[jira] [Commented] (FLUME-2642) Limit kerberos relogin attempt

["Hari Shreedharan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLUME-2642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14356190#comment-14356190 ] 

Hari Shreedharan commented on FLUME-2642:
-----------------------------------------

FYI, there is an edge case here -- where multiple threads could read the {code}lastReloginAttempt{code}, which could be > 5 mins. Now all of them could end up calling checkTGT..So every 5 mins there is a possibility that many threads could try to enter the checkTGT.. method. It is fine (the code is still thread-safe), but it is worth noting in the comments.

> Limit kerberos relogin attempt 
> -------------------------------
>
>                 Key: FLUME-2642
>                 URL: https://issues.apache.org/jira/browse/FLUME-2642
>             Project: Flume
>          Issue Type: Improvement
>    Affects Versions: v1.6.0
>            Reporter: Johny Rufus
>            Assignee: Johny Rufus
>             Fix For: v1.6.0
>
>         Attachments: FLUME-2642.patch
>
>
> UGI executor in flume authentication module attempts relogin using UserGroupInformation's checkTGTAndReloginFromKeytab().
> Since this method is synchronized, it would be better to space out the relogin attempts



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