[jira] [Updated] (HADOOP-18920) RPC Metrics : Optimize logic for log slow RPCs

["Shilun Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-18920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shilun Fan updated HADOOP-18920:
--------------------------------
    Component/s: metrics

> RPC Metrics : Optimize logic for log slow RPCs
> ----------------------------------------------
>
>                 Key: HADOOP-18920
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18920
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: metrics
>    Affects Versions: 3.4.0
>            Reporter: Haiyang Hu
>            Assignee: Haiyang Hu
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.4.0
>
>
> HADOOP-12325 implement a capability where "slow" RPCs are logged in NN log.
> Current processing logic is the "slow" RPCs are to be those whose processing time is outside 3 standard deviation.
> However, in practice it is found that many logs of slow rpc are currently output, and sometimes RPCs with a processing time of 1ms are also declared as slow, this is not in line with actual expectations.
> Therefore, consider optimize the logic conditions of slow RPC and add a `logSlowRPCThresholdMs` variable to judge whether the current RPCas slow so that the expected slow RPC log can be logger.
> for `logSlowRPCThresholdMs`, we can support dynamic refresh to facilitate adjustments based on the actual operating conditions of the hdfs cluster.



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