Major Description
It fails a bunch, about one in five runs: https://builds.apache.org/view/H-L/view/HBase/job/HBase-1.2/417/jdk=latest1.7,label=Hadoop/testReport/junit/org.apache.hadoop.hbase.mapreduce/TestRowCounter/testRowCounterTimeRange/history/
Looking at log it seems to be making good progress without issue but the test is running four mapreduce tasks and it wants to finish inside three minutes (medium sized test).