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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10673) Update rpc metrics when the call throws an exception
Date Mon, 16 Jun 2014 23:26:02 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-10673?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Ming Ma updated HADOOP-10673:

    Attachment: HADOOP-10673-6.patch

Thanks, Tsuyoshi. [~lohit] asked a good question how the increase of the number of metrics
will impact metrics subsystem. The most common one might be StandbyException, which can be
thrown regardless of methods. Other exceptions are likely to be specific to certain methods.
Based on the current number of metrics, JMX size; number of methods, a very rough estimate
can put the increase to around 10-15% for NN.

So to be safe, we can aggregate by exception class name instead; that will still provide useful
information (from the exception name, we can find the possible methods).

Here is the updated patch.

> Update rpc metrics when the call throws an exception
> ----------------------------------------------------
>                 Key: HADOOP-10673
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10673
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>         Attachments: HADOOP-10673-2.patch, HADOOP-10673-4.patch, HADOOP-10673-5.patch,
HADOOP-10673-6.patch, HADOOP-10673.patch
> Currently RPC metrics isn't updated when the call throws an exception. We can either
update the existing metrics or have a new set of metrics in the case of exception.

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