hadoop-yarn-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Xuan Gong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1410) Handle client failover during 2 step client API's like app submission
Date Fri, 21 Feb 2014 04:20:23 GMT

    [ https://issues.apache.org/jira/browse/YARN-1410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13907937#comment-13907937
] 

Xuan Gong commented on YARN-1410:
---------------------------------

Thanks for the suggestions. But this proposal seems have disadvantages. 
Assume that we use RetryCache, we have to save the information in the store, either in hdfs
or zookeeper. First, we need to ensure all our APIs can store stuffs *asynchronously*. Second,
if we keep this proposal, when we save the RetryCache information *asynchronously*, there
will be a problem. Because the same race condition will still be there. Third, when we save
the RetryCache information *synchronously* , there will be another problem: the performance
will be decreased. 

[~bikassaha]

> Handle client failover during 2 step client API's like app submission
> ---------------------------------------------------------------------
>
>                 Key: YARN-1410
>                 URL: https://issues.apache.org/jira/browse/YARN-1410
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Bikas Saha
>            Assignee: Xuan Gong
>         Attachments: YARN-1410-outline.patch, YARN-1410.1.patch, YARN-1410.2.patch, YARN-1410.2.patch,
YARN-1410.3.patch, YARN-1410.4.patch
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> App submission involves
> 1) creating appId
> 2) using that appId to submit an ApplicationSubmissionContext to the user.
> The client may have obtained an appId from an RM, the RM may have failed over, and the
client may submit the app to the new RM.
> Since the new RM has a different notion of cluster timestamp (used to create app id)
the new RM may reject the app submission resulting in unexpected failure on the client side.
> The same may happen for other 2 step client API operations.



--
This message was sent by Atlassian JIRA
(v6.1.5#6160)

Mime
View raw message