Daniel Templeton created HDFS-14121:
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Summary: Log message about the old hosts file format is misleading
Key: HDFS-14121
URL: https://issues.apache.org/jira/browse/HDFS-14121
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 3.0.0
Reporter: Daniel Templeton
In {{CombinedHostsFileReader.readFile()}} we have the following:
{code} LOG.warn("{} has invalid JSON format." +
"Try the old format without top-level token defined.",
hostsFile);{code}
That message is trying to say that we tried parsing the hosts file as a
well-formed JSON file and failed, so we're going to try again assuming that
it's in the old badly-formed format. What it actually says is that the hosts
fie is bad, and the admin should try switching to the old format. Those are
two very different things.
While were in there, we should refactor the logging so that instead of
reporting that we're going to try using a different parser (who the heck
cares?), we report that the we had to use the old parser to successfully parse
the hosts file.
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