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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10433) Make retry also works well for Async DFS
Date Tue, 31 May 2016 23:18:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15308833#comment-15308833
] 

Tsz Wo Nicholas Sze commented on HDFS-10433:
--------------------------------------------

Thanks Jing.  I will commit this shortly and file a follow up JIRA.

> Make retry also works well for Async DFS
> ----------------------------------------
>
>                 Key: HDFS-10433
>                 URL: https://issues.apache.org/jira/browse/HDFS-10433
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs
>            Reporter: Xiaobing Zhou
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: h10433_20160524.patch, h10433_20160525.patch, h10433_20160525b.patch,
h10433_20160527.patch, h10433_20160528.patch, h10433_20160528c.patch
>
>
> In current Async DFS implementation, file system calls are invoked and returns Future<?>
immediately to clients. Clients call Future#get to retrieve final results. Future#get internally
invokes a chain of callbacks residing in ClientNamenodeProtocolTranslatorPB, ProtobufRpcEngine
and ipc.Client. The callback path bypasses the original retry layer/logic designed for synchronous
DFS. This proposes refactoring to make retry also works for Async DFS.



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