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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9194) RPC Support for QoS
Date Wed, 13 Feb 2013 20:04:14 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13577886#comment-13577886

Sanjay Radia commented on HADOOP-9194:

bq. As Binglin pointed out on HADOOP-9151, the current protobuf RPC protocol is not amenable
to nonblocking implementations.
Luke has corrected his statement in Hadoop-9151 - the protocol does not prevent non-blocking
> 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
> 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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