'hadoop' script should set LANG or LC_COLLATE explicitly for classpath order
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Key: HADOOP-6997
URL: https://issues.apache.org/jira/browse/HADOOP-6997
Project: Hadoop Common
Issue Type: Bug
Components: scripts
Affects Versions: 0.21.0, 0.20.2, 0.22.0
Reporter: Greg Roelofs
The 'hadoop' script builds the classpath in pieces, including the following bit
for the bulk of it:
{noformat}
# add libs to CLASSPATH
for f in $HADOOP_HOME/lib/*.jar; do
CLASSPATH=${CLASSPATH}:$f;
done
{noformat}
The ordering of "*.jar", i.e., the collation order, depends on either LANG or
LC_COLLATE on Linux systems. In the absence of either one, the script will
default to whatever the user's environment specifies; for Red Hat, the default
is "en_US", which is a case-insensitive (and punctuation-insensitive?)
ordering. If LANG is set to "C" instead, the ordering changes to the
ASCII/UTF-8 byte ordering.
The key issue here is that $HADOOP_HOME/lib contains both upper- and lowercase
jar names (e.g., "SimonTool.jar" and "commons-logging-1.1.1.jar", to pick a
completely random pair), which will have an inverted order depending on which
setting is used.
'hadoop' should explicitly set LANG and/or LC_COLLATE to whatever setting it's
implicitly assuming.
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