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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9688) Add globally unique Client ID to RPC requests
Date Wed, 10 Jul 2013 19:55:49 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704976#comment-13704976
] 

Konstantin Shvachko commented on HADOOP-9688:
---------------------------------------------

Sorry for coming late to this.
The idea to use ClientId + CallId as a unique combination of the call is absolutely right.
= One question if the ClientId should be on the RPC client or DFSClient. Now both have an
id, which makes one of them redundant.
= randomUUID is not unique. Even though as Chris commented the probability of a collision
is low there are ways to generate really unique clientIds, say as we generate storageIDs for
DataNodes. Should we target that?
= The naming of the new field could be confusing. You call it uuid in the Client and clientId
in other places, if I understood it correctly.
                
> Add globally unique Client ID to RPC requests
> ---------------------------------------------
>
>                 Key: HADOOP-9688
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9688
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>            Priority: Blocker
>             Fix For: 3.0.0
>
>         Attachments: HADOOP-9688.clientId.1.patch, HADOOP-9688.clientId.patch, HADOOP-9688.patch
>
>
> This is a subtask in hadoop-common related to HDFS-4942 to add unique request ID to RPC
requests.

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