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Date: Fri, 28 Oct 2011 23:21:33 +0000 (UTC)
From: "Aaron T. Myers (Created) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-2510) Add HA-related metrics
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Add HA-related metrics
----------------------

                 Key: HDFS-2510
                 URL: https://issues.apache.org/jira/browse/HDFS-2510
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: data-node, name-node
    Affects Versions: HA branch (HDFS-1623)
            Reporter: Aaron T. Myers
            Assignee: Aaron T. Myers


Off the top of my head, I can think of:

NN metrics:

* A binary metric for active or standby
* The size of the pending DN message queues
* A timestamp for when the standby NN last read from shared edit log
* The difference between highest generation stamp seen from the shared edit log and the highest generation stamp seen from any DN

It would probably also be useful to have a DN metric which somehow describes which active/standby NNs its talking to, e.g. "times since last communicated with standby/active NNs."

I'm sure there are others as well. Comments strongly encouraged.

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