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https://issues.apache.org/jira/browse/HDFS-14616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16883408#comment-16883408
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Wei-Chiu Chuang commented on HDFS-14616:
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If it just adds a log message you don't need a test case.
Also note that RoundRobinVolumeChoosingPolicy uses slf4j logger. So you can
consider using parameterized logging as well.
> Add the warn log when the volume available space isn't enough
> -------------------------------------------------------------
>
> Key: HDFS-14616
> URL: https://issues.apache.org/jira/browse/HDFS-14616
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 2.7.2
> Reporter: liying
> Priority: Minor
> Fix For: 2.7.3
>
> Attachments: HDFS-14616-v1.patch, HDFS-14616-v2.patch
>
>
> In the hadoop2 version, there is no warning log that the disk is not
> available when using the disk. Therefore, the datanode log cannot be used to
> check if the disk is not available ata certain time or for other problems.
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