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From joshelser <...@git.apache.org>
Subject [GitHub] accumulo pull request #211: ACCUMULO-4480 - update user manual for 1.8
Date Thu, 09 Feb 2017 19:20:56 GMT
Github user joshelser commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/211#discussion_r100388645
  
    --- Diff: docs/src/main/asciidoc/chapters/administration.txt ---
    @@ -1175,24 +1175,16 @@ the system to full capacity without administrator interaction
after many of the
     common failure modes.
     
     ==== Tested Versions
    -Another large consideration for Accumulo stability is to use versions of
    -software that have been tested together in a VM environment. Any cluster of
    -processes that have not been tested together are likely to expose running
    -conditions that vary from the environments individually tested in the various
    -components. For example, Accumulo's use of HDFS includes many short block
    -reads, which differs from the more common full file read used in most
    -map/reduce applications. We have found that certain versions of Accumulo and
    -Hadoop will include stability bugs that greatly affect overall stability. In
    -our testing, Accumulo 1.6.2, Hadoop 2.6.0, and Zookeeper 3.4.6 resulted in a
    -stable VM clusters that did not fail a month of testing, while Accumulo 1.6.1,
    -Hadoop 2.5.1, and Zookeeper 3.4.5 had a mean time between failure of less than
    -a week under heavy ingest and query load. We expect that results will vary with
    -other configurations, and you should choose your software versions with that in
    -mind.
    -
    -
    -
    -
    -
    -
    -
    +Each release of Accumulo is built with a specific version of Apache
    +Hadoop, Apache ZooKeeper and Apache Thrift.  We expect Accumulo to
    +work with versions that are API compatable with those versions.
    +However this compatibility is not guaranteed because Hadoop, ZooKeeper
    +and Thift may not provide guarantees between their own versions. We
    +have also found that certain versions of Accumulo and Hadoop included
    +bugs that greatly affected overall stability.  Thrift is particularly
    +prone to compatablity changes between versions and it is strongly
    +recommended that you use the same version your Accumulo is built
    --- End diff --
    
    Would suggest "you must use the same version" instead of "it is strongly recommended".
There is no universe (presently) in which you can use a version of Thrift that isn't the one
we use. Right?


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