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From "Varun Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2136) RMStateStore can explicitly handle store/update events when fenced
Date Wed, 13 Aug 2014 08:57:12 GMT

    [ https://issues.apache.org/jira/browse/YARN-2136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14095293#comment-14095293

Varun Saxena commented on YARN-2136:

[~jianhe], what I was talking about, was the fact that certain events may be queued up in
dispatcher event queue while this RM is in Master. But when we close the State Store while
switching to standby(on fencing), we will wait till all these events have been processed (queue
is drained). Marking the state store as FENCED may avoid these events being processed. 

That is, let us say I have 5 events in the queue and 3rd event leads to Fencing. Then, the
last 2 events will also be processed before switch to standby completes.

Your views on need for handling of this case ? 

> RMStateStore can explicitly handle store/update events when fenced
> ------------------------------------------------------------------
>                 Key: YARN-2136
>                 URL: https://issues.apache.org/jira/browse/YARN-2136
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Jian He
> RMStateStore can choose to handle/ignore store/update events upfront instead of invoking
more ZK operations if state store is at fenced state. 

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