Hadoop 0.18.x, a performance was improved.

After update to hadoop 0.18.x from hadoop 0.17.x for Hama, the speed of JUnit test and some processing was dramatically improved w/o hama algorithm changes.


Before:

[junit] Running org.apache.hama.TestDenseMatrix
[junit] Tests run: 6, Failures: 0, Errors: 0, Time elapsed: 89.078 sec
[junit] Running org.apache.hama.TestDenseVector
[junit] Tests run: 5, Failures: 0, Errors: 0, Time elapsed: 34.394 sec

After:

[junit] Running org.apache.hama.TestDenseMatrix
[junit] Tests run: 6, Failures: 0, Errors: 0, Time elapsed: 58.842 sec
[junit] Running org.apache.hama.TestDenseVector
[junit] Tests run: 5, Failures: 0, Errors: 0, Time elapsed: 26.519 sec

Here are issues that impact 0.18.x

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