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From "Lukas Majercak (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-13283) Percentage based Reserved Space Calculation for DataNode
Date Fri, 16 Mar 2018 20:18:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-13283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lukas Majercak updated HDFS-13283:
----------------------------------
    Attachment: HDFS-13283.001.patch

> Percentage based Reserved Space Calculation for DataNode
> --------------------------------------------------------
>
>                 Key: HDFS-13283
>                 URL: https://issues.apache.org/jira/browse/HDFS-13283
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: datanode, hdfs
>            Reporter: Lukas Majercak
>            Assignee: Lukas Majercak
>            Priority: Major
>         Attachments: HDFS-13283.000.patch, HDFS-13283.001.patch
>
>
> Currently, the only way to configure reserved disk space for non-HDFS data on a DataNode
is a constant value via {{dfs.datanode.du.reserved}}. This can be an issue in non-heterogeneous
clusters where size of DNs can differ. The proposed solution is to allow percentage based
configuration (and their combination):
>  # ABSOLUTE
>  ** based on absolute number of reserved space
>  # PERCENTAGE
>  ** based on percentage of total capacity in the storage
>  # CONSERVATIVE
>  ** calculates both of the above and takes the one that will yield more reserved space
>  # AGGRESSIVE
>  ** calculates 1. 2. and takes the one that will yield less reserved space
>  



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