LocalJobRunner assigns duplicate mapid's
----------------------------------------
Key: HADOOP-387
URL: http://issues.apache.org/jira/browse/HADOOP-387
Project: Hadoop
Issue Type: Bug
Components: mapred
Affects Versions: 0.4.0
Environment: xp, cygwin, jdk1.4.2_12
Reporter: Sami Siren
While hunting down nutch issue NUTCH-266 i discovered that id's are generated
with following fragment of code:
private String newId() {
return Integer.toString(Math.abs(new Random().nextInt()),36);
}
and the related Javadoc:
"
public Random()
Creates a new random number generator. Its seed is initialized to a value
based on the current time:
public Random() { this(System.currentTimeMillis()); }
Two Random objects created within the same millisecond will have the same
sequence of random numbers.
"
it appears that in this case there are more than one Random pobject generated
at the same millisecond and id's are
no longer unique.
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