Ctest created HADOOP-16962:
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Summary: Making `getBoolean` log warning message for unrecognized
value
Key: HADOOP-16962
URL: https://issues.apache.org/jira/browse/HADOOP-16962
Project: Hadoop Common
Issue Type: Bug
Components: conf
Reporter: Ctest
*Problem:*
In `Configuration.java`, the `getBoolean` can accept any valueString and return
the default value for any string except “true” or “false” (ignoring case):
{code:java}
if (StringUtils.equalsIgnoreCase("true", valueString))
return true;
else if (StringUtils.equalsIgnoreCase("false", valueString))
return false;
else return defaultValue;{code}
If the user misspells some boolean configuration value, for example, “true” to
“ture”, then getBoolean will directly return the default value without logging
any warning message. If the default value is “false”, then Hadoop is actually
using a totally different value (“false”) compared to the user’s expectation
(“true”) and the user even doesn’t know it.
*Solution:*
We can log one warning message before getBoolean return the default value for
unrecognized value:
{code:java}
if (StringUtils.equalsIgnoreCase("true", valueString))
return true;
else if (StringUtils.equalsIgnoreCase("false", valueString))
return false;
else {
LOG.warn("Invalid value for boolean: " + valueString +
", choose default value: " + defaultValue + " for " + name);
return defaultValue;
}{code}
I attach a patch to log the warning message.
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