/**
* 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;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Comparator;
import com.google.common.primitives.Longs;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.io.HeapSize;
import org.apache.hadoop.hbase.io.hfile.HFile;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.ClassSize;
import org.apache.hadoop.io.RawComparator;
import org.apache.hadoop.io.Writable;
/**
* An HBase Key/Value.
*
* <p>If being used client-side, the primary methods to access individual fields
* are {@link #getRow()}, {@link #getFamily()}, {@link #getQualifier()},
* {@link #getTimestamp()}, and {@link #getValue()}. These methods allocate new
* byte arrays and return copies so they should be avoided server-side.
*
* <p>Instances of this class are immutable. They are not
* comparable but Comparators are provided. Comparators change with context,
* whether user table or a catalog table comparison context. Its
* important that you use the appropriate comparator comparing rows in
* particular. There are Comparators for KeyValue instances and then for
* just the Key portion of a KeyValue used mostly in {@link HFile}.
*
* <p>KeyValue wraps a byte array and has offset and length for passed array
* at where to start interpreting the content as a KeyValue blob. The KeyValue
* blob format inside the byte array is:
* <code><keylength> <valuelength> <key> <value></code>
* Key is decomposed as:
* <code><rowlength> <row> <columnfamilylength> <columnfamily> <columnqualifier> <timestamp> <keytype></code>
* Rowlength maximum is Short.MAX_SIZE, column family length maximum is
* Byte.MAX_SIZE, and column qualifier + key length must be < Integer.MAX_SIZE.
* The column does not contain the family/qualifier delimiter.
*
* <p>TODO: Group Key-only comparators and operations into a Key class, just
* for neatness sake, if can figure what to call it.
*/
public class KeyValue implements Writable, HeapSize {
static final Log LOG = LogFactory.getLog(KeyValue.class);
/**
* 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.
*/
public static KVComparator COMPARATOR = new KVComparator();
/**
* Comparator for plain key; i.e. non-catalog table key. Works on Key portion
* of KeyValue only.
*/
public static KeyComparator KEY_COMPARATOR = new KeyComparator();
/**
* A {@link KVComparator} for <code>.META.</code> catalog table
* {@link KeyValue}s.
*/
public static KVComparator META_COMPARATOR = new MetaComparator();
/**
* A {@link KVComparator} for <code>.META.</code> catalog table
* {@link KeyValue} keys.
*/
public static KeyComparator META_KEY_COMPARATOR = new MetaKeyComparator();
/**
* A {@link KVComparator} for <code>-ROOT-</code> catalog table
* {@link KeyValue}s.
*/
public static KVComparator ROOT_COMPARATOR = new RootComparator();
/**
* A {@link KVComparator} for <code>-ROOT-</code> catalog table
* {@link KeyValue} keys.
*/
public static KeyComparator ROOT_KEY_COMPARATOR = new RootKeyComparator();
/**
* Get the appropriate row comparator for the specified table.
*
* Hopefully we can get rid of this, I added this here because it's replacing
* something in HSK. We should move completely off of that.
*
* @param tableName The table name.
* @return The comparator.
*/
public static KeyComparator getRowComparator(byte [] tableName) {
if(Bytes.equals(HTableDescriptor.ROOT_TABLEDESC.getName(),tableName)) {
return ROOT_COMPARATOR.getRawComparator();
}
if(Bytes.equals(HTableDescriptor.META_TABLEDESC.getName(), tableName)) {
return META_COMPARATOR.getRawComparator();
}
return COMPARATOR.getRawComparator();
}
// Size of the timestamp and type byte on end of a key -- a long + a byte.
public static final int TIMESTAMP_TYPE_SIZE =
Bytes.SIZEOF_LONG /* timestamp */ +
Bytes.SIZEOF_BYTE /*keytype*/;
// Size of the length shorts and bytes in key.
public static final int KEY_INFRASTRUCTURE_SIZE =
Bytes.SIZEOF_SHORT /*rowlength*/ +
Bytes.SIZEOF_BYTE /*columnfamilylength*/ +
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*/;
// Size of the length ints in a KeyValue datastructure.
public static final int KEYVALUE_INFRASTRUCTURE_SIZE = ROW_OFFSET;
/**
* 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),
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;
}
/**
* 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) {
for (Type t : Type.values()) {
if (t.getCode() == b) {
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);
private byte [] bytes = null;
private int offset = 0;
private int length = 0;
// the row cached
private byte [] rowCache = null;
/** Here be dragons **/
// used to achieve atomic operations in the memstore.
public long getMemstoreTS() {
return memstoreTS;
}
public void setMemstoreTS(long memstoreTS) {
this.memstoreTS = memstoreTS;
}
// default value is 0, aka DNC
private long memstoreTS = 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) {
this.bytes = bytes;
this.offset = offset;
this.length = length;
}
/** 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, timestamp, Type.Maximum);
}
/**
* 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 filled with null value.
* @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 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, family, qualifier, 0, qualifier==null ? 0 : qualifier.length,
timestamp, type, value, 0, value==null ? 0 : value.length);
}
/**
* 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) {
this(row, 0, row==null ? 0 : row.length,
family, 0, family==null ? 0 : family.length,
qualifier, qoffset, qlength, timestamp, type,
value, voffset, vlength);
}
/**
* 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
* @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.bytes = createByteArray(row, roffset, rlength,
family, foffset, flength, qualifier, qoffset, qlength,
timestamp, type, value, voffset, vlength);
this.length = bytes.length;
this.offset = 0;
}
/**
* 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.
*/
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) {
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
qlength = qualifier == null ? 0 : qlength;
if (qlength > Integer.MAX_VALUE - rlength - flength) {
throw new IllegalArgumentException("Qualifier > " + Integer.MAX_VALUE);
}
// Key length
long longkeylength = KEY_INFRASTRUCTURE_SIZE + rlength + flength + qlength;
if (longkeylength > Integer.MAX_VALUE) {
throw new IllegalArgumentException("keylength " + longkeylength + " > " +
Integer.MAX_VALUE);
}
int keylength = (int)longkeylength;
// Value length
vlength = value == null? 0 : vlength;
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[KEYVALUE_INFRASTRUCTURE_SIZE + keylength + vlength];
// 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);
}
return bytes;
}
/**
* Write KeyValue format into a byte array.
* <p>
* Takes column in the form <code>family:qualifier</code>
* @param row - row key (arbitrary byte array)
* @param roffset
* @param rlength
* @param column
* @param coffset
* @param clength
* @param timestamp
* @param type
* @param value
* @param voffset
* @param vlength
* @return The newly created byte array.
*/
static byte [] createByteArray(final byte [] row, final int roffset,
final int rlength,
final byte [] column, final int coffset, int clength,
final long timestamp, final Type type,
final byte [] value, final int voffset, int vlength) {
// If column is non-null, figure where the delimiter is at.
int delimiteroffset = 0;
if (column != null && column.length > 0) {
delimiteroffset = getFamilyDelimiterIndex(column, coffset, clength);
if (delimiteroffset > Byte.MAX_VALUE) {
throw new IllegalArgumentException("Family > " + Byte.MAX_VALUE);
}
} else {
return createByteArray(row,roffset,rlength,null,0,0,null,0,0,timestamp,
type,value,voffset,vlength);
}
int flength = delimiteroffset-coffset;
int qlength = clength - flength - 1;
return createByteArray(row, roffset, rlength, column, coffset,
flength, column, delimiteroffset+1, qlength, timestamp, type,
value, voffset, vlength);
}
// Needed doing 'contains' on List. Only compares the key portion, not the
// value.
public boolean equals(Object other) {
if (!(other instanceof KeyValue)) {
return false;
}
KeyValue kv = (KeyValue)other;
// Comparing bytes should be fine doing equals test. Shouldn't have to
// worry about special .META. comparators doing straight equals.
boolean result = Bytes.BYTES_RAWCOMPARATOR.compare(getBuffer(),
getKeyOffset(), getKeyLength(),
kv.getBuffer(), kv.getKeyOffset(), kv.getKeyLength()) == 0;
return result;
}
public int hashCode() {
byte[] b = getBuffer();
int start = getOffset(), end = getOffset() + getLength();
int h = b[start++];
for (int i = start; i < end; i++) {
h = (h * 13) ^ b[i];
}
return h;
}
//---------------------------------------------------------------------------
//
// KeyValue cloning
//
//---------------------------------------------------------------------------
/**
* Clones a KeyValue. This creates a copy, re-allocating the buffer.
* @return Fully copied clone of this KeyValue
*/
public KeyValue 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.setMemstoreTS(memstoreTS);
return ret;
}
//---------------------------------------------------------------------------
//
// String representation
//
//---------------------------------------------------------------------------
public String toString() {
if (this.bytes == null || this.bytes.length == 0) {
return "empty";
}
return keyToString(this.bytes, this.offset + ROW_OFFSET, getKeyLength()) +
"/vlen=" + getValueLength();
}
/**
* @param k Key portion of a KeyValue.
* @return Key as a String.
*/
public static String keyToString(final byte [] k) {
return keyToString(k, 0, k.length);
}
/**
* 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));
byte type = b[o + l - 1];
// return row + "/" + family +
// (family != null && family.length() > 0? COLUMN_FAMILY_DELIMITER: "") +
// qualifier + "/" + timestamp + "/" + Type.codeToType(type);
return row + "/" + family +
(family != null && family.length() > 0? ":" :"") +
qualifier + "/" + timestamp + "/" + Type.codeToType(type);
}
//---------------------------------------------------------------------------
//
// Public Member Accessors
//
//---------------------------------------------------------------------------
/**
* @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) {
return (2 * Bytes.SIZEOF_INT) +
Bytes.toInt(bytes, offset) +
Bytes.toInt(bytes, offset + Bytes.SIZEOF_INT);
}
/**
* @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.
*/
private int keyLength = 0;
public int getKeyLength() {
if (keyLength == 0) {
keyLength = Bytes.toInt(this.bytes, this.offset);
}
return keyLength;
}
/**
* @return Value offset
*/
public int getValueOffset() {
return getKeyOffset() + getKeyLength();
}
/**
* @return Value length
*/
public int getValueLength() {
return Bytes.toInt(this.bytes, this.offset + Bytes.SIZEOF_INT);
}
/**
* @return Row offset
*/
public int getRowOffset() {
return getKeyOffset() + Bytes.SIZEOF_SHORT;
}
/**
* @return Row length
*/
public short getRowLength() {
return Bytes.toShort(this.bytes, getKeyOffset());
}
/**
* @return Family offset
*/
public int getFamilyOffset() {
return getFamilyOffset(getRowLength());
}
/**
* @return Family offset
*/
public int getFamilyOffset(int rlength) {
return this.offset + ROW_OFFSET + Bytes.SIZEOF_SHORT + rlength + Bytes.SIZEOF_BYTE;
}
/**
* @return Family length
*/
public byte getFamilyLength() {
return getFamilyLength(getFamilyOffset());
}
/**
* @return Family length
*/
public byte getFamilyLength(int foffset) {
return this.bytes[foffset-1];
}
/**
* @return Qualifier offset
*/
public int getQualifierOffset() {
return getQualifierOffset(getFamilyOffset());
}
/**
* @return Qualifier offset
*/
public int getQualifierOffset(int foffset) {
return foffset + getFamilyLength(foffset);
}
/**
* @return Qualifier length
*/
public int getQualifierLength() {
return getQualifierLength(getRowLength(),getFamilyLength());
}
/**
* @return Qualifier length
*/
public int getQualifierLength(int rlength, int flength) {
return getKeyLength() -
(KEY_INFRASTRUCTURE_SIZE + rlength + flength);
}
/**
* @return Column (family + qualifier) length
*/
public int getTotalColumnLength() {
int rlength = getRowLength();
int foffset = getFamilyOffset(rlength);
return getTotalColumnLength(rlength,foffset);
}
/**
* @return Column (family + qualifier) length
*/
public int getTotalColumnLength(int rlength, int foffset) {
int flength = getFamilyLength(foffset);
int qlength = getQualifierLength(rlength,flength);
return flength + qlength;
}
/**
* @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
*/
public 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.compareTo(getBuffer(), getTimestampOffset(), Bytes.SIZEOF_LONG,
HConstants.LATEST_TIMESTAMP_BYTES, 0, Bytes.SIZEOF_LONG) == 0;
}
/**
* @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);
return true;
}
return false;
}
//---------------------------------------------------------------------------
//
// Methods that return copies of fields
//
//---------------------------------------------------------------------------
/**
* Do not use unless you have to. Used internally for compacting and testing.
*
* Use {@link #getRow()}, {@link #getFamily()}, {@link #getQualifier()}, and
* {@link #getValue()} 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;
}
/**
* Returns value in a new byte array.
* Primarily for use client-side. If server-side, use
* {@link #getBuffer()} with appropriate offsets and lengths instead to
* save on allocations.
* @return Value in a new byte array.
*/
public byte [] getValue() {
int o = getValueOffset();
int l = getValueLength();
byte [] result = new byte[l];
System.arraycopy(getBuffer(), o, result, 0, l);
return result;
}
/**
* Primarily for use client-side. Returns the row of this KeyValue in a new
* byte array.<p>
*
* If server-side, use {@link #getBuffer()} with appropriate offsets and
* lengths instead.
* @return Row in a new byte array.
*/
public byte [] getRow() {
if (rowCache == null) {
int o = getRowOffset();
short l = getRowLength();
rowCache = new byte[l];
System.arraycopy(getBuffer(), o, rowCache, 0, l);
}
return rowCache;
}
/**
*
* @return Timestamp
*/
private long timestampCache = -1;
public long getTimestamp() {
if (timestampCache == -1) {
timestampCache = getTimestamp(getKeyLength());
}
return timestampCache;
}
/**
* @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 Type of this KeyValue.
*/
public byte getType() {
return getType(getKeyLength());
}
/**
* @param keylength Pass if you have it to save on a int creation.
* @return Type of this KeyValue.
*/
byte getType(final int keylength) {
return this.bytes[this.offset + keylength - 1 + ROW_OFFSET];
}
/**
* @return True if a delete type, a {@link KeyValue.Type#Delete} or
* a {KeyValue.Type#DeleteFamily} or a {@link KeyValue.Type#DeleteColumn}
* KeyValue type.
*/
public boolean isDelete() {
int t = getType();
return Type.Delete.getCode() <= t && t <= Type.DeleteFamily.getCode();
}
/**
* @return True if this KV is a {@link KeyValue.Type#Delete} type.
*/
public boolean isDeleteType() {
return getType() == Type.Delete.getCode();
}
/**
* @return True if this KV is a delete family type.
*/
public boolean isDeleteFamily() {
return getType() == Type.DeleteFamily.getCode();
}
/**
*
* @return True if this KV is a delete family or column type.
*/
public boolean isDeleteColumnOrFamily() {
int t = getType();
return t == Type.DeleteColumn.getCode() || t == Type.DeleteFamily.getCode();
}
/**
* Primarily for use client-side. Returns the family of this KeyValue in a
* new byte array.<p>
*
* If server-side, use {@link #getBuffer()} with appropriate offsets and
* lengths instead.
* @return Returns family. Makes a copy.
*/
public byte [] getFamily() {
int o = getFamilyOffset();
int l = getFamilyLength(o);
byte [] result = new byte[l];
System.arraycopy(this.bytes, o, result, 0, l);
return result;
}
/**
* Primarily for use client-side. Returns the column qualifier of this
* KeyValue in a new byte array.<p>
*
* If server-side, use {@link #getBuffer()} with appropriate offsets and
* lengths instead.
* Use {@link #getBuffer()} with appropriate offsets and lengths instead.
* @return Returns qualifier. Makes a copy.
*/
public byte [] getQualifier() {
int o = getQualifierOffset();
int l = getQualifierLength();
byte [] result = new byte[l];
System.arraycopy(this.bytes, o, result, 0, l);
return result;
}
//---------------------------------------------------------------------------
//
// KeyValue splitter
//
//---------------------------------------------------------------------------
/**
* Utility class that splits a KeyValue buffer into separate byte arrays.
* <p>
* Should get rid of this if we can, but is very useful for debugging.
*/
public static class SplitKeyValue {
private byte [][] split;
SplitKeyValue() {
this.split = new byte[6][];
}
public void setRow(byte [] value) { this.split[0] = value; }
public void setFamily(byte [] value) { this.split[1] = value; }
public void setQualifier(byte [] value) { this.split[2] = value; }
public void setTimestamp(byte [] value) { this.split[3] = value; }
public void setType(byte [] value) { this.split[4] = value; }
public void setValue(byte [] value) { this.split[5] = value; }
public byte [] getRow() { return this.split[0]; }
public byte [] getFamily() { return this.split[1]; }
public byte [] getQualifier() { return this.split[2]; }
public byte [] getTimestamp() { return this.split[3]; }
public byte [] getType() { return this.split[4]; }
public byte [] getValue() { return this.split[5]; }
}
public SplitKeyValue split() {
SplitKeyValue split = new SplitKeyValue();
int splitOffset = this.offset;
int keyLen = Bytes.toInt(bytes, splitOffset);
splitOffset += Bytes.SIZEOF_INT;
int valLen = Bytes.toInt(bytes, splitOffset);
splitOffset += Bytes.SIZEOF_INT;
short rowLen = Bytes.toShort(bytes, splitOffset);
splitOffset += Bytes.SIZEOF_SHORT;
byte [] row = new byte[rowLen];
System.arraycopy(bytes, splitOffset, row, 0, rowLen);
splitOffset += rowLen;
split.setRow(row);
byte famLen = bytes[splitOffset];
splitOffset += Bytes.SIZEOF_BYTE;
byte [] family = new byte[famLen];
System.arraycopy(bytes, splitOffset, family, 0, famLen);
splitOffset += famLen;
split.setFamily(family);
int colLen = keyLen -
(rowLen + famLen + Bytes.SIZEOF_SHORT + Bytes.SIZEOF_BYTE +
Bytes.SIZEOF_LONG + Bytes.SIZEOF_BYTE);
byte [] qualifier = new byte[colLen];
System.arraycopy(bytes, splitOffset, qualifier, 0, colLen);
splitOffset += colLen;
split.setQualifier(qualifier);
byte [] timestamp = new byte[Bytes.SIZEOF_LONG];
System.arraycopy(bytes, splitOffset, timestamp, 0, Bytes.SIZEOF_LONG);
splitOffset += Bytes.SIZEOF_LONG;
split.setTimestamp(timestamp);
byte [] type = new byte[1];
type[0] = bytes[splitOffset];
splitOffset += Bytes.SIZEOF_BYTE;
split.setType(type);
byte [] value = new byte[valLen];
System.arraycopy(bytes, splitOffset, value, 0, valLen);
split.setValue(value);
return split;
}
//---------------------------------------------------------------------------
//
// Compare specified fields against those contained in this KeyValue
//
//---------------------------------------------------------------------------
/**
* @param family
* @return True if matching families.
*/
public boolean matchingFamily(final byte [] family) {
return matchingFamily(family, 0, family.length);
}
public boolean matchingFamily(final byte[] family, int offset, int length) {
if (this.length == 0 || this.bytes.length == 0) {
return false;
}
return Bytes.compareTo(family, offset, length,
this.bytes, getFamilyOffset(), getFamilyLength()) == 0;
}
public boolean matchingFamily(final KeyValue other) {
return matchingFamily(other.getBuffer(), other.getFamilyOffset(),
other.getFamilyLength());
}
/**
* @param qualifier
* @return True if matching qualifiers.
*/
public boolean matchingQualifier(final byte [] qualifier) {
return matchingQualifier(qualifier, 0, qualifier.length);
}
public boolean matchingQualifier(final byte [] qualifier, int offset, int length) {
return Bytes.compareTo(qualifier, offset, length,
this.bytes, getQualifierOffset(), getQualifierLength()) == 0;
}
public boolean matchingQualifier(final KeyValue other) {
return matchingQualifier(other.getBuffer(), other.getQualifierOffset(),
other.getQualifierLength());
}
public boolean matchingRow(final byte [] row) {
return matchingRow(row, 0, row.length);
}
public boolean matchingRow(final byte[] row, int offset, int length) {
return Bytes.compareTo(row, offset, length,
this.bytes, getRowOffset(), getRowLength()) == 0;
}
public boolean matchingRow(KeyValue other) {
return matchingRow(other.getBuffer(), other.getRowOffset(),
other.getRowLength());
}
/**
* @param column Column minus its delimiter
* @return True if column matches.
*/
public boolean matchingColumnNoDelimiter(final byte [] column) {
int rl = getRowLength();
int o = getFamilyOffset(rl);
int fl = getFamilyLength(o);
int l = fl + getQualifierLength(rl,fl);
return Bytes.compareTo(column, 0, column.length, this.bytes, o, l) == 0;
}
/**
*
* @param family column family
* @param qualifier column qualifier
* @return True if column matches
*/
public boolean matchingColumn(final byte[] family, final byte[] qualifier) {
int rl = getRowLength();
int o = getFamilyOffset(rl);
int fl = getFamilyLength(o);
int ql = getQualifierLength(rl,fl);
if (Bytes.compareTo(family, 0, family.length, this.bytes, o, family.length)
!= 0) {
return false;
}
if (qualifier == null || qualifier.length == 0) {
if (ql == 0) {
return true;
}
return false;
}
return Bytes.compareTo(qualifier, 0, qualifier.length,
this.bytes, o + fl, ql) == 0;
}
/**
* @param left
* @param loffset
* @param llength
* @param lfamilylength Offset of family delimiter in left column.
* @param right
* @param roffset
* @param rlength
* @param rfamilylength Offset of family delimiter in right column.
* @return The result of the comparison.
*/
static int compareColumns(final byte [] left, final int loffset,
final int llength, final int lfamilylength,
final byte [] right, final int roffset, final 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);
}
/**
* @return True if non-null row and column.
*/
public boolean nonNullRowAndColumn() {
return getRowLength() > 0 && !isEmptyColumn();
}
/**
* @return True if column is empty.
*/
public boolean isEmptyColumn() {
return getQualifierLength() == 0;
}
/**
* Converts this KeyValue to only contain the key portion (the value is
* changed to be null). This method does a full copy of the backing byte
* array and does not modify the original byte array of this KeyValue.
* <p>
* This method is used by <code>KeyOnlyFilter</code> and is an advanced feature of
* KeyValue, proceed with caution.
* @param lenAsVal replace value with the actual value length (false=empty)
*/
public void convertToKeyOnly(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() + (2 * Bytes.SIZEOF_INT) + 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());
}
this.bytes = newBuffer;
this.offset = 0;
this.length = newBuffer.length;
}
/**
* Splits a column in family:qualifier form into separate byte arrays.
* <p>
* Not recommend to be used as this is old-style API.
* @param c The column.
* @return The parsed column.
*/
public static byte [][] parseColumn(byte [] c) {
final int index = getDelimiter(c, 0, c.length, COLUMN_FAMILY_DELIMITER);
if (index == -1) {
// If no delimiter, return array of size 1
return new byte [][] { c };
} else if(index == c.length - 1) {
// Only a family, return array size 1
byte [] family = new byte[c.length-1];
System.arraycopy(c, 0, family, 0, family.length);
return new byte [][] { family };
}
// Family and column, return array size 2
final byte [][] result = new byte [2][];
result[0] = new byte [index];
System.arraycopy(c, 0, result[0], 0, index);
final int len = c.length - (index + 1);
result[1] = new byte[len];
System.arraycopy(c, index + 1 /*Skip delimiter*/, result[1], 0,
len);
return result;
}
/**
* Makes a column in family:qualifier form from separate byte arrays.
* <p>
* Not recommended for usage as this is old-style API.
* @param family
* @param qualifier
* @return family:qualifier
*/
public static byte [] makeColumn(byte [] family, byte [] qualifier) {
return Bytes.add(family, COLUMN_FAMILY_DELIM_ARRAY, qualifier);
}
/**
* @param b
* @return Index of the family-qualifier colon delimiter character in passed
* buffer.
*/
public static int getFamilyDelimiterIndex(final byte [] b, final int offset,
final int length) {
return getRequiredDelimiter(b, offset, length, COLUMN_FAMILY_DELIMITER);
}
private static int getRequiredDelimiter(final byte [] b,
final int offset, final int length, final int delimiter) {
int index = getDelimiter(b, offset, length, delimiter);
if (index < 0) {
throw new IllegalArgumentException("No " + (char)delimiter + " in <" +
Bytes.toString(b) + ">" + ", length=" + length + ", offset=" + offset);
}
return index;
}
static int getRequiredDelimiterInReverse(final byte [] b,
final int offset, final int length, final int delimiter) {
int index = getDelimiterInReverse(b, offset, length, delimiter);
if (index < 0) {
throw new IllegalArgumentException("No " + delimiter + " in <" +
Bytes.toString(b) + ">" + ", length=" + length + ", offset=" + offset);
}
return index;
}
/**
* @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 NullPointerException();
}
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 NullPointerException();
}
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>-ROOT-</code> catalog table
* {@link KeyValue}s.
*/
public static class RootComparator extends MetaComparator {
private final KeyComparator rawcomparator = new RootKeyComparator();
public KeyComparator getRawComparator() {
return this.rawcomparator;
}
@Override
protected Object clone() throws CloneNotSupportedException {
return new RootComparator();
}
}
/**
* A {@link KVComparator} for <code>.META.</code> catalog table
* {@link KeyValue}s.
*/
public static class MetaComparator extends KVComparator {
private final KeyComparator rawcomparator = new MetaKeyComparator();
public KeyComparator getRawComparator() {
return this.rawcomparator;
}
@Override
protected Object clone() throws CloneNotSupportedException {
return new MetaComparator();
}
}
/**
* 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.
* Hosts a {@link KeyComparator}.
*/
public static class KVComparator implements java.util.Comparator<KeyValue> {
private final KeyComparator rawcomparator = new KeyComparator();
/**
* @return RawComparator that can compare the Key portion of a KeyValue.
* Used in hfile where indices are the Key portion of a KeyValue.
*/
public KeyComparator getRawComparator() {
return this.rawcomparator;
}
public int compare(final KeyValue left, final KeyValue right) {
int ret = getRawComparator().compare(left.getBuffer(),
left.getOffset() + ROW_OFFSET, left.getKeyLength(),
right.getBuffer(), right.getOffset() + ROW_OFFSET,
right.getKeyLength());
if (ret != 0) return ret;
// Negate this comparison so later edits show up first
return -Longs.compare(left.getMemstoreTS(), right.getMemstoreTS());
}
public int compareTimestamps(final KeyValue left, final KeyValue right) {
return compareTimestamps(left, left.getKeyLength(), right,
right.getKeyLength());
}
int compareTimestamps(final KeyValue left, final int lkeylength,
final KeyValue right, final int rkeylength) {
// Compare timestamps
long ltimestamp = left.getTimestamp(lkeylength);
long rtimestamp = right.getTimestamp(rkeylength);
return getRawComparator().compareTimestamps(ltimestamp, rtimestamp);
}
/**
* @param left
* @param right
* @return Result comparing rows.
*/
public int compareRows(final KeyValue left, final KeyValue right) {
return compareRows(left, left.getRowLength(), right,
right.getRowLength());
}
/**
* @param left
* @param lrowlength Length of left row.
* @param right
* @param rrowlength Length of right row.
* @return Result comparing rows.
*/
public int compareRows(final KeyValue left, final short lrowlength,
final KeyValue right, final short rrowlength) {
return getRawComparator().compareRows(left.getBuffer(),
left.getRowOffset(), lrowlength,
right.getBuffer(), right.getRowOffset(), rrowlength);
}
/**
* @param left
* @param row - row key (arbitrary byte array)
* @return RawComparator
*/
public int compareRows(final KeyValue left, final byte [] row) {
return getRawComparator().compareRows(left.getBuffer(),
left.getRowOffset(), left.getRowLength(), row, 0, row.length);
}
public int compareRows(byte [] left, int loffset, int llength,
byte [] right, int roffset, int rlength) {
return getRawComparator().compareRows(left, loffset, llength,
right, roffset, rlength);
}
public int compareColumns(final KeyValue left, final byte [] right,
final int roffset, final int rlength, final int rfamilyoffset) {
int offset = left.getFamilyOffset();
int length = left.getFamilyLength() + left.getQualifierLength();
return getRawComparator().compareColumns(left.getBuffer(), offset, length,
left.getFamilyLength(offset),
right, roffset, rlength, rfamilyoffset);
}
int compareColumns(final KeyValue left, final short lrowlength,
final KeyValue right, final short rrowlength) {
int lfoffset = left.getFamilyOffset(lrowlength);
int rfoffset = right.getFamilyOffset(rrowlength);
int lclength = left.getTotalColumnLength(lrowlength,lfoffset);
int rclength = right.getTotalColumnLength(rrowlength, rfoffset);
int lfamilylength = left.getFamilyLength(lfoffset);
int rfamilylength = right.getFamilyLength(rfoffset);
return getRawComparator().compareColumns(left.getBuffer(), lfoffset,
lclength, lfamilylength,
right.getBuffer(), rfoffset, rclength, rfamilylength);
}
/**
* 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 KeyValue left,
final KeyValue right) {
short lrowlength = left.getRowLength();
short rrowlength = right.getRowLength();
// TsOffset = end of column data. just comparing Row+CF length of each
return left.getTimestampOffset() == right.getTimestampOffset() &&
matchingRows(left, lrowlength, right, rrowlength) &&
compareColumns(left, lrowlength, right, rrowlength) == 0;
}
/**
* @param left
* @param right
* @return True if rows match.
*/
public boolean matchingRows(final KeyValue left, final byte [] right) {
return compareRows(left, right) == 0;
}
/**
* Compares the row of two keyvalues for equality
* @param left
* @param right
* @return True if rows match.
*/
public boolean matchingRows(final KeyValue left, final KeyValue 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.
*/
public boolean matchingRows(final KeyValue left, final short lrowlength,
final KeyValue right, final short rrowlength) {
return lrowlength == rrowlength &&
compareRows(left, lrowlength, right, rrowlength) == 0;
}
public boolean matchingRows(final byte [] left, final int loffset,
final int llength,
final byte [] right, final int roffset, final int rlength) {
int compare = compareRows(left, loffset, llength,
right, roffset, rlength);
if (compare != 0) {
return false;
}
return true;
}
/**
* Compares the row and timestamp of two keys
* Was called matchesWithoutColumn in HStoreKey.
* @param right Key to compare against.
* @return True if same row and timestamp is greater than the timestamp in
* <code>right</code>
*/
public boolean matchingRowsGreaterTimestamp(final KeyValue left,
final KeyValue right) {
short lrowlength = left.getRowLength();
short rrowlength = right.getRowLength();
if (!matchingRows(left, lrowlength, right, rrowlength)) {
return false;
}
return left.getTimestamp() >= right.getTimestamp();
}
@Override
protected Object clone() throws CloneNotSupportedException {
return new KVComparator();
}
/**
* @return Comparator that ignores timestamps; useful counting versions.
*/
public KVComparator getComparatorIgnoringTimestamps() {
KVComparator c = null;
try {
c = (KVComparator)this.clone();
c.getRawComparator().ignoreTimestamp = true;
} catch (CloneNotSupportedException e) {
LOG.error("Not supported", e);
}
return c;
}
/**
* @return Comparator that ignores key type; useful checking deletes
*/
public KVComparator getComparatorIgnoringType() {
KVComparator c = null;
try {
c = (KVComparator)this.clone();
c.getRawComparator().ignoreType = true;
} catch (CloneNotSupportedException e) {
LOG.error("Not supported", e);
}
return c;
}
}
/**
* Creates a KeyValue that is last on the specified row id. That is,
* every other possible KeyValue for the given row would compareTo()
* less than the result of this call.
* @param row row key
* @return Last possible KeyValue on passed <code>row</code>
*/
public static KeyValue createLastOnRow(final byte[] row) {
return new KeyValue(row, null, null, HConstants.LATEST_TIMESTAMP, Type.Minimum);
}
/**
* Create a KeyValue that is smaller than all other possible KeyValues
* for the given row. That is any (valid) KeyValue on 'row' would sort
* _after_ the result.
*
* @param row - row key (arbitrary byte array)
* @return First possible KeyValue on passed <code>row</code>
*/
public static KeyValue createFirstOnRow(final byte [] row) {
return createFirstOnRow(row, HConstants.LATEST_TIMESTAMP);
}
/**
* Creates a KeyValue that is smaller than all other KeyValues that
* are older than the passed timestamp.
* @param row - row key (arbitrary byte array)
* @param ts - timestamp
* @return First possible key on passed <code>row</code> and timestamp.
*/
public static KeyValue createFirstOnRow(final byte [] row,
final long ts) {
return new KeyValue(row, null, null, ts, Type.Maximum);
}
/**
* @param row - row key (arbitrary byte array)
* @param c column - {@link #parseColumn(byte[])} is called to split
* the column.
* @param ts - timestamp
* @return First possible key on passed <code>row</code>, column and timestamp
* @deprecated
*/
public static KeyValue createFirstOnRow(final byte [] row, final byte [] c,
final long ts) {
byte [][] split = parseColumn(c);
return new KeyValue(row, split[0], split[1], ts, Type.Maximum);
}
/**
* Create a KeyValue for the specified row, family and qualifier that would be
* smaller than all other possible KeyValues that have the same row,family,qualifier.
* Used for seeking.
* @param row - row key (arbitrary byte array)
* @param family - family name
* @param qualifier - column qualifier
* @return First possible key on passed <code>row</code>, and column.
*/
public static KeyValue createFirstOnRow(final byte [] row, final byte [] family,
final byte [] qualifier) {
return new KeyValue(row, family, qualifier, HConstants.LATEST_TIMESTAMP, Type.Maximum);
}
/**
* @param row - row key (arbitrary byte array)
* @param f - family name
* @param q - column qualifier
* @param ts - timestamp
* @return First possible key on passed <code>row</code>, column and timestamp
*/
public static KeyValue createFirstOnRow(final byte [] row, final byte [] f,
final byte [] q, final long ts) {
return new KeyValue(row, f, q, ts, Type.Maximum);
}
/**
* Create a KeyValue for the specified row, family and qualifier that would be
* smaller than all other possible KeyValues that have the same row,
* family, qualifier.
* Used for seeking.
* @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
* @return First possible key on passed Row, Family, Qualifier.
*/
public static KeyValue createFirstOnRow(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) {
return new KeyValue(row, roffset, rlength, family,
foffset, flength, qualifier, qoffset, qlength,
HConstants.LATEST_TIMESTAMP, Type.Maximum, null, 0, 0);
}
/**
* Create a KeyValue for the specified row, family and qualifier that would be
* larger than or equal to all other possible KeyValues that have the same
* row, family, qualifier.
* Used for reseeking.
* @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
* @return Last possible key on passed row, family, qualifier.
*/
public static KeyValue createLastOnRow(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) {
return new KeyValue(row, roffset, rlength, family,
foffset, flength, qualifier, qoffset, qlength,
HConstants.OLDEST_TIMESTAMP, Type.Minimum, null, 0, 0);
}
/**
* @param b
* @return A KeyValue made of a byte array that holds the key-only part.
* Needed to convert hfile index members to KeyValues.
*/
public static KeyValue createKeyValueFromKey(final byte [] b) {
return createKeyValueFromKey(b, 0, b.length);
}
/**
* @param bb
* @return A KeyValue made of a byte buffer that holds the key-only part.
* Needed to convert hfile index members to KeyValues.
*/
public static KeyValue createKeyValueFromKey(final ByteBuffer bb) {
return createKeyValueFromKey(bb.array(), bb.arrayOffset(), bb.limit());
}
/**
* @param b
* @param o
* @param l
* @return A KeyValue made of a byte array that holds the key-only part.
* Needed to convert hfile index members to KeyValues.
*/
public static KeyValue createKeyValueFromKey(final byte [] b, final int o,
final int l) {
byte [] newb = new byte[b.length + ROW_OFFSET];
System.arraycopy(b, o, newb, ROW_OFFSET, l);
Bytes.putInt(newb, 0, b.length);
Bytes.putInt(newb, Bytes.SIZEOF_INT, 0);
return new KeyValue(newb);
}
/**
* Compare key portion of a {@link KeyValue} for keys in <code>-ROOT-<code>
* table.
*/
public static class RootKeyComparator extends MetaKeyComparator {
public int compareRows(byte [] left, int loffset, int llength,
byte [] right, int roffset, int rlength) {
// Rows look like this: .META.,ROW_FROM_META,RID
// LOG.info("ROOT " + Bytes.toString(left, loffset, llength) +
// "---" + Bytes.toString(right, roffset, rlength));
final int metalength = 7; // '.META.' length
int lmetaOffsetPlusDelimiter = loffset + metalength;
int leftFarDelimiter = getDelimiterInReverse(left,
lmetaOffsetPlusDelimiter,
llength - metalength, HRegionInfo.DELIMITER);
int rmetaOffsetPlusDelimiter = roffset + metalength;
int rightFarDelimiter = getDelimiterInReverse(right,
rmetaOffsetPlusDelimiter, rlength - metalength,
HRegionInfo.DELIMITER);
if (leftFarDelimiter < 0 && rightFarDelimiter >= 0) {
// Nothing between .META. and regionid. Its first key.
return -1;
} else if (rightFarDelimiter < 0 && leftFarDelimiter >= 0) {
return 1;
} else if (leftFarDelimiter < 0 && rightFarDelimiter < 0) {
return 0;
}
int result = super.compareRows(left, lmetaOffsetPlusDelimiter,
leftFarDelimiter - lmetaOffsetPlusDelimiter,
right, rmetaOffsetPlusDelimiter,
rightFarDelimiter - rmetaOffsetPlusDelimiter);
if (result != 0) {
return result;
}
// Compare last part of row, the rowid.
leftFarDelimiter++;
rightFarDelimiter++;
result = compareRowid(left, leftFarDelimiter,
llength - (leftFarDelimiter - loffset),
right, rightFarDelimiter, rlength - (rightFarDelimiter - roffset));
return result;
}
}
/**
* Comparator that compares row component only of a KeyValue.
*/
public static class RowComparator implements Comparator<KeyValue> {
final KVComparator comparator;
public RowComparator(final KVComparator c) {
this.comparator = c;
}
public int compare(KeyValue left, KeyValue right) {
return comparator.compareRows(left, right);
}
}
/**
* Compare key portion of a {@link KeyValue} for keys in <code>.META.</code>
* table.
*/
public static class MetaKeyComparator extends KeyComparator {
public int compareRows(byte [] left, int loffset, int llength,
byte [] right, int roffset, int rlength) {
// LOG.info("META " + Bytes.toString(left, loffset, llength) +
// "---" + Bytes.toString(right, roffset, rlength));
int leftDelimiter = getDelimiter(left, loffset, llength,
HRegionInfo.DELIMITER);
int rightDelimiter = getDelimiter(right, roffset, rlength,
HRegionInfo.DELIMITER);
if (leftDelimiter < 0 && rightDelimiter >= 0) {
// Nothing between .META. and regionid. Its first key.
return -1;
} else if (rightDelimiter < 0 && leftDelimiter >= 0) {
return 1;
} else if (leftDelimiter < 0 && rightDelimiter < 0) {
return 0;
}
// Compare up to the delimiter
int result = Bytes.compareTo(left, loffset, leftDelimiter - loffset,
right, roffset, rightDelimiter - roffset);
if (result != 0) {
return result;
}
// Compare middle bit of the row.
// Move past delimiter
leftDelimiter++;
rightDelimiter++;
int leftFarDelimiter = getRequiredDelimiterInReverse(left, leftDelimiter,
llength - (leftDelimiter - loffset), HRegionInfo.DELIMITER);
int rightFarDelimiter = getRequiredDelimiterInReverse(right,
rightDelimiter, rlength - (rightDelimiter - roffset),
HRegionInfo.DELIMITER);
// Now compare middlesection of row.
result = super.compareRows(left, leftDelimiter,
leftFarDelimiter - leftDelimiter, right, rightDelimiter,
rightFarDelimiter - rightDelimiter);
if (result != 0) {
return result;
}
// Compare last part of row, the rowid.
leftFarDelimiter++;
rightFarDelimiter++;
result = compareRowid(left, leftFarDelimiter,
llength - (leftFarDelimiter - loffset),
right, rightFarDelimiter, rlength - (rightFarDelimiter - roffset));
return result;
}
protected int compareRowid(byte[] left, int loffset, int llength,
byte[] right, int roffset, int rlength) {
return Bytes.compareTo(left, loffset, llength, right, roffset, rlength);
}
}
/**
* Compare key portion of a {@link KeyValue}.
*/
public static class KeyComparator implements RawComparator<byte []> {
volatile boolean ignoreTimestamp = false;
volatile boolean ignoreType = false;
public int compare(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 column family. Start compare past row and family length.
int lcolumnoffset = Bytes.SIZEOF_SHORT + lrowlength + 1 + loffset;
int rcolumnoffset = Bytes.SIZEOF_SHORT + rrowlength + 1 + roffset;
int lcolumnlength = llength - TIMESTAMP_TYPE_SIZE -
(lcolumnoffset - loffset);
int rcolumnlength = rlength - TIMESTAMP_TYPE_SIZE -
(rcolumnoffset - roffset);
// if row matches, and no column in the 'left' AND put type is 'minimum',
// then return that left is larger than right.
// This supports 'last key on a row' - the magic is if there is no column in the
// left operand, and the left operand has a type of '0' - magical value,
// then we say the left is bigger. This will let us seek to the last key in
// a row.
byte ltype = left[loffset + (llength - 1)];
byte rtype = right[roffset + (rlength - 1)];
if (lcolumnlength == 0 && ltype == Type.Minimum.getCode()) {
return 1; // left is bigger.
}
if (rcolumnlength == 0 && rtype == Type.Minimum.getCode()) {
return -1;
}
// TODO the family and qualifier should be compared separately
compare = Bytes.compareTo(left, lcolumnoffset, lcolumnlength, right,
rcolumnoffset, rcolumnlength);
if (compare != 0) {
return compare;
}
if (!this.ignoreTimestamp) {
// Get timestamps.
long ltimestamp = Bytes.toLong(left,
loffset + (llength - TIMESTAMP_TYPE_SIZE));
long rtimestamp = Bytes.toLong(right,
roffset + (rlength - TIMESTAMP_TYPE_SIZE));
compare = compareTimestamps(ltimestamp, rtimestamp);
if (compare != 0) {
return compare;
}
}
if (!this.ignoreType) {
// Compare types. Let the delete types sort ahead of puts; i.e. types
// of higher numbers sort before those of lesser numbers
return (0xff & rtype) - (0xff & ltype);
}
return 0;
}
public int compare(byte[] left, byte[] right) {
return compare(left, 0, left.length, right, 0, right.length);
}
public int compareRows(byte [] left, int loffset, int llength,
byte [] right, int roffset, int rlength) {
return Bytes.compareTo(left, loffset, llength, right, roffset, rlength);
}
protected int compareColumns(
byte [] left, int loffset, int llength, final int lfamilylength,
byte [] right, int roffset, int rlength, final int rfamilylength) {
return KeyValue.compareColumns(left, loffset, llength, lfamilylength,
right, roffset, rlength, rfamilylength);
}
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;
}
}
// HeapSize
public long heapSize() {
return ClassSize.align(ClassSize.OBJECT + (2 * ClassSize.REFERENCE) +
ClassSize.align(ClassSize.ARRAY) + ClassSize.align(length) +
(3 * Bytes.SIZEOF_INT) +
ClassSize.align(ClassSize.ARRAY) +
(2 * Bytes.SIZEOF_LONG));
}
// this overload assumes that the length bytes have already been read,
// and it expects the length of the KeyValue to be explicitly passed
// to it.
public void readFields(int length, final DataInput in) throws IOException {
this.length = length;
this.offset = 0;
this.bytes = new byte[this.length];
in.readFully(this.bytes, 0, this.length);
}
// Writable
public void readFields(final DataInput in) throws IOException {
int length = in.readInt();
readFields(length, in);
}
public void write(final DataOutput out) throws IOException {
out.writeInt(this.length);
out.write(this.bytes, this.offset, this.length);
}
}