throw new IllegalArgumentException("rightKey can not be null");
}
if (leftKey == null) {
return Arrays.copyOf(rightKey, rightKey.length);
}
if (compareFlatKey(leftKey, rightKey) >= 0) {
throw new IllegalArgumentException("Unexpected input, leftKey:" + Bytes.toString(leftKey)
+ ", rightKey:" + Bytes.toString(rightKey));
}
short leftRowLength = Bytes.toShort(leftKey, 0);
short rightRowLength = Bytes.toShort(rightKey, 0);
int leftCommonLength = ROW_LENGTH_SIZE + FAMILY_LENGTH_SIZE + leftRowLength;
int rightCommonLength = ROW_LENGTH_SIZE + FAMILY_LENGTH_SIZE + rightRowLength;
int leftCommonLengthWithTSAndType = TIMESTAMP_TYPE_SIZE + leftCommonLength;
int rightCommonLengthWithTSAndType = TIMESTAMP_TYPE_SIZE + rightCommonLength;
int leftColumnLength = leftKey.length - leftCommonLengthWithTSAndType;
int rightColumnLength = rightKey.length - rightCommonLengthWithTSAndType;
// rows are equal
if (leftRowLength == rightRowLength && compareRows(leftKey, ROW_LENGTH_SIZE, leftRowLength,
rightKey, ROW_LENGTH_SIZE, rightRowLength) == 0) {
// Compare family & qualifier together.
int comparison = Bytes.compareTo(leftKey, leftCommonLength, leftColumnLength, rightKey,
rightCommonLength, rightColumnLength);
// same with "row + family + qualifier", return rightKey directly
if (comparison == 0) {
return Arrays.copyOf(rightKey, rightKey.length);
}
// "family + qualifier" are different, generate a faked key per rightKey
byte[] newKey = Arrays.copyOf(rightKey, rightKey.length);
Bytes.putLong(newKey, rightKey.length - TIMESTAMP_TYPE_SIZE, HConstants.LATEST_TIMESTAMP);
Bytes.putByte(newKey, rightKey.length - TYPE_SIZE, Type.Maximum.getCode());
return newKey;
}
// rows are different
short minLength = leftRowLength < rightRowLength ? leftRowLength : rightRowLength;
short diffIdx = 0;
while (diffIdx < minLength
&& leftKey[ROW_LENGTH_SIZE + diffIdx] == rightKey[ROW_LENGTH_SIZE + diffIdx]) {
diffIdx++;
}
byte[] newRowKey = null;
if (diffIdx >= minLength) {
// leftKey's row is prefix of rightKey's.
newRowKey = new byte[diffIdx + 1];
System.arraycopy(rightKey, ROW_LENGTH_SIZE, newRowKey, 0, diffIdx + 1);
} else {
int diffByte = leftKey[ROW_LENGTH_SIZE + diffIdx];
if ((0xff & diffByte) < 0xff && (diffByte + 1) <
(rightKey[ROW_LENGTH_SIZE + diffIdx] & 0xff)) {
newRowKey = new byte[diffIdx + 1];
System.arraycopy(leftKey, ROW_LENGTH_SIZE, newRowKey, 0, diffIdx);
newRowKey[diffIdx] = (byte) (diffByte + 1);
} else {
newRowKey = new byte[diffIdx + 1];
System.arraycopy(rightKey, ROW_LENGTH_SIZE, newRowKey, 0, diffIdx + 1);
}
}
return new KeyValue(newRowKey, null, null, HConstants.LATEST_TIMESTAMP,
Type.Maximum).getKey();
}
@Override
protected Object clone() throws CloneNotSupportedException {
super.clone();
return new KVComparator();
}
}
/**
* @param in Where to read bytes from. Creates a byte array to hold the KeyValue
* backing bytes copied from the steam.
* @return KeyValue created by deserializing from <code>in</code> OR if we find a length
* of zero, we will return null which can be useful marking a stream as done.
* @throws IOException
*/
public static KeyValue create(final DataInput in) throws IOException {
return create(in.readInt(), in);
}
/**
* Create a KeyValue reading <code>length</code> from <code>in</code>
* @param length
* @param in
* @return Created KeyValue OR if we find a length of zero, we will return null which
* can be useful marking a stream as done.
* @throws IOException
*/
public static KeyValue create(int length, final DataInput in) throws IOException {
if (length <= 0) {
if (length == 0) return null;
throw new IOException("Failed read " + length + " bytes, stream corrupt?");
}
// This is how the old Writables.readFrom used to deserialize. Didn't even vint.
byte [] bytes = new byte[length];
in.readFully(bytes);
return new KeyValue(bytes, 0, length);
}
/**
* Write out a KeyValue in the manner in which we used to when KeyValue was a Writable.
* @param kv
* @param out
* @return Length written on stream
* @throws IOException
* @see #create(DataInput) for the inverse function
*/
public static long write(final KeyValue kv, final DataOutput out) throws IOException {
// This is how the old Writables write used to serialize KVs. Need to figure way to make it
// work for all implementations.
int length = kv.getLength();
out.writeInt(length);
out.write(kv.getBuffer(), kv.getOffset(), length);
return (long) length + Bytes.SIZEOF_INT;
}
/**
* Write out a KeyValue in the manner in which we used to when KeyValue was a Writable but do
* not require a {@link DataOutput}, just take plain {@link OutputStream}
* Named <code>oswrite</code> so does not clash with {@link #write(KeyValue, DataOutput)}
* @param kv
* @param out
* @param withTags
* @return Length written on stream
* @throws IOException
* @see #create(DataInput) for the inverse function
* @see #write(KeyValue, DataOutput)
* @see KeyValueUtil#oswrite(Cell, OutputStream, boolean)
* @deprecated As of release 2.0.0, this will be removed in HBase 3.0.0.
* Instead use {@link #write(OutputStream, boolean)}
*/
@Deprecated
public static long oswrite(final KeyValue kv, final OutputStream out, final boolean withTags)
throws IOException {
ByteBufferUtils.putInt(out, kv.getSerializedSize(withTags));
return (long) kv.write(out, withTags) + Bytes.SIZEOF_INT;
}
@Override
public int write(OutputStream out, boolean withTags) throws IOException {
int len = getSerializedSize(withTags);
out.write(this.bytes, this.offset, len);
return len;
}
@Override
public int getSerializedSize(boolean withTags) {
if (withTags) {
return this.length;
}
return this.getKeyLength() + this.getValueLength() + KEYVALUE_INFRASTRUCTURE_SIZE;
}
@Override
public int getSerializedSize() {
return this.length;
}
@Override
public void write(ByteBuffer buf, int offset) {
ByteBufferUtils.copyFromArrayToBuffer(buf, offset, this.bytes, this.offset, this.length);
}
/**
* Avoids redundant comparisons for better performance.
*
* TODO get rid of this wart
*/
public interface SamePrefixComparator<T> {
/**
* Compare two keys assuming that the first n bytes are the same.
* @param commonPrefix How many bytes are the same.
*/
int compareIgnoringPrefix(int commonPrefix, byte[] left, int loffset, int llength,
byte[] right, int roffset, int rlength
);
}
/**
* HeapSize implementation
*
* We do not count the bytes in the rowCache because it should be empty for a KeyValue in the
* MemStore.
*/
@Override
public long heapSize() {
/*
* Deep object overhead for this KV consists of two parts. The first part is the KV object
* itself, while the second part is the backing byte[]. We will only count the array overhead
* from the byte[] only if this is the first KV in there.
*/
return ClassSize.align(FIXED_OVERHEAD) +
(offset == 0
? ClassSize.sizeOfByteArray(length) // count both length and object overhead
: length); // only count the number of bytes
}
/**
* A simple form of KeyValue that creates a keyvalue with only the key part of the byte[]
* Mainly used in places where we need to compare two cells. Avoids copying of bytes
* In places like block index keys, we need to compare the key byte[] with a cell.
* Hence create a Keyvalue(aka Cell) that would help in comparing as two cells
*/
public static class KeyOnlyKeyValue extends KeyValue {
private short rowLen = -1;
public KeyOnlyKeyValue() {
}
public KeyOnlyKeyValue(byte[] b) {
this(b, 0, b.length);
}
public KeyOnlyKeyValue(byte[] b, int offset, int length) {
this.bytes = b;
this.length = length;
this.offset = offset;
this.rowLen = Bytes.toShort(this.bytes, this.offset);
}
public void set(KeyOnlyKeyValue keyOnlyKeyValue) {
this.bytes = keyOnlyKeyValue.bytes;
this.length = keyOnlyKeyValue.length;
this.offset = keyOnlyKeyValue.offset;
this.rowLen = keyOnlyKeyValue.rowLen;
}
public void clear() {
rowLen = -1;
bytes = null;
offset = 0;
length = 0;
}
@Override
public int getKeyOffset() {
return this.offset;
}
/**
* A setter that helps to avoid object creation every time and whenever
* there is a need to create new KeyOnlyKeyValue.
* @param key
* @param offset
* @param length
*/
public void setKey(byte[] key, int offset, int length) {
this.bytes = key;
this.offset = offset;
this.length = length;
this.rowLen = Bytes.toShort(this.bytes, this.offset);
}
@Override
public byte[] getKey() {
int keylength = getKeyLength();
byte[] key = new byte[keylength];
System.arraycopy(this.bytes, getKeyOffset(), key, 0, keylength);
return key;
}
@Override
public byte[] getRowArray() {
return bytes;
}
@Override
public int getRowOffset() {
return getKeyOffset() + Bytes.SIZEOF_SHORT;
}
@Override
public byte[] getFamilyArray() {
return bytes;
}
@Override
public byte getFamilyLength() {
return this.bytes[getFamilyOffset() - 1];
}
@Override
public int getFamilyOffset() {
return this.offset + Bytes.SIZEOF_SHORT + getRowLength() + Bytes.SIZEOF_BYTE;
}
@Override
public byte[] getQualifierArray() {
return bytes;
}
@Override
public int getQualifierLength() {
return getQualifierLength(getRowLength(), getFamilyLength());
}
@Override
public int getQualifierOffset() {
return getFamilyOffset() + getFamilyLength();
}
@Override
public int getKeyLength() {
return length;
}
@Override
public short getRowLength() {
return rowLen;
}
@Override
public byte getTypeByte() {
return this.bytes[this.offset + getKeyLength() - 1];
}
private int getQualifierLength(int rlength, int flength) {
return getKeyLength() - (int) getKeyDataStructureSize(rlength, flength, 0);
}
@Override
public long getTimestamp() {
int tsOffset = getTimestampOffset();
return Bytes.toLong(this.bytes, tsOffset);
}
@Override
public int getTimestampOffset() {
return getKeyOffset() + getKeyLength() - TIMESTAMP_TYPE_SIZE;
}
@Override
public byte[] getTagsArray() {
return HConstants.EMPTY_BYTE_ARRAY;
}
@Override
public int getTagsOffset() {
return 0;
}
@Override
public byte[] getValueArray() {
throw new IllegalArgumentException("KeyOnlyKeyValue does not work with values.");
}
@Override
public int getValueOffset() {
throw new IllegalArgumentException("KeyOnlyKeyValue does not work with values.");
}
@Override
public int getValueLength() {
throw new IllegalArgumentException("KeyOnlyKeyValue does not work with values.");
}
@Override
public int getTagsLength() {
return 0;
}
@Override
public String toString() {
if (this.bytes == null || this.bytes.length == 0) {
return "empty";
}
return keyToString(this.bytes, this.offset, getKeyLength()) + "/vlen=0/mvcc=0";
}
@Override
public int hashCode() {
return super.hashCode();
}
@Override
public boolean equals(Object other) {
return super.equals(other);
}
@Override
public long heapSize() {
return super.heapSize() + Bytes.SIZEOF_SHORT;
}
@Override
public int write(OutputStream out, boolean withTags) throws IOException {
// This type of Cell is used only to maintain some internal states. We never allow this type
// of Cell to be returned back over the RPC
throw new IllegalStateException("A reader should never return this type of a Cell");
}
}
@Override
public ExtendedCell deepClone() {
byte[] copy = Bytes.copy(this.bytes, this.offset, this.length);
KeyValue kv = new KeyValue(copy, 0, copy.length);
kv.setSequenceId(this.getSequenceId());
return kv;
}
}