Christopher Tubbs created ACCUMULO-3267:
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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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