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https://issues.apache.org/jira/browse/HDFS-5451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13816750#comment-13816750
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Andrew Wang commented on HDFS-5451:
-----------------------------------

Cross-posting my comment from HDFS-5394 as a follow on for here:

bq. I'd like to see the LogVerificationAppender used in 
testUncachingBlocksBeforeCachingFinishes too. This seems like it might be flaky 
though. What was wrong with the old approach that used a barrier to force 
ordering?

> add more debugging for cache rescan
> -----------------------------------
>
>                 Key: HDFS-5451
>                 URL: https://issues.apache.org/jira/browse/HDFS-5451
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, namenode
>    Affects Versions: 3.0.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Andrew Wang
>
> It would be nice to have message at DEBUG level that described all the 
> decisions we made for cache entries.  That way we could turn on this 
> debugging to get more information.  We should also store the number of bytes 
> each PBCE wanted, and the number of bytes it got, plus the number of inodes 
> it got, and output those in {{listDirectives}}.



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