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https://issues.apache.org/jira/browse/HADOOP-12325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14710087#comment-14710087
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Xiaoyu Yao commented on HADOOP-12325:
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Thanks [~anu] updating the patch! The Jenkins result looks good to me. I will
commit it shortly.
Ignore the checkstyle issue "Variable 'rpcSlowCalls' must be private and have
accessor methods." since it is inconsistent with the existing code.
> 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, HADOOP-12325.005.patch, HADOOP-12325.005.test.patch,
> HADOOP-12325.006.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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