[jira] [Assigned] (HADOOP-7158) Reduce RPC packet size for homogeneous arrays, such as the array responses to listStatus() and getBlockLocations()

["Matt Foley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-7158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matt Foley reassigned HADOOP-7158:
----------------------------------

    Assignee:     (was: Matt Foley)

> Reduce RPC packet size for homogeneous arrays, such as the array responses to listStatus() and getBlockLocations()
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-7158
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7158
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io
>    Affects Versions: 0.22.0
>            Reporter: Matt Foley
>            Priority: Major
>
> While commenting on HADOOP-6949, which proposes a big improvement in the RPC wire format for arrays of primitives, Konstantin Shvachko said:
> "Can/should we extend this to arrays of non-primitive types? This should benefit return types for calls like listStatus() and getBlockLocations() on a large directory."
> The improvement for primitive arrays is based on not type-labeling every element in the array, so the array in question must be strictly homogenous; it cannot have subtypes of the assignable type.  For instance, it could not be applied to heartbeat responses of DatanodeCommand[], whose array elements carry subtypes of DatanodeCommand, each of which must be type-labeled independently.  However, as Konstantin points out, it could really help lengthy response arrays for things like listStatus() and getBlockLocations().
> I will attach a prototype implementation to this Jira, for discussion.  However, since it can't be automatically applied to all arrays passing through RPC, I'll just providing the wrapper type.  By using it, a caller is asserting that the array is strictly homogeneous in the above sense.



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