Hello! I have been looking through some of the Hadoop code and I see that there are (at least) four different ways used to join a collection of Strings with a delimiter:
1) org.apache.hadoop.util.StringUtils.join(...) 2) org.apache.commons.lang.StringUtils.join(...) 3) com.google.common.base.Joiner 4) Manual - StringBuilder/For-Loop This question came to me when I was looking to replace some instances of "Manual" with a library approach. Is there a preferred way of doing it? The Hadoop StringUtils did not have the signature I was looking for: StringUtils.join(Object[]). However, Apache Commons and Google Guava both support the signature. I imagine one would want to "Eat their own dog food" and use the Apache Commons library, however, there would be some issues on the import list, trying to user two classes with the same name. Should I bring over the required Join methods from Apache Commons and place them into the Hadoop library? Should we be using the Joiner? Thanks.
