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From "Xiaobing Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11038) DiskBalancer: support running multiple commands under one setup of disk balancer
Date Wed, 26 Oct 2016 20:30:58 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11038?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiaobing Zhou updated HDFS-11038:
---------------------------------
    Attachment: HDFS-11038.000.patch

> DiskBalancer: support running multiple commands under one setup of disk balancer
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-11038
>                 URL: https://issues.apache.org/jira/browse/HDFS-11038
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: balancer & mover
>            Reporter: Xiaobing Zhou
>            Assignee: Xiaobing Zhou
>         Attachments: HDFS-11038.000.patch
>
>
> Disk balancer follows/reuses one rule designed by HDFS balancer, that is, only one instance
is allowed to run at the same time. This is correct in production system to avoid any inconsistencies,
but it's not ideal to write and run unit tests. For example, it should be allowed run plan,
execute, scan commands under one setup of disk balancer. One instance rule will throw exception
by complaining 'Another instance is running'. In such a case, there's no way to do a full
life cycle tests which involves a sequence of commands.



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