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https://issues.apache.org/jira/browse/HBASE-8884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704011#comment-13704011
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Ted Yu commented on HBASE-8884:
-------------------------------
{code}
+public class SimpleRpcScheduler implements RpcServer.RpcScheduler {
{code}
Please add annotation for stability and audience
RpcScheduler can be extracted out of RpcServer, right ?
For MetricsHBaseServerWrapperImpl.java:
{code}
+ || !(this.server.getScheduler() instanceof SimpleRpcScheduler)) {
return 0;
}
- return server.callQueue.size();
+ SimpleRpcScheduler scheduler = (SimpleRpcScheduler) server.getScheduler();
+ return scheduler.callQueue.size();
{code}
Can retrieval of callQueue be declared in RpcScheduler so that we don't use the
casting above ?
> 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
> Attachments: hbase-8884.patch, hbase-8884-v2.patch,
> hbase-8884-v3.patch, hbase-8884-v4.patch, hbase-8884-v5.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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