protected String getWorkerLogWriter(SimpleVersion topoVersion) { String defaultGuess = "org.apache.storm.LogWriter"; if (topoVersion.getMajor() == 0) { //Prior to the org.apache change defaultGuess = "backtype.storm.LogWriter"; } NavigableMap<SimpleVersion, String> mains = Utils.getConfiguredWorkerLogWriterVersions(_conf); return Utils.getCompatibleVersion(mains, topoVersion, "worker log writer class", defaultGuess); }