Trivial Description
in test/system/randomwalk/bin/copy-config.sh
"$HADOOP_PREFIX/bin/hadoop" fs -rmr randomwalk 2>/dev/null
RandomWalk should not try to write to the root of HDFS. This is likely to be disallowed by HDFS permissions.
"$HADOOP_PREFIX/bin/hadoop" fs -setrep 3 randomwalk/config.tgz
It would be nice to use some context to avoid setrep'ing to a value higher than the allowed max or the number of datanodes (e.g. don't need to setrep at all if we only have one datanode). hdfs dfsadmin -report might have some info that could be scraped?