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https://issues.apache.org/jira/browse/HDFS-14403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16819104#comment-16819104
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Erik Krogen commented on HDFS-14403:
------------------------------------
{quote}
I initially shorted out the update on queue insertion but later figured it was
ok to charge the user a tiny amount since readers can reject the call (call
queue overflow, etc) and that load isn't "free" especially if the abusive user
is flooding the NN.
{quote}
Fine with me, though I think we need to document it to avoid confusion later.
[~linyiqun], I agree with your proposal. [~cgregori] and I also discussed on
our side that having the cost calculation logic in a more pluggable location
would be better. [~daryn], I think we can try to take this up on our side since
it sounds like that's alright with you. We can port your patch to trunk and
combine some ideas from our patch on top of yours, such as the {{CostProvider}}
interface. [~cgregori], are you OK with taking this up?
> Cost-Based RPC FairCallQueue
> ----------------------------
>
> Key: HDFS-14403
> URL: https://issues.apache.org/jira/browse/HDFS-14403
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: ipc, namenode
> Reporter: Erik Krogen
> Assignee: Christopher Gregorian
> Priority: Major
> Labels: qos, rpc
> Attachments: CostBasedFairCallQueueDesign_v0.pdf,
> HDFS-14403.001.patch, HDFS-14403.002.patch, HDFS-14403.003.patch,
> HDFS-14403.branch-2.8.patch
>
>
> HADOOP-15016 initially described extensions to the Hadoop FairCallQueue
> encompassing both cost-based analysis of incoming RPCs, as well as support
> for reservations of RPC capacity for system/platform users. This JIRA intends
> to track the former, as HADOOP-15016 was repurposed to more specifically
> focus on the reservation portion of the work.
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