Dataload splits two of the HBase tables to provide consistent state for frontend tests. However, sometimes HBase will change and the splitting code will fail. Since this is happening during dataload, the whole invocation of buildall.sh fails. This means that no tests run and any minor problem with HBase can impact all testing, even of things that are not impacted by the HBase splitting.
The HBase splitting should not fail dataload. Some tests may fail, but the tests that are unrelated can run and pass.