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https://issues.apache.org/jira/browse/HDFS-15207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17053670#comment-17053670
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Íñigo Goiri commented on HDFS-15207:
------------------------------------

Thanks [~hadoop_yangyun] for the update.
Can you number the patches with HDFS-15207.001.patch and so on?
For the lambda, instead of doing:
{code}
GenericTestUtils.waitFor(new Supplier<Boolean>() {
...
});
{code}

Do:
{code}
GenericTestUtils.waitFor(() -> {
...
});
{code}

> VolumeScanner skip to scan blocks accessed during recent scan peroid
> --------------------------------------------------------------------
>
>                 Key: HDFS-15207
>                 URL: https://issues.apache.org/jira/browse/HDFS-15207
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Yang Yun
>            Assignee: Yang Yun
>            Priority: Minor
>         Attachments: HDFS-15207.patch, HDFS-15207.patch
>
>
> Check the access time of block file to avoid scanning recently changed 
> blocks, reducing disk IO.



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