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https://issues.apache.org/jira/browse/HADOOP-12702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15096230#comment-15096230
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Daniel Templeton commented on HADOOP-12702:
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If {{NetUtils.getHostname()}} gets an {{UnknownHostException}} from
{{InetAddress.getLocalhost()}}, then it returns the exception as a string.
Definitely not what I want to use as a filename. As I said above, I also don't
want some common default (like "localhost") because then multiple machines may
try logging to the same file. In the case that the link gets an
{{UnknownHostException}} from {{InetAddress.getLocalhost()}}, I think the best
approach is to simply let it kill the sink, i.e. don't catch it.
> Add an HDFS metrics sink
> ------------------------
>
> Key: HADOOP-12702
> URL: https://issues.apache.org/jira/browse/HADOOP-12702
> Project: Hadoop Common
> Issue Type: Improvement
> Components: metrics
> Affects Versions: 2.7.1
> Reporter: Daniel Templeton
> Assignee: Daniel Templeton
> Attachments: HADOOP-12702.001.patch
>
>
> We need a metrics2 sink that can write metrics to HDFS. The sink should
> accept as configuration a "directory prefix" and do the following in
> {{putMetrics()}}
> * Get yyyyMMddHH from current timestamp.
> * If HDFS dir "dir prefix" + yyyyMMddHH doesn't exist, create it. Close any
> currently open file and create a new file called <hostname>.log in the new
> directory.
> * Write metrics to the current log file.
> * If a write fails, it should be fatal to the process running the sink.
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