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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12916) Allow different Hadoop IPC Call Queue throttling policies with FCQ/BackOff
Date Fri, 18 Mar 2016 23:19:33 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15202352#comment-15202352
] 

Tsz Wo Nicholas Sze commented on HADOOP-12916:
----------------------------------------------

Thanks [~xyao].  Some comments on the patch.

- In CallQueueManager.createScheduler,
-* createScheduler should be static.
-* Should priorityLevels be passed in the second try-catch?

- Remove public from getPriorityLevel.

- In parseNumLevels, print ns in the warning.


- backOffByResponseTimeEnabled should be declared with a lower case boolean.

- The following are not used.  Let's remove them.
-* RpcScheduler.getPriorityLevels() 
-* getAverageResponseTime(int level)
-* setScheduler
-* MetricsProxy.numLevels

- DefaultRpcScheduler needs license header.

- averageResponseTimeInLastWindow and callCountInLastWindow need to be synchronized.

- Let's remove the unused import from Schedulable.


> Allow different Hadoop IPC Call Queue throttling policies with FCQ/BackOff
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-12916
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12916
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>            Reporter: Xiaoyu Yao
>            Assignee: Xiaoyu Yao
>         Attachments: HADOOP-12916.00.patch
>
>
> Currently back off policy from HADOOP-10597 is hard coded to base on whether call queue
is full. This ticket is open to allow flexible back off policies such as moving average of
response time in RPC calls of different priorities. 



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