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Posted to common-issues@hadoop.apache.org by "Luke Lu (JIRA)" <ji...@apache.org> on 2013/01/10 01:08:12 UTC

[jira] [Created] (HADOOP-9194) RPC Support for QoS

Luke Lu created HADOOP-9194:
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             Summary: 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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