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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7380) Add client failover functionality to o.a.h.io.(ipc|retry)
Date Thu, 11 Aug 2011 20:20:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13083474#comment-13083474

Aaron T. Myers commented on HADOOP-7380:

I am concerned about the idempotent operation part of the patch. 
This is a significant change and it would be good to describe and discuss this.
Aaron could you please provide a short description in this Jira.

Sure, I'll write something up.

bq. Also shouldn't this be going into the HA branch?

As I've already said:

Eli seemed to think this change was sufficiently generic that it could go into trunk before
the HA branch was cut. I'm inclined to agree with him, but if you feel strongly, we could
certainly back it out of trunk and commit it only to the HA branch. I don't see much benefit
in doing so versus just addressing any concerns you have in subsequent patches, but I don't
feel strongly about that.

Please let me know if you want me to do that.

bq. As we use it with NN failover this will need to be refined.

I'm sure it will. Do you have any specific changes in mind? If so, I'd be happy to file follow-up
JIRAs to address them.

bq. Further it will require a test plan that we can develop a part of the HA branch.

A test plan for just this patch beyond the tests which were included as part of this patch?
What are you looking for out of said test plan? I certainly agree that we should come up with
a test plan for the entirety of the HA work, but I don't think that has much to do with this
specific patch.

> Add client failover functionality to o.a.h.io.(ipc|retry)
> ---------------------------------------------------------
>                 Key: HADOOP-7380
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7380
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ipc
>    Affects Versions: 0.23.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>             Fix For: 0.23.0
>         Attachments: hadoop-7380-hdfs-example.patch, hadoop-7380.0.patch, hadoop-7380.1.patch,
hadoop-7380.2.patch, hdfs-7380.3.patch
> Implementing client failover will likely require changes to {{o.a.h.io.ipc}} and/or {{o.a.h.io.retry}}.
This JIRA is to track those changes.

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