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https://issues.apache.org/jira/browse/HDFS-16371?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

tomscut updated HDFS-16371:
---------------------------
    Description: 
Currently, the datanode can detect slow disks. See 
[HDFS-11461|https://issues.apache.org/jira/browse/HDFS-11461].

And after 
[HDFS-16311|https://issues.apache.org/jira/browse/HDFS-16311[],|http://example.com]%2C/]
 the slow disk information we collected is more accurate.

So we can exclude these slow disks according to some rules when choosing 
volume. This will prevents some slow disks from affecting the throughput of the 
whole datanode.

  was:Currently, the datanode can detect slow disks. When choosing volume, we 
can exclude these slow disks according to some rules. This will prevents some 
slow disks from affecting the throughput of the whole datanode.


> Exclude slow disks when choosing volume
> ---------------------------------------
>
>                 Key: HDFS-16371
>                 URL: https://issues.apache.org/jira/browse/HDFS-16371
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: tomscut
>            Assignee: tomscut
>            Priority: Major
>
> Currently, the datanode can detect slow disks. See 
> [HDFS-11461|https://issues.apache.org/jira/browse/HDFS-11461].
> And after 
> [HDFS-16311|https://issues.apache.org/jira/browse/HDFS-16311[],|http://example.com]%2C/]
>  the slow disk information we collected is more accurate.
> So we can exclude these slow disks according to some rules when choosing 
> volume. This will prevents some slow disks from affecting the throughput of 
> the whole datanode.



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