|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object org.apache.hadoop.mapreduce.ID org.apache.hadoop.mapred.ID org.apache.hadoop.mapreduce.JobID
@InterfaceAudience.Public @InterfaceStability.Stable public class JobID
JobID represents the immutable and unique identifier for
the job. JobID consists of two parts. First part
represents the jobtracker identifier, so that jobID to jobtracker map
is defined. For cluster setup this string is the jobtracker
start time, for local setting, it is "local" and a random number.
Second part of the JobID is the job number.
An example JobID is :
job_200707121733_0003
, which represents the third job
running at the jobtracker started at 200707121733
.
Applications should never construct or parse JobID strings, but rather
use appropriate constructors or forName(String)
method.
TaskID
,
TaskAttemptID
Field Summary | |
---|---|
protected static NumberFormat |
idFormat
|
static String |
JOB
|
static String |
JOBID_REGEX
|
Fields inherited from class org.apache.hadoop.mapreduce.ID |
---|
id, SEPARATOR |
Constructor Summary | |
---|---|
JobID()
|
|
JobID(String jtIdentifier,
int id)
Constructs a JobID object |
Method Summary | |
---|---|
StringBuilder |
appendTo(StringBuilder builder)
Add the stuff after the "job" prefix to the given builder. |
int |
compareTo(ID o)
Compare JobIds by first jtIdentifiers, then by job numbers |
boolean |
equals(Object o)
|
static JobID |
forName(String str)
Construct a JobId object from given string |
String |
getJtIdentifier()
|
int |
hashCode()
|
void |
readFields(DataInput in)
Deserialize the fields of this object from in . |
String |
toString()
|
void |
write(DataOutput out)
Serialize the fields of this object to out . |
Methods inherited from class org.apache.hadoop.mapreduce.ID |
---|
getId |
Methods inherited from class java.lang.Object |
---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Field Detail |
---|
public static final String JOB
public static final String JOBID_REGEX
protected static final NumberFormat idFormat
Constructor Detail |
---|
public JobID(String jtIdentifier, int id)
jtIdentifier
- jobTracker identifierid
- job numberpublic JobID()
Method Detail |
---|
public String getJtIdentifier()
public boolean equals(Object o)
equals
in class ID
public int compareTo(ID o)
compareTo
in interface Comparable<ID>
compareTo
in class ID
public StringBuilder appendTo(StringBuilder builder)
builder
- the builder to append to
public int hashCode()
hashCode
in class ID
public String toString()
toString
in class ID
public void readFields(DataInput in) throws IOException
Writable
in
.
For efficiency, implementations should attempt to re-use storage in the existing object where possible.
readFields
in interface Writable
readFields
in class ID
in
- DataInput
to deseriablize this object from.
IOException
public void write(DataOutput out) throws IOException
Writable
out
.
write
in interface Writable
write
in class ID
out
- DataOuput
to serialize this object into.
IOException
public static JobID forName(String str) throws IllegalArgumentException
IllegalArgumentException
- if the given string is malformed
|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |