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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12325) RPC Metrics : Add the ability track and log slow RPCs
Date Fri, 21 Aug 2015 22:50:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14707597#comment-14707597

Xiaoyu Yao commented on HADOOP-12325:

[~anu], I can see Yarn/MR2 as part of Hadoop call into WritableRpcEngine#call from the call
graph. I still think we should refactor logSlowRpcCalls from ProtobufRpcEngine.java to Server.java.
Once we have that, changes in ProtobufRpcEngine and WritableRPCEngine should be minimal and

> RPC Metrics : Add the ability track and log slow RPCs
> -----------------------------------------------------
>                 Key: HADOOP-12325
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12325
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc, metrics
>    Affects Versions: 2.7.1
>            Reporter: Anu Engineer
>            Assignee: Anu Engineer
>         Attachments: Callers of WritableRpcEngine.call.png, HADOOP-12325.001.patch, HADOOP-12325.002.patch,
HADOOP-12325.003.patch, HADOOP-12325.004.patch
> This JIRA proposes to add a counter called RpcSlowCalls and also a configuration setting
that allows users to log really slow RPCs.  Slow RPCs are RPCs that fall at 99th percentile.
This is useful to troubleshoot why certain services like name node freezes under heavy load.

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