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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 Tue, 09 Aug 2011 00:52:28 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13081343#comment-13081343
] 

Aaron T. Myers commented on HADOOP-7380:
----------------------------------------

bq. Aaron, should this change have been made in HA branch.

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.

bq. Also it would be good to add a little design document.

Sure, I can work on that.

bq. This is a fundamental change in the IPC layer. I have concerns on adding failover, retry
etc. all in one patch.

I think you're overstating the extent of this change a little bit. This patch doesn't introduce
retry - all of that was already in place. This patch augments the existing retry facility
to optionally fail over and retry on a different proxy object.

bq. It would help reviews if this is done in a smaller patches.

Certainly, I can do that in the future.

> 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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