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Yahoo! Hadoop User Group - May 2010 Meetup - Apache Hadoop Release Plans for 0.21.0, Tom White, Cloudera
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Yahoo! Hadoop User Group - May 2010 Meetup - Apache Hadoop Release Plans for 0.21.0, Tom White, Cloudera

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  • 1. Apache Hadoop 0.21 Release Plans Tom White tomwhite@apache.org 19 May 2010
  • 2. Avoiding the quality death spiral Solaris went through a very interesting transition. Prior to Solaris 2.5, there was much more of a, for lack of a better word, waterfall model in terms of the way new releases were dispersed to people. As a result, people would not run the latest bits on their desktop or on the server; they would develop their own little bits and integrate them into a whole that they never saw. Solaris was in the quality death spiral because once people refused to use the latest stuf because it was known to be broken, then people used the latest stuf less and less and it got to be more and more broken. To break the quality death spiral, you’ve got to force people to use the latest stuf. I think it’s much more important when you’re in a distributed environment where you don’t necessarily have the kind of immediate peer pressure to do that. --Bryan Cantrill, http://queue.acm.org/detail.cfm?id=1413258
  • 3. Release History
  • 4. Source Compatibility
  • 5. Process ▪ Fix blockers – http://bit.ly/common21blockers, hdfs21blockers, mapreduce21blockers ▪ Create build artifacts – First post split release ▪ Test – http://wiki.apache.org/hadoop/ReleaseTesting ▪ Vote and release ▪ Later 0.21.x bug fx releases for critical bugs or regressions
  • 6. How to help out ▪ Fix blockers ▪ Try compiling your code against 0.21 ▪ Try out release candidates on your (test) cluster ▪ Try out releases on your (test) cluster ▪ Caveat emptor: 0.21.0 should not be used for production
  • 7. What's in it? ▪ New, comprehensive MapReduce API ▪ Symlinks FileContext API (although not integrated with MapReduce) ▪ New shufe ▪ Hundreds of bug fxes and other improvements – https://svn.apache.org/repos/asf/hadoop/{common,hdfs,mapreduce}/branches/branch- 0.21/CHANGES.txt ▪ Not security (0.22 at end of year)
  • 8. (c) 2008 Cloudera, Inc. or its licensors.  "Cloudera" is a registered trademark of Cloudera, Inc.. All rights reserved. 1.0