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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-9194) RPC Support for QoS
Date Tue, 19 Mar 2013 16:17:18 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-9194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Junping Du updated HADOOP-9194:
-------------------------------

    Attachment: HADOOP-9194.patch

Agree with Luke that putting service level in a fixed RPC head can shorten the latency for
service level info being handled. Attached a quick patch on it.
                
> RPC Support for QoS
> -------------------
>
>                 Key: HADOOP-9194
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9194
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: ipc
>    Affects Versions: 2.0.2-alpha
>            Reporter: Luke Lu
>         Attachments: HADOOP-9194.patch
>
>
> One of the next frontiers of Hadoop performance is QoS (Quality of Service). We need
QoS support to fight the inevitable "buffer bloat" (including various queues, which are probably
necessary for throughput) in our software stack. This is important for mixed workload with
different latency and throughput requirements (e.g. OLTP vs OLAP, batch and even compaction
I/O) against the same DFS.
> Any potential bottleneck will need to be managed by QoS mechanisms, starting with RPC.

> How about adding a one byte DS (differentiated services) field (a la the 6-bit DS field
in IP header) in the RPC header to facilitate the QoS mechanisms (in separate JIRAs)? The
byte at a fixed offset (how about 0?) of the header is helpful for implementing high performance
QoS mechanisms in switches (software or hardware) and servers with minimum decoding effort.

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