[jira] [Created] (HADOOP-16431) Change Log Level to trace in IOUtils.java and ExceptionDiags.java

["Lisheng Sun (JIRA)" <ji...@apache.org>]

Lisheng Sun created HADOOP-16431:
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             Summary: Change Log Level to trace in IOUtils.java and ExceptionDiags.java
                 Key: HADOOP-16431
                 URL: https://issues.apache.org/jira/browse/HADOOP-16431
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Lisheng Sun


When there is no String Constructor for the exception, we Log a Warn Message, and rethrow the exception. We can change the Log level to TRACE/DEBUG.
{code:java}
private static <T extends IOException> T wrapWithMessage(
  T exception, String msg) {
  Class<? extends Throwable> clazz = exception.getClass();
  try {
    Constructor<? extends Throwable> ctor =
      clazz.getConstructor(String.class);
    Throwable t = ctor.newInstance(msg);
    return (T) (t.initCause(exception));
  } catch (Throwable e) {
    LOG.trace("Unable to wrap exception of type " +
             clazz + ": it has no (String) constructor", e);
    return exception;
  }
}
{code}



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