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From "Chao Shi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8884) Pluggable RpcScheduler
Date Tue, 10 Sep 2013 04:03:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762706#comment-13762706
] 

Chao Shi commented on HBASE-8884:
---------------------------------

Hi stack,

Thanks for your review comments.

bq. Shouldn't MONITORED_RPC be in Handler rather than kept as a thread local in RpcServer?
Handler could give it to the CallRunner rather than have it jump hoops to get at its stashed
instance?

The reason is to isolate logic of a RpcScheduler (implementation-specific) and RpcServer provides
(common logic shared by all RpcScheduler implementations). Putting it into Handler is OK,
but because that it has its own thread, it may not be convenient to incorporate with, for
example ThreadPoolExecutor. I'm open for any better suggestions if you have.

I think we can continue to do some refactor work to get it clean and easy for understeanding.
                
> Pluggable RpcScheduler
> ----------------------
>
>                 Key: HBASE-8884
>                 URL: https://issues.apache.org/jira/browse/HBASE-8884
>             Project: HBase
>          Issue Type: Improvement
>          Components: IPC/RPC
>            Reporter: Chao Shi
>            Assignee: Chao Shi
>             Fix For: 0.98.0
>
>         Attachments: hbase-8884.patch, hbase-8884-v2.patch, hbase-8884-v3.patch, hbase-8884-v4.patch,
hbase-8884-v5.patch, hbase-8884-v6.patch, hbase-8884-v7.patch, hbase-8884-v8.patch
>
>
> Today, the RPC scheduling mechanism is pretty simple: it execute requests in isolated
thread-pools based on their priority. In the current implementation, all normal get/put requests
are using the same pool. We'd like to add some per-user or per-region level isolation, so
that a misbehaved user/region will not saturate the thread-pool and cause DoS to others easily.
The idea is similar to FairScheduler in MR. The current scheduling code is not standalone
and is mixed with others (Connection#processRequest). The issue is the first step to extract
it to an interface, so that people are free to write and test their own implementations.
> This patch doesn't make it completely pluggable yet, as some parameters are pass from
constructor. This is because HMaster and HRegionServer both use RpcServer and they have different
thread-pool size config. Let me know if you have a solution to this.

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