about the length of Text

[ma qiang]

Hi all;
    A error happen in my program and system print as below:
        java.lang.OutOfMemoryError: Java heap space
        at java.util.Arrays.copyOf(Arrays.java:2786)
        at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:94)
        at java.io.DataOutputStream.write(DataOutputStream.java:90)
        at org.apache.hadoop.io.Text.write(Text.java:243)
        at 
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:349)
        at MyTest.map(UserMinHashMap.java:43)
        at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:192)
        at 
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1787)

and I think the error happen here: output.collect(new
Text(testKeyString),new Text(testValueString));
I'm not sure why? I guess the reason is the length of testValueString
is too large to construct Text or write into HD.   Who can tell why?

Thanks very much
Best Wishes!