Increase size of logs to 5x 2MB per node, instead of 5x 256kB.

Author: arnocandel

src/main/java/water/util/Log.java

@@ -330,7 +330,7 @@ private static org.apache.log4j.Logger createLog4jLogger(String logDirParent) {
         p.setProperty("log4j.rootLogger", "INFO, R");
         p.setProperty("log4j.appender.R", "org.apache.log4j.RollingFileAppender");
         p.setProperty("log4j.appender.R.File", logPathFileName);
-        p.setProperty("log4j.appender.R.MaxFileSize", "256KB");
+        p.setProperty("log4j.appender.R.MaxFileSize", "2MB");
         p.setProperty("log4j.appender.R.MaxBackupIndex", "5");
         p.setProperty("log4j.appender.R.layout", "org.apache.log4j.PatternLayout");