Mingliang Liu created HADOOP-13470:
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Summary: GenericTestUtils$LogCapturer is flaky
Key: HADOOP-13470
URL: https://issues.apache.org/jira/browse/HADOOP-13470
Project: Hadoop Common
Issue Type: Bug
Components: test, util
Affects Versions: 2.8.0
Reporter: Mingliang Liu
Assignee: Mingliang Liu
{{GenericTestUtils$LogCapturer}} is useful for assertions against service logs.
However it should be fixed in following aspects:
# In the constructor, it uses the stdout appender's layout.
{code}
Layout layout = Logger.getRootLogger().getAppender("stdout").getLayout();
{code}
However, the stdout appender may be named "console" or alike which makes the
constructor throw NPE. Actually the layout does not matter and we can use a
default pattern layout that only captures application logs.
# {{stopCapturing()}} method is not working. The major reason is that the
{{appender}} internal variable is never assigned and thus removing it to stop
capturing makes no sense.
# It does not support {{org.slf4j.Logger}} which is preferred to log4j in many
modules.
# There is no unit test for it.
This jira is to address these.
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