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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3890) Use of CredentialProvider results in a lot of NN ops
Date Thu, 11 Jun 2015 17:16:01 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14582247#comment-14582247
] 

Keith Turner commented on ACCUMULO-3890:
----------------------------------------

I looked at the 5.part2 patch.  Is that patch relative to the part5 patch?  I am uncertain
about the correctness of returning what putIfAbsent returns, but I find the javadoc confusing.
 In the case where it does not exist in the map, will putIfAbsent return null?

> Use of CredentialProvider results in a lot of NN ops
> ----------------------------------------------------
>
>                 Key: ACCUMULO-3890
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3890
>             Project: Accumulo
>          Issue Type: Bug
>    Affects Versions: 1.6.1, 1.6.2, 1.7.0
>            Reporter: Billie Rinaldi
>            Assignee: Billie Rinaldi
>             Fix For: 1.6.3, 1.7.1, 1.8.0
>
>         Attachments: ACCUMULO-3890.1.patch, ACCUMULO-3890.2.patch, ACCUMULO-3890.3.patch,
ACCUMULO-3890.4.patch, ACCUMULO-3890.5.part2.patch, ACCUMULO-3890.5.patch
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Every time we access a sensitive property or iterate over a configuration when there
is a CredentialProvider configured, it results in NN operations (as evidenced by FSNamesystem.audit
logs).  I think that we could assume the CredentialProvider is static, read its properties
once and cache them in memory to avoid these unnecessary reads.



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