@InterfaceAudience.Public
@InterfaceStability.Stable
public class KeyFieldBasedComparator<K,V>
extends org.apache.hadoop.io.WritableComparator
implements org.apache.hadoop.conf.Configurable
MRJobConfig.MAP_OUTPUT_KEY_FIELD_SEPERATOR
.Modifier and Type | Field and Description |
---|---|
static String |
COMPARATOR_OPTIONS |
Constructor and Description |
---|
KeyFieldBasedComparator() |
Modifier and Type | Method and Description |
---|---|
int |
compare(byte[] b1,
int s1,
int l1,
byte[] b2,
int s2,
int l2) |
org.apache.hadoop.conf.Configuration |
getConf() |
static String |
getKeyFieldComparatorOption(JobContext job)
Get the
KeyFieldBasedComparator options |
void |
setConf(org.apache.hadoop.conf.Configuration conf) |
static void |
setKeyFieldComparatorOptions(Job job,
String keySpec)
Set the
KeyFieldBasedComparator options used to compare keys. |
compare, compare, compareBytes, define, get, get, getKeyClass, hashBytes, hashBytes, newKey, readDouble, readFloat, readInt, readLong, readUnsignedShort, readVInt, readVLong
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
equals
public static String COMPARATOR_OPTIONS
public void setConf(org.apache.hadoop.conf.Configuration conf)
setConf
in interface org.apache.hadoop.conf.Configurable
setConf
in class org.apache.hadoop.io.WritableComparator
public org.apache.hadoop.conf.Configuration getConf()
getConf
in interface org.apache.hadoop.conf.Configurable
getConf
in class org.apache.hadoop.io.WritableComparator
public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2)
compare
in interface org.apache.hadoop.io.RawComparator
compare
in class org.apache.hadoop.io.WritableComparator
public static void setKeyFieldComparatorOptions(Job job, String keySpec)
KeyFieldBasedComparator
options used to compare keys.keySpec
- the key specification of the form -k pos1[,pos2], where,
pos is of the form f[.c][opts], where f is the number
of the key field to use, and c is the number of the first character from
the beginning of the field. Fields and character posns are numbered
starting with 1; a character position of zero in pos2 indicates the
field's last character. If '.c' is omitted from pos1, it defaults to 1
(the beginning of the field); if omitted from pos2, it defaults to 0
(the end of the field). opts are ordering options. The supported options
are:
-n, (Sort numerically)
-r, (Reverse the result of comparison)public static String getKeyFieldComparatorOption(JobContext job)
KeyFieldBasedComparator
optionsCopyright © 2019 Apache Software Foundation. All Rights Reserved.