Thank you so much for your reply. I have tried what you told.
I have opened pom.xml. I have seendifferent profile id(s) and by default Hadoop-0.20.203 is true. I have changed by default activation property to Hadoop-2.0.0 but build failed with -
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR] The project org.apache.giraph:giraph-core:1.0.0 (/giraph-folder/giraph-core/pom.xml) has 1 error
[ERROR] Non-parseable POM /giraph-folder/giraph-core/pom.xml: TEXT must be immediately followed by END_TAG and not START_TAG (position: START_TAG seen ...<activation>\n <activeByDefault>... @826:26) @ /home/agrta/giraph-1.0nw/pom.xml, line 826, column 26 -> [Help 2]