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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1363) Get / Cancel / Renew delegation token api should be non blocking
Date Sat, 22 Feb 2014 20:12:23 GMT

    [ https://issues.apache.org/jira/browse/YARN-1363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13909510#comment-13909510
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Jian He commented on YARN-1363:
-------------------------------

Haven’t looked at the patch deeply, some thoughts
- we don’t need a separate api getIsObtained in GetDelegationTokenResponse, setting the
token as null can be leveraged to indicate not yet obtained.
- what will happen if one operation is in the progress like getDelegationToken while in the
meantime another operation like cancelDelegationToken comes in ?
  Thinking whether it’s good to have a state machine per delegation token. We have 6 events
GET,CANCEL,RENEW from client, and STORED, UPDATED, REMOVED from state store; 3 states, NEW,
PROGRESS(or getting, canceling, renewing if needed) and FINISHED. We should think about all
the possible combinations.

> Get / Cancel / Renew delegation token api should be non blocking
> ----------------------------------------------------------------
>
>                 Key: YARN-1363
>                 URL: https://issues.apache.org/jira/browse/YARN-1363
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Omkar Vinit Joshi
>            Assignee: Zhijie Shen
>         Attachments: YARN-1363.1.patch, YARN-1363.2.patch, YARN-1363.3.patch, YARN-1363.4.patch,
YARN-1363.5.patch, YARN-1363.6.patch, YARN-1363.7.patch
>
>
> Today GetDelgationToken, CancelDelegationToken and RenewDelegationToken are all blocking
apis.
> * As a part of these calls we try to update RMStateStore and that may slow it down.
> * Now as we have limited number of client request handlers we may fill up client handlers
quickly.



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