[jira] [Updated] (HDFS-9821) HDFS configuration should accept friendly time units

["Arun Suresh (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-9821?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arun Suresh updated HDFS-9821:
------------------------------
    Target Version/s: 3.1.0  (was: 2.9.0)

> HDFS configuration should accept friendly time units
> ----------------------------------------------------
>
>                 Key: HDFS-9821
>                 URL: https://issues.apache.org/jira/browse/HDFS-9821
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, namenode
>    Affects Versions: 2.8.0
>            Reporter: Arpit Agarwal
>            Assignee: Xiaobing Zhou
>
> HDFS configuration keys that define time intervals use units inconsistently (Hours, seconds, milliseconds).
> Not all keys have the unit as part of their name. Related keys may use different units e.g. {{dfs.blockreport.intervalMsec}} accepts msec while {{dfs.blockreport.initialDelay}} accepts seconds. Milliseconds is rarely useful as a time unit which makes these values hard to parse when reading config files.
> We can either
> # Let existing keys use friendly units e.g. 100ms, 60s, 5m, 1d, 6w etc. This can be done compatibly since there will be no conflict with existing valid configuration. If no suffix is specified just default to the current time unit.
> # Just deprecate the existing keys and define new ones that accept friendly units.
> We continue to use fine-grained time units (usually ms) internally in code and also accept "ms" option for tests.



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