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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-3267) Insufficient validation for bad configuration
Date Mon, 27 Oct 2014 21:09:33 GMT
Christopher Tubbs created ACCUMULO-3267:
-------------------------------------------

             Summary: Insufficient validation for bad configuration
                 Key: ACCUMULO-3267
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3267
             Project: Accumulo
          Issue Type: Improvement
    Affects Versions: 1.6.0
            Reporter: Christopher Tubbs


A user reported to me that they had tried using the 512MB native-standalone example configuration
with Hadoop 1, and without compiling the native libraries.

They saw two errors:
# There was an {{IllegalArgumentException}} coming from {{TabletServerResearceManager}}'s
constructor about trying to allocate more memory than available to the JVM.
# init failed because it could not found the core-site.xml file (because the default examples
assume Hadoop 2).

In both cases, the error messages were misleading and/or insufficient. The actual problem
in the first case was that the user specified to use native maps in the configuration, but
those were not loadable. This is a configuration error, and we can/should validate it sooner,
with a more obvious error message.

In the second case, the problem was because we could not auto-discover the location for the
Hadoop configuration directory in the accumulo-env.sh script so it can be added to the classpath.
The error message occurs later, when we're unable to read the file, but we could fail sooner,
perhaps in the {{bin/accumulo}}, when we can't find everything we require from the environment.
I think a proper long-term fix for this is to stop making assumptions about directory layouts,
and explicitly ask for the bootstrap classpath in the environment, but a better warning message
is a good short-term fix.



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