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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4386) RPC support for large data transfers.
Date Fri, 10 Oct 2008 03:58:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638473#action_12638473
] 

Devaraj Das commented on HADOOP-4386:
-------------------------------------

We should experiment with this feature for MapReduce shuffle as well (maybe as a follow-up
jira). Shuffle has more or less the same sort of requirements.

Locking connection seems inefficient to me except only during initiation/termination. Connection
to the same server should be serialized. Did you mean some other type of blocking?

> RPC support for large data transfers.
> -------------------------------------
>
>                 Key: HADOOP-4386
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4386
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs, ipc
>            Reporter: Raghu Angadi
>
> Currently HDFS has a socket level protocol for serving HDFS data to clients. Clients
do not use RPCs to read or write data. Fundamentally there is no reason why this data transfer
 can not use RPCs.
> This jira is place holder for any porting Datanode transfers to RPC. This topic has been
discussed in varying detail many times, the latest being in the context of HADOOP-3856. There
are quite a few issues to be resolved both at API level and at implementation level. 
> We should probably copy some of the comments from HADOOP-3856 to here.

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