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https://issues.apache.org/jira/browse/HDFS-5591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13950033#comment-13950033
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Aaron T. Myers commented on HDFS-5591:
--------------------------------------

bq. One question, the automatic patch-testing tool called out that there is no 
@author tag. Is that ok?

Note that it said "*+1*, this patch has no @author tags." The patch test script 
is trying to ensure that there are _no_ author tags in the patch, so you're 
good on this front.

> Checkpointing should use monotonic time when calculating period
> ---------------------------------------------------------------
>
>                 Key: HDFS-5591
>                 URL: https://issues.apache.org/jira/browse/HDFS-5591
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.2.0
>            Reporter: Andrew Wang
>            Assignee: Charles Lamb
>            Priority: Minor
>              Labels: newbie
>         Attachments: HDFS-5591.001.patch, HDFS-5591.002.patch, 
> HDFS-5591.003.patch
>
>
> Both StandbyCheckpointer and SecondaryNameNode use {{Time.now}} rather than 
> {{Time.monotonicNow}} to calculate how long it's been since the last 
> checkpoint. This can lead to issues when the system time is changed.



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