org.apache.hadoop.hbase.client.Increment Maven / Gradle / Ivy
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*
* 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.client;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.NavigableMap;
import java.util.TreeMap;
import java.util.UUID;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.io.TimeRange;
import org.apache.hadoop.hbase.security.access.Permission;
import org.apache.hadoop.hbase.security.visibility.CellVisibility;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.ClassSize;
/**
* Used to perform Increment operations on a single row.
*
* This operation ensures atomicity to readers. Increments are done
* under a single row lock, so write operations to a row are synchronized, and
* readers are guaranteed to see this operation fully completed.
*
* To increment columns of a row, instantiate an Increment object with the row
* to increment. At least one column to increment must be specified using the
* {@link #addColumn(byte[], byte[], long)} method.
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class Increment extends Mutation implements Comparable {
private static final long HEAP_OVERHEAD = (long) ClassSize.REFERENCE + ClassSize.TIMERANGE;
private TimeRange tr = new TimeRange();
/**
* Create a Increment operation for the specified row.
*
* At least one column must be incremented.
* @param row row key (we will make a copy of this).
*/
public Increment(byte [] row) {
this(row, 0, row.length);
}
/**
* Create a Increment operation for the specified row.
*
* At least one column must be incremented.
* @param row row key (we will make a copy of this).
*/
public Increment(final byte [] row, final int offset, final int length) {
checkRow(row, offset, length);
this.row = Bytes.copy(row, offset, length);
}
/**
* Copy constructor
* @param i
*/
public Increment(Increment i) {
this.row = i.getRow();
this.ts = i.getTimeStamp();
this.tr = i.getTimeRange();
this.familyMap.putAll(i.getFamilyCellMap());
for (Map.Entry entry : i.getAttributesMap().entrySet()) {
this.setAttribute(entry.getKey(), entry.getValue());
}
super.setPriority(i.getPriority());
}
/**
* Add the specified KeyValue to this operation.
* @param cell individual Cell
* @return this
* @throws java.io.IOException e
*/
public Increment add(Cell cell) throws IOException{
byte [] family = CellUtil.cloneFamily(cell);
List| list = getCellList(family);
//Checking that the row of the kv is the same as the put
int res = Bytes.compareTo(this.row, 0, row.length,
cell.getRowArray(), cell.getRowOffset(), cell.getRowLength());
if (res != 0) {
throw new WrongRowIOException("The row in " + cell +
" doesn't match the original one " + Bytes.toStringBinary(this.row));
}
list.add(cell);
return this;
}
/**
* Increment the column from the specific family with the specified qualifier
* by the specified amount.
*
* Overrides previous calls to addColumn for this family and qualifier.
* @param family family name
* @param qualifier column qualifier
* @param amount amount to increment by
* @return the Increment object
*/
public Increment addColumn(byte [] family, byte [] qualifier, long amount) {
if (family == null) {
throw new IllegalArgumentException("family cannot be null");
}
if (qualifier == null) {
throw new IllegalArgumentException("qualifier cannot be null");
}
List| list = getCellList(family);
KeyValue kv = createPutKeyValue(family, qualifier, ts, Bytes.toBytes(amount));
list.add(kv);
return this;
}
/**
* Gets the TimeRange used for this increment.
* @return TimeRange
*/
public TimeRange getTimeRange() {
return this.tr;
}
/**
* Sets the TimeRange to be used on the Get for this increment.
*
* This is useful for when you have counters that only last for specific
* periods of time (ie. counters that are partitioned by time). By setting
* the range of valid times for this increment, you can potentially gain
* some performance with a more optimal Get operation.
*
* This range is used as [minStamp, maxStamp).
* @param minStamp minimum timestamp value, inclusive
* @param maxStamp maximum timestamp value, exclusive
* @throws IOException if invalid time range
* @return this
*/
public Increment setTimeRange(long minStamp, long maxStamp)
throws IOException {
tr = new TimeRange(minStamp, maxStamp);
return this;
}
/**
* @param returnResults True (default) if the increment operation should return the results. A
* client that is not interested in the result can save network bandwidth setting this
* to false.
*/
@Override
public Increment setReturnResults(boolean returnResults) {
super.setReturnResults(returnResults);
return this;
}
/**
* @return current setting for returnResults
*/
// This method makes public the superclasses's protected method.
@Override
public boolean isReturnResults() {
return super.isReturnResults();
}
/**
* Method for retrieving the number of families to increment from
* @return number of families
*/
@Override
public int numFamilies() {
return this.familyMap.size();
}
/**
* Method for checking if any families have been inserted into this Increment
* @return true if familyMap is non empty false otherwise
*/
public boolean hasFamilies() {
return !this.familyMap.isEmpty();
}
/**
* Before 0.95, when you called Increment#getFamilyMap(), you got back
* a map of families to a list of Longs. Now, {@link #getFamilyCellMap()} returns
* families by list of Cells. This method has been added so you can have the
* old behavior.
* @return Map of families to a Map of qualifiers and their Long increments.
* @since 0.95.0
*/
public Map> getFamilyMapOfLongs() {
NavigableMap> map = super.getFamilyCellMap();
Map> results =
new TreeMap>(Bytes.BYTES_COMPARATOR);
for (Map.Entry> entry: map.entrySet()) {
NavigableMap longs = new TreeMap(Bytes.BYTES_COMPARATOR);
for (Cell cell: entry.getValue()) {
longs.put(CellUtil.cloneQualifier(cell),
Bytes.toLong(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength()));
}
results.put(entry.getKey(), longs);
}
return results;
}
/**
* @return String
*/
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("row=");
sb.append(Bytes.toStringBinary(this.row));
if(this.familyMap.size() == 0) {
sb.append(", no columns set to be incremented");
return sb.toString();
}
sb.append(", families=");
boolean moreThanOne = false;
for(Map.Entry> entry: this.familyMap.entrySet()) {
if(moreThanOne) {
sb.append("), ");
} else {
moreThanOne = true;
sb.append("{");
}
sb.append("(family=");
sb.append(Bytes.toString(entry.getKey()));
sb.append(", columns=");
if(entry.getValue() == null) {
sb.append("NONE");
} else {
sb.append("{");
boolean moreThanOneB = false;
for(Cell cell : entry.getValue()) {
if(moreThanOneB) {
sb.append(", ");
} else {
moreThanOneB = true;
}
sb.append(CellUtil.getCellKeyAsString(cell) + "+=" +
Bytes.toLong(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength()));
}
sb.append("}");
}
}
sb.append("}");
return sb.toString();
}
@Override
public int compareTo(Row i) {
// TODO: This is wrong. Can't have two the same just because on same row.
return Bytes.compareTo(this.getRow(), i.getRow());
}
@Override
public int hashCode() {
// TODO: This is wrong. Can't have two gets the same just because on same row. But it
// matches how equals works currently and gets rid of the findbugs warning.
return Bytes.hashCode(this.getRow());
}
@Override
public boolean equals(Object obj) {
// TODO: This is wrong. Can't have two the same just because on same row.
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
Row other = (Row) obj;
return compareTo(other) == 0;
}
@Override
protected long extraHeapSize(){
return HEAP_OVERHEAD;
}
@Override
public Increment setAttribute(String name, byte[] value) {
return (Increment) super.setAttribute(name, value);
}
@Override
public Increment setId(String id) {
return (Increment) super.setId(id);
}
@Override
@Deprecated
public Increment setWriteToWAL(boolean write) {
return (Increment) super.setWriteToWAL(write);
}
@Override
public Increment setDurability(Durability d) {
return (Increment) super.setDurability(d);
}
@Override
public Increment setFamilyCellMap(NavigableMap> map) {
return (Increment) super.setFamilyCellMap(map);
}
@Override
@Deprecated
public Increment setFamilyMap(NavigableMap> map) {
return (Increment) super.setFamilyMap(map);
}
@Override
public Increment setClusterIds(List clusterIds) {
return (Increment) super.setClusterIds(clusterIds);
}
@Override
public Increment setCellVisibility(CellVisibility expression) {
return (Increment) super.setCellVisibility(expression);
}
@Override
public Increment setACL(String user, Permission perms) {
return (Increment) super.setACL(user, perms);
}
@Override
public Increment setACL(Map perms) {
return (Increment) super.setACL(perms);
}
@Override
public Increment setTTL(long ttl) {
return (Increment) super.setTTL(ttl);
}
@Override
public Increment setPriority(int priority) {
return (Increment) super.setPriority(priority);
}
}
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