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https://issues.apache.org/jira/browse/HADOOP-9688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702321#comment-13702321
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Suresh Srinivas commented on HADOOP-9688:
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[~vinodkv] Please see why client ID needs to be unique -
https://issues.apache.org/jira/browse/HADOOP-9688?focusedCommentId=13698436&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13698436
ClientID + callID makes each request uniquely identifiable for the retry cache.
ClientID is UUID generated using -
http://docs.oracle.com/javase/6/docs/api/java/util/UUID.html
> 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
> 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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