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From joshelser <...@git.apache.org>
Subject [GitHub] accumulo pull request #211: ACCUMULO-4480 - update user manual for 1.8
Date Sat, 04 Feb 2017 22:50:31 GMT
Github user joshelser commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/211#discussion_r99477035
  
    --- Diff: docs/src/main/asciidoc/chapters/administration.txt ---
    @@ -1182,17 +1182,19 @@ 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.
    -
    -
    -
    -
    -
    -
    -
    +Hadoop will include stability bugs that greatly affect overall stability.
    +Release notes typically contain information about versions used in
    +release testing.
    +
    +The following table shows the Hadoop, Zookeeper and
    +Thrift versions defined in the dependency section of the POM for building the
    +artifacts.  
    +
    +|================================================
    +|Accumulo |Hadoop |Zookeeper |Thrift
    +|1.7            |2.2.0     |3.4.6          |0.9.1
    +|1.8            |2.6.4     |3.4.6          |0.9.3
    +|================================================
    +
    --- End diff --
    
    In my experience, most users who are not using some vendor's packaging, find this kind
of information very helpful. Generally, users/admins have no clue where to even look to gauge
what is "compatible" (to earlier or later versions of dependencies).
    
    That said, fewer and fewer people seem to be taking on this task and prefer to just rely
on some external entity to tell them what is "compatible". Perhaps we could simplify this
table to say something like "there are no known compatibility issues since Hadoop-2.2.x and
ZooKeeper-3.4.x"? This would lead naturally into documenting the incompatibilities if/when
they crop up again.


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