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From "Dmytro Sen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AMBARI-14524) HDFS Recommendation: dfs.datanode.du.reserved should be set to 10%-15% of volume size
Date Wed, 30 Dec 2015 13:03:49 GMT

     [ https://issues.apache.org/jira/browse/AMBARI-14524?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dmytro Sen updated AMBARI-14524:
--------------------------------
    Attachment: AMBARI-14524.patch

> HDFS Recommendation: dfs.datanode.du.reserved should be set to 10%-15% of volume size
> -------------------------------------------------------------------------------------
>
>                 Key: AMBARI-14524
>                 URL: https://issues.apache.org/jira/browse/AMBARI-14524
>             Project: Ambari
>          Issue Type: Bug
>          Components: stacks
>    Affects Versions: 2.1.0
>            Reporter: Dmytro Sen
>            Assignee: Dmytro Sen
>            Priority: Critical
>             Fix For: 2.4.0
>
>         Attachments: AMBARI-14524.patch
>
>
> PROBLEM: Ambari should give recommendations on this setting: dfs.datanode.du.reserved
> The default is 1GB and that is too low for a lot of our production customers. If this
is too low and the space on the datanode fills up, the nodemanagers will start failing the
health checks and we get into a bad state with not enough nodemanagers being up. At this point
the admin tries to run the balancer and hope that it will balance very quickly.
> There should be a recommendation on this value based on the disk space available in the
datanode volume. In addition, if the user sets it too low there should be a warning saying
this will cause problems if enough buffer is not kept.



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