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Date: Mon, 18 Jan 2016 02:02:39 +0000 (UTC)
From: "Vikram Srivastava (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HADOOP-12702) Add an HDFS metrics sink
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    [ https://issues.apache.org/jira/browse/HADOOP-12702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15104060#comment-15104060 ] 

Vikram Srivastava commented on HADOOP-12702:
--------------------------------------------

FileSystem.create(Path) will delete any existing file (line 108). I think we should check if a file already exists and in that case append to it instead of overwriting 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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