https://community.cloudera.com/t5/Support-Questions/TEZ-Parameter-Error-on-RUNTIME/m-p/106464#M69342 <A rel="user" href="https://community.cloudera.com/users/3731/sureshbk.html" nodeid="3731">@suresh krish</A><P>if you look at white list param,this param(<STRONG>tez.shuffle-vertex-manager.min-src-fraction</STRONG>) is not in white list so the following piece of code(HiveConf.java) throws cannot modify exception.</P><PRE>public void verifyAndSet(String name, String value) throws IllegalArgumentException { if (modWhiteListPattern != null) { Matcher wlMatcher = modWhiteListPattern.matcher(name); if (!wlMatcher.matches()) { throw new IllegalArgumentException("Cannot modify " + name + " at runtime. "+ "It is not in list of params that are allowed to be modified at runtime"); } } if (restrictList.contains(name)) { throw new IllegalArgumentException("Cannot modify " + name + " at runtime. It is in the list"+ "of parameters that can't be modified at runtime"); } isSparkConfigUpdated = isSparkRelatedConfig(name); set(name, value); }</PRE> Fri, 01 Jul 2016 19:09:12 GMT rajkumar_singh 2016-07-01T19:09:12Z