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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6685) Archival Storage: Update Balancer to preserve storage type of replicas
Date Wed, 30 Jul 2014 03:46:39 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Tsz Wo Nicholas Sze updated HDFS-6685:

    Attachment: h6685_20140730.patch

Thanks Arpit for reviewing the patch.

- updates the comment at Balancer.java:357;
- fixes a bug that in utilization classification and simplifies the calculation;
- fixes a bug that getRemaining should get from a storage group but not a datanode; and
- syncs the patch with trunk.

The patch here indeed is not specific to the HDFS-6584 branch.  Let's target it to trunk.

> Archival Storage: Update Balancer to preserve storage type of replicas
> ----------------------------------------------------------------------
>                 Key: HDFS-6685
>                 URL: https://issues.apache.org/jira/browse/HDFS-6685
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: balancer
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: h6685_20140728.patch, h6685_20140729.patch, h6685_20140730.patch
> In order to maintain storage policy requirement, Balancer always moves replicas from
a storage with any type to another storage with the same type, i.e. it preserves storage type
of replicas.  In this way, Balancer does not require to know storage policy information.

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